HVAC Journal Database

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Aswaney, Mahesh Introducing: New Perishable Cargo Centre at Mumbai International Airport 2003 January-March A modern refrigerated cargo centre capable of handling storage of flowers, fresh fruits & vegetables, while they are in transit at Mumbai airport en route to the Middle East & Europe, has just been completed. [ top]
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Bahnfleth, W P Filtration of Airborne Microorganisms 2002 July-September The authors explain the selection and evaluation of air filters for hospital application. Bajaj, Samta HVAC Design Criteria for Isolation Rooms 2002 July-September With the resurgence of communicable diseases such as TB, AIDS and the need to protect bone marrow or organ transplant patients, the need for isolation rooms is growing. Balakrishna, Suresh Precision Air Conditioning 2002 January - March In simple language, the article explains why a comfort air conditioner is unsuitable for removing the high sensible heat generated in a telecom or server room. Bapat, Sandeep Refrigeration for Carbonated Beverages 2003 April-June What makes one soft drink frizzier or more bubbly than another? Better carbonation & better refrigeration! The author explains how soft drinks are manufactured, how refrigeration capacity is calculated & types of systems used. Bartley, Judene New Ventilation Guidelines for Health Care Facilities 2002 July-September The 2001 edition is the latest revision in the "Guidelines for Design and Construction of Hospital and Health Care Facilities" in USA. Changes pertaining to HVAC are summarized in the article. Bauman, Fred Outlook for Under Floor Air Distribution 2002 April-June Some designers are predicting that 35% of new office buildings in the USA will have raised floors and some form of under floor air distribution by 2004. There systems offer several advantages over conventional overhead distribution systems and these are explained, along with possible drawbacks to more rapid growth. Bhaduri, A The Use of Variable Frequency Drives in Existing HVAC Installations 2001 July-September How a VFD works and how it can save on energy bills in HVAC systems is clear explained. Existing HVAC systems, installed during the days when energy was cheap and imported controls were very expensive and difficult to import, are the obvious target for maximum power savings. Bharucha, Rumi H How Not to Design, Install & Maintain AC Systems for OTs 2002 July-September A surgeon's skill in an OT can often be forgotten if the IAQ in the OT is poor. The article tells you why. Bhattacharjee, B Historical Developments in Air Cleaning & Clean Rooms 2003 October - December Where we were & where we are today, the developments along the way that have helped us to get there are clearly explained. The future calls for more work in the formulation of local codes & standards. Bhetasiwala, Yusuf Low Energy 100%-Outside-Air Dryer 2001 April-June There are many ways of drying air for different applications. This article covers several commonly used methods and presents a different approach which is claimed to be extremely energy efficient. Readings from an actual installation are presented. Brusha, Ronald Condensate Traps for Cooling Coils 2002 October - December There are widespread misconceptions about how condensate traps work and how to properly size them. Simple, inexpensive details can make them much easier to inspect and maintain. [ top]
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Coad, William J. VAV Systems 2003 July-September Starting with the evolution of VAV boxes, the author explains his recommendations for treating ventilation air by means of a seperate AHU. Chin, Lawrence Alternatives for R-22 in Split System Air Conditioners 2000 April-June With R-22 eventually being phased out under the Montreal Protocol alternative refrigerants must be tried and tested. Here are some answers. Chowdhury, Pranab Stairwell Pressurization 1999 April-June The principles and practice of smoke control are explained in detail in an effort to demystify the subject and emphasize the importance of stairwell pressurization in tall buildings. HVAC Design Criteria for Isolation Rooms 2002 July-September With the resurgence of communicable diseases such as TB, AIDS and the need to protect bone marrow or organ transplant patients, the need for isolation rooms is growing. [ top]
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Dalal, Dewang How Not to Design, Install & Maintain AC Systems for OTs 2002 July-September A surgeon's skill in an OT can often be forgotten if the IAQ in the OT is poor. The article tells you why. Danfoss Industries Pvt. Ltd. Scroll Compressors for AC & R Applications 2000 April-June Hermetic scrolls are slowly replacing hermetic recips in residential and commercial split air conditioners and packaged chillers. Find out why. Das Gupta, Avijit Heat Pump for Domestic and Light Commercial Markets 2001 January - March Widely used in North America for domestic and light commercial applications, heat pumps are relatively new to India. They provide a low cost source of hot water along with air conditioning and by modifying a standard room air conditioner; the heat pump can come within the reach of many home-owners. Dastur, R K HVAC Systems for Theatres, Auditoriums & Cinema Halls 2003 January - March Noise and noise control in HVAC systems are explained in great detail & the various figures & tables provided, are an excellent source of reference for the experienced engineer, who can then avoid many pitfalls, when it comes to preparing drawing layouts & installing equipment. Datey, Dilip A Primer on Pumps for HVAC 2001 January - March Pumps are often taken for granted and many engineers are not familiar with different types available basic pump laws and how energy can be saved by proper selection. Desai, Arvind Fire and Smoke Dampers 1999 April-June Application guidelines, construction standards, testing facilities, installation practices and actuator selection are explained in this article in an effort to initiate action by Fire Department to codify best practices into a detailed standard. Dr. Desai, Vivek Planning for HVAC Systems in Hospitals in India 2002 July - September An expert in hospital planning writes about the condition of hospitals in India and the need to educate entrepreneur doctors planning to construct new hospitals. Deshpande, Shankar Semi-Hermetic Reciprocating Compressors 2000 April-June This workhorse of the industry is gaining acceptance over the open type compressor as reliable hermetic motors are now being manufactured in India. Dharap, Arun Inlet Air cooling for Gas turbines 1999 October-December Captive power plants for large industrial undertakings frequently use natural gas or naphtha for power generation. Air required for combustion in the turbine, if cooled by refrigeration can help improve efficiency. Evaluating and selecting the right type of refrigerating plant is the topic of this article by engineers with practical application experience on the subject. Dharkar, Pankaj Air Conditioning of Multiplexes 2003 January - March Multiplexes are the latest craze in the country and this author has designed a large number of them. Peculiarities of these complexes & how to design an efficient HVAC system to meet such needs are explained. How to go about collecting return air, under the seats, is well-illustrated. [ top]
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Engelking, Stephan Use of Suction - Gas Cooled and Direct Air-cooled Semi Hermetic Compressors 2000 April-June The new design direct air-cooled compressor finds application at low evaporating temperatures with low compressor discharge temperatures. Erlandson, Kjell An Integrated Approach to Cold Store Loading Bay Design 2000 October-December The analytical approach to loading bay design and how it can help reduce operating costs and problems in modern cold storages will be useful to owners of existing cold stores as well as designers of new cold stores in India. [ top]
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Fiorino, Donald Achieving High Chilled-water Delta Ts 2002 October-December The article recommends practical methods for achieving 8.3ºC (15ºF) or greater chilled-water differentials in variable flow hydronic cooling systems. Selection of adequate size cooling coils plays an important part in achieving high Delta Ts. [ top]
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Garde, A S Introducing: New Perishable Cargo Centre at Mumbai International Airport 2003 January-March A modern refrigerated cargo centre capable of handling storage of flowers, fresh fruits & vegetables, while they are in transit at Mumbai airport en route to the Middle East & Europe, has just been completed. Ghanwat, Anil Inlet Air cooling for Gas turbines 1999 October-December Captive power plants for large industrial undertakings frequently use natural gas or naphtha for power generation. Air required for combustion in the turbine, if cooled by refrigeration can help improve efficiency. Evaluating and selecting the right type of refrigerating plant is the topic of this article by engineers with practical application experience on the subject. Gharote, Jagdish Ducting - The New Frontier 1999 January-March What factory made ductwork can accomplish and its advantages over hand made ductwork is explained by entrepreneur and owner of India's first automated duct fabrication shop. Gidwani, Pratap Ducting - The New Frontier 1999 January-March What factory made ductwork can accomplish and its advantages over hand made ductwork is explained by entrepreneur and owner of India's first automated duct fabrication shop. Achievig Ducting Excellence 2003 July-September Based on his practical field experience, the author suggests some recommendations for raising the general standard of ductwork in India. Groll, Eckhard A Saving Energy in Refrigerated Warehouses 2001 April-June Most engineers may not consider the possibility of reducing electricity bills for refrigerated warehouses by improving the efficiency of the electric systems of the plants. However, improving the power factor is an important method for increased efficiency. Gupta, Nirmal C Air-Cooled Chillers: Myths & Facts 2003 October-December Air is abundant, clkean water is becoming scarce. Air-coll chillers were born out of need for massive air conditioning needs in the Middle East. They are simple to operate & their power consumption is not as high as you imagine. Gupta, P Impact of Cooling Tower Blade Modification on Energy Consumption 2001 October-December Written by an expert on maintenance responsible for 95% uptime of the Nuclear Science Centre facility, the article explains how changing the cooling tower fan blades not only saved on energy consumption but also on maintenance cost. GmbH Stulz Precision or Comfort Air Conditioning 2002 January-March In simple language, the article explains why a comfort air conditioner is unsuitable for removing the high sensible heat generated in a telecom or server room. [ top]
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Dr. Hundy, Guy Dealing with Glide Refrigerants 2003 October-December With the phase out of CFCs, a new breed of refrigerants has emerged. The term "glide" as it applies to refrigerants is explained along with standard rating conditions for compressors using such refrigerants. Hwa, Lek Siang Hospital HVAC Design : A Challenge for IAQ, Energy Recovery and System Reliability 2002 July-September Written from the perspective of consultants and based on the authors' experience from a number of hospital projects completed in Singapore, the article provides an overview of hospital HVAC design. [ top]
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Iyengar, Satish Air Conditioning of Large Call Centres 2002 January-March Understanding the functioning of a Call centre and its special needs will help in designing the critical air conditioning requirements. Iyer, Venkat Electrical Switchgear And Controlgear 1998 July-September The HVACR engineer needs to be familiar with basics of switchgear and controlgear. How and where to use these devices is explained to the ACR engineer in this article. [ top]
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Jaiswal, S K Engineered Filter Frames for Clean Rooms 2001 April-June As a rule, filter frames for clean room application do not receive the care in design and manufacture that they deserve. The authors explain then view point, show the design improvements possible and furnish test readings from a prototype clean room tent equipped with their engineered frame. Jayaraman, B Thermodynamic Properties of Air Water Mixtures (-100 to 100 deg C and 50 to 5000 kPa) 1999 April-June A compilation of formulae and data used to construct psychrometric charts for absolute pressures of 50 kPa, 101.325 kPa (14.7 kPa) and 1000 kPa that can be useful for vacuum drying and compressed air drying applications. Jhangiani, Hiru M Designing and Installing Large Cold Stores using Prefab Insulated Panels 2002 April-June With the increasing emphasis on horticulture, processed foods and logistics of distribution thee is a growing demand for larger cold stores with shorter completion periods. This can be met by use of prefab insulated panels and factory built condensing units. Several issues that are relevant to modern designs of such cold stores are explained. Jog, Krishna Trouble Shooting ACR Systems 1998 October-December An experienced engineer recalls some of the problem jobs he was involved in sorting out, the importance of field visits and the need to probe all aspects of equipment selection and design before arriving at a conclusion. [ top]
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Kakkar, Rajeev Effect of Solar Shading on Windows 2000 January-March Solar heat gain from windows can be effectively reduced by external shading devices such as chajjas and vertical fins. The equations for calculating the shading effect by such devices can be quite complex. This article attempts to simplify such calculations for peak heat gain during May at 4 pm for latitudes 10 deg N, 20 deg N and 30 deg N which cover almost the entire Indian sub-continent. Kohli, V M HVAC - its Relevance to Telecommunication 2002 January-March The growth of telecommunication in India and the advent of Electronic exchanges has changed the type of air conditioning equipment specified and used by BSNL today. Kowalski, W J Filtration of Airborne Microorganisms 2002 July-September The authors explain the selection and evaluation of air filters for hospital application. Kriplani, Rita Central vs Floor-by-Floor AC for Office Buildings 1999 January-March Pros and cons of central chilled water as well as packaged air conditioning systems are explained and main aspects of each type discussed at length. That each type has a place of its own and often both types are required in the same building is clearly brought out. Kulkarni, P B Engineered Filter Frames for Clean Rooms 2001 April-June As a rule, filter frames for clean room application do not receive the care in design and manufacture that they deserve. The authors explain then view point, show the design improvements possible and furnish test readings from a prototype clean room tent equipped with their engineered frame. [ top]
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Lalvani, Ramesh Ducting - The New Frontier 1999 January-March What factory made ductwork can accomplish and its advantages over hand made ductwork is explained by entrepreneur and owner of India's first automated duct fabrication shop. Lulla, M H DX Air Conditioning for Office Buildings 1999 January-March The basics of direct refrigerant expansion and the advantages of such a system, both central and unitary, for office air conditioning are discussed in detail with examples of buildings using such systems. One Building Experiences Three Types of Chillers 2001 October-December A forty year old office building installs a new set of screw chillers with allied pump work with only one working day shutdown of cooling. Advance planning and a dedicated team of workers helps to achieve results cutting down inconvenience and saving energy costs. Air Conditioning of Auditoriums 2003 January-March Armed with practical experience of designing air conditioning systems for 40-odd auditoriums, this well-known consultant from Chennai guides young engineers on the basics of design for this application and gives examples of a few auditoriums where he has used, either ducted-split ACs or central plants. Wet Ceilings 2003 July-September Almost unbelievable but true, this rael-life experience drives home the importance of proper design of air distribution systems. Luther, Kennath R Variable volume Pumping Fundamentals 1999 July-September Primary-secondary pumping used in large, high pressure drop distribution systems such as airports, campuses, large research institutes (BARC Mumbai or CAT Indore) help cut pumping costs in HVAC systems. Applying Variable Volume Pumping 1999 October-December This is a continuation of "Variable Volume Pumping fundamentals" in the July-Sept 1999 issue by the same author. Primary - secondary pumping helps cut pumping costs in large HVAC chilled water distribution systems. [ top]
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Maheshwari, Anil The Facts about Fire & Smoke Dampers 2003 July-September Correct applications & stringent testing standards are essential, if fire & smoke dampers are to perform their function during a fire. This article gives all the facts on these issues. Malhotra, Sunil An Industrial Designer's Viewpoint 1999 January-March How can an industrial designer contribute to a better air conditioner or packaged chiller? Is there scope for his involvement in our industry? Malhotra explains how and the editors photographs show the need for better designs. Marathe, Amrit B Selecting Cooling Coils without Proprietary Software 2002 October - December Using a computer and a software program to select cooling coils is simple. But if you don't have access to such software you can still make a reliable selection with the help of this article. Mathur, Atul Air Conditioning Design for Data Processing Centres 2002 January-March Air conditioning system design for DPCs and the increasingly common requirements for Six Stigma system availability is creating a demand for greater engineering sophistication in he total design of the facility. A Systematic Approach for reviewing the Selections of Ch. W. Fan Coil Units 2002 April-June The important issues that must be nailed down before approving the selection and performance of fan coil units are clearly brought out, so that capacity problems in the future are avoided. Hospital HVAC Design : A Challenge for IAQ, Energy Recovery and System Reliability 2002 July-September Written from the perspective of consultants and based on the authors' experience from a number of hospital projects completed in Singapore, the article provides an overview of hospital HVAC design. Investigation of Condensation Problem on Chilled Water Piping 2002 October-December Chilled water pipes are insulated for energy efficiency, avoiding heat gain to the chilled water and preventing surface condensation. In humid climates, condensation problems can occur if the specs are not right and insulation is not installed properly. This article reviews a case where such problems did occur. Project Management : The Pitfalls 2003 January-March A large population of air conditioning professionals is involved in project management. While all project teams set out to finish the project in time, within the budgeted cost & required quality stanndards, not every team succeeds. All the pitfalls are very clearly brought out by the author. Mehta, Dharmesh Low Energy 100%-Outside-Air Dryer 2001 April-June There are many ways of drying air for different applications. This article covers several commonly used methods and presents a different approach which is claimed to be extremely energy efficient. Readings from an actual installation are presented. Meyer, Craig W Avoid Legionellosis Lawsuits over Cooling Towers 2003 April-June Controlling Legionella in cooling towers can prevent the disease Legionellosis, which is common in the USA & the developed world. How to take care of your cooling tower is explained. Moult, Rob VAV Systems for Office Buildings 1999 January-March While variable air volume systems have been around for a long time in the USA they are slowly being accepted in India for the new breed of office buildings being planned and constructed in all major cities. Control Strategies for VAV Air Handling Units 1999 April-June This is the second in a series of articles to help the design professional familiar with constant air volume air conditioning to understand VAV systems better. Control of Cooling - only VAV boxes 1999 July-September Third in a series of articles to help the design professional familiar with constant air volume air conditioning to understand VAV systems better. Indoor Air Quality Control of VAV AHUs. 1999 October-December Fourth in a series of articles to help the design professional familiar with constant volume air conditioning to understand VAV systems better. Today, IAQ is a very important issue that is a part of the design of any HVAC system. Integrating Chillers and Building Automation Systems 2000 October-December This article attempts to describe the type of information that can be shared between chillers and the BAS and the benefits to the building manager if this integration capability is fully implemented. Mukherjee, Hirak A New Design Rotary Compressor for Mobile AC & R Applications 2001 April-June Thee are several types of rotary compressors for mobile applications. The OVR type which was partly developed in India, is currently under manufacture in Pune for the world market. Unique features of the OVR compressor and it's comparative performance with other brands in tests carried out by an independent company are furnished. Dr. Munjal, M L Selection, Design and Fabrication of Quieter Fans for HVAC Systems 2000 July-September The major source of noise in heating, ventilating and air conditioning systems are fans and blowers of air handling units. Proper selection and application can help eliminate this problem. Selection criteria for different types of fans and use of sound attenuators is explained. Murphy, John Dehumidification Performance of HVAC Systems 2003 April-June The importance of maintaining relative humidity below 60% in comfort applications & different ways of achieving this are clearly explained. Murthy, S K Hotels & Air Conditioning: Some aspects 1998 July-September Mumbai, the commercial capital of India is in need of hotel rooms. With several new hotels under construction or in the planning stage, this article presents some aspects of HVAC systems in hotels. [ top]
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Nadeem, M Evaluation of Overall Chiller Performance Characteristics 2001 July-September With the variety of packaged chillers available today, the end user or consultant has a difficult job to perform in deciding which type to specify for his HVAC project. Here is one consultant who guides you through the various factory involved in evaluating chiller performance, particularly for a hotel project. The methodology can be applied to any other type of building as well. Nadkarny, Pradeep Energy Efficient HVAC Systems for Health Care Facilities 2002 July-September Minimizing energy costs during the design stage of an HVAC system can help hospitals become more affordable. Nagabhushan, Rashmi Sustenance of Clean Room Conditions 2001 October-December Proper design and installation of a clean room facility is an important first step but equally important is staff training in clean-work habits, strict discipline and timely maintenance, without which design conditions can deteriorate rapidly. Several case histories of failed installations are brought out. Ninomura, Paul New Ventilation Guidelines for Health Care Facilities 2002 July-September The 2001 edition is the latest revision in the "Guidelines for Design and Construction of Hospital and Health Care Facilities" in USA. Changes pertaining to HVAC are summarized in the article. [ top]
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Paranjpey, Ramesh Use of Ammonia for Air Conditioning Applications 1999 April-june Ammonia has been used for refrigeration applications in food preservation for a long time but its use in air conditioning plants is fairly new. Why its use in such applications should be increased is well brought out in this article. Cooling Coils Factors that influence design & selection 2003 April-june In simple language, the author explains the several factors that good design & careful selection of a common cooling coil. With a variety of tube sizes, fin spacings & materials available today, the application engineer needs to be well informed. Pahwa, Deepak Indoor Air Quality (IAQ) - Issues at Stake 2001 January-March What is IAQ why we must focus on it and how we can reduce or control the contaminants in the air that we breathe, whether at home or in an office are clearly explained by the author. Pearson, Andy New Developments Industrial Refrigeration 2001 July-September Sitting and working on the other side of the world, the author recounts his company's experience with Carbon Dioxide as a refrigerant in a large, low temperature installation in a food plant. The advantages and disadvantages of CO2 over Ammonia which is the most commonly used refrigerant in industrial refrigeration in Europe today, are explained. Pearson, S F Ammonia Low Pressure Recievers 2001 January-March This reprint of a paper presented to the Institute of Refrigeration Engineers in the U.K., explains the working of compact Ammonia refrigeration system using a low pressure reciever & how successful its application has been for cold stores in the U.K. Petitjean, Robert The Need for Balancing Valves in a Chilled Water System 1999 October-December Balancing valves are an essential part of any HVAC chilled water distribution system and help the eventual user realize the full potential of a well designed, properly installed and carefully selected system that satisfies the comfort need of the occupants in all areas. Hydronic Balancing - a necessity for Good Control and Improved HVAC Performance 2000 January-March Indicating design flows on drawings is not sufficient to obtain such flows in actual practice. Installing balancing valves and carrying out hydronic balancing enables the required flows to be obtained, compensating for over-sizing and justifying the investments made. Hydronic Balancing and Stabilization of the Differential Pressures. 2000 April-june Flow Compatibility at System Interfaces 2000 July-September Production of hot/chilled water and its distribution in heating / cooling coils must be balanced to avoid oversizing. How balancing can help is explained in this last article of a three part series. [ top]
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Raha, S CO₂ / NH₃ Cascade Refrigeration Systems 2002 October-December Why such systems are clearly superior to conventional two-stage ammonia systems for low temperature (around - 40ºC) applications in food processing and similar industries are clearly explained by the author. Ramsey, Melvin A Pills for sick Duct Systems 2003 July-September A few fundamentals of good duct design & practical tips on air distribution are explained in this simple article. Dr. Rane, Milind Opportunities For Energy Conservation In RAC 1998 July-September Reducing the effects of increasing energy costs, inadequate electricity generation and distribution infrastructure and increasing demand for refrigeration and air conditioning (RAC) are the problems, which can be reduced by the HVACR community. Heat Pump for Domestic and Light Commercial Markets 2001 January - March Widely used in North America for domestic and light commercial applications, heat pumps are relatively new to India. They provide a low cost source of hot water along with air conditioning and by modifying a standard room air conditioner; the heat pump can come within the reach of many home-owners. Rao, N Increasing Productivity in HVAC Layout Work 1999 October-December HVAC system designers and contractors can increasingly rely on computerization and smarter software to speed up design and fabrication of ductwork, calculations of sheet metal area required and many other aspects of HVAC system design. Rao, Staish Energy Efficient HVAC Systems for Health Care Facilities 2002 July-September Minimizing energy costs during the design stage of an HVAC system can help hospitals become more affordable. Ravindra, D Capacity and Performance Testing of Packaged Air Conditioners 1998 October-December With increasing competition manufacturers of packaged and split air conditioners need to install test facilities to ensure their units perform as specified - no less but may be more. Hermetic Motors 1999 July-September Commonly used in hermetic and semi-hermetic compressors, readers will learn how hermetic motors differ from their air-cooled cousins - the standard motor. High-Performance Heat-Transfer Tubes for AC&R Applications 2000 October-December Reasons why such tubes were developed, the manner in which they perform, the variety available, manufacturer's names and in what type of AC&R heat exchangers they are best used in, are all explained in this practical article. Air-Cooled Condensers 2001 July-September As water becomes scarcer and cities clamp down on usage for air conditioning plants, air cooled condensers are taking over. The fundamentals of design, selection, manufacturing, capacity control and maintenance are among the various items explained by the author. Renz, Hermann Design and Application of Small Screw Compressors - Part 1 2000 April-June Small highly efficient screw compressors are challenging reciprocating machines on their traditional home turf in commercial and light industrial markets. Design and application of Small Screw Compressors - Part 2 2000 July-September Parallel operation of small screw compressors and comparison of performance / operating costs with reciprocating systems is shown. Concluding part of a two part series. Robertson, Richard Integrating Chillers and Building Automation Systems 2000 October-December This article attempts to describe the type of information that can be shared between chillers and the BAS and the benefits to the building manager if this integration capability is fully implemented. [ top]
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Sarda, Dilip Refrigeration for Ice Cream Manufacturing 1999 July-September Ice cream involves refrigeration at many stages - in its manufacturing, hardening, transporting, storing and finally retailing. The author takes you through the various stages and shows how refrigeration loads are calculated. Saraiya, G S Air Conditioning of Pharmaceutical Plants 1998 October-December This article explains why manufacture of pharmaceuticals must be carried out in carefully designed facilities with a clean aseptic environment, controlled relative humidity and comfortable temperature. Dust Control in Pharma Industries 2000 July-September Tablet manufacturing presents the biggest challenge to the ventilation engineer in controlling dust and safeguarding worker's health. Design of dust extraction systems, hood design and calculation of exhaust air volumes are all documented. Schneider, Raymond K Designing Clean Room HVAC Systems 2001 October-December Written by a clean room consultant, the author simplifies the presentation by dividing clean rooms into three levels - stringent, intermediate and less stringent. The concept of filter efficiency by the MPPS method is brought out and practical tips given in air flow design and makeup air. Sengupta, S K Remote Nodes for Telecommunication, Selecting the ideal air conditioning sysytem 2003 April-June One would think that air conditioning a 9m2 room would be very simple. Install a room AC & be done with it. But when that room houses electronic equipment for mobile phones, it is no longer a simple job & the author tells you why. Shah, Surendra Evaporative Pre-cooling for Air Cooled Condensers 1998 October-December A simple idea, imaginatively applied and how it can save both in initial and operating cost. Shahani, Hamish Eliminating Volatile Organic Compounds 2003 October-December Clean room contaminants in the form of volatile organic compounds (VOCs) need to be controlled in certain applications, including hospital operating suites. The author throws some light on this obscure subject. Shankar, Pradeep Air Conditioning of Clean Rooms for Pharmaceutical Plants 2001 October-December From definition, classification and type of clean rooms the article leads you through to building design, are conditioning system design, air handling system design, duct design, air flow patterns and air filter selection Sharma, Seemant VSD for Chillers 2001 July-September VSDs on centrifugal chillers are new to the Indian market but very well accepted internationally. Chillers with a variable speed drive and inlet guide vane control can together achieve optimum chiller performance. Simha, R.V. Cold Air Distribution Systems 2002 April-June A detailed study of such systems brings out the several benefits that can accrue from their use in commercial and office buildings. Reduced air flow rates translate into smaller ducts and AHUs, increased ceiling heights and lower energy costs. High-rise coils result in smaller piping and pumps. Overall savings in initial and operating costs are a result. Ductwork Leakage & Leak Testing (Part 1 of 2) 2003 July-September If you dont know how much your ductwork leaks there is very little incentive to improve fabrication practices. International leakage norms are explained in Part I. Ductwork Leakage & Leak Testing (Part2 of 2) 2003 October-December If you dont know how much your ductwork leaks, there is very little incentive to improve fabrication practices. Part 2 explains the nitty-gritty of leakage measurement & calculations. Simpson, Mark Air Conditioning Design for Data Processing Centres 2002 January-March Air conditioning system design for DPCs and the increasingly common requirements for Six Sigma system availability is creating a demand for greater engineering sophistication in he total design of the facility. Sinha, Sudhir K HVAC Systems for Theatres, Auditoriums & Cinema Halls 2003 January-March Noise and noise control in HVAC systems are explained in great detail & the various figures & tables provided, are an excellent source of reference for the experienced engineer, who can then avoid many pitfalls, when it comes to preparing drawing layouts & installing equipment. Spatz, Mark Alternatives for R-22 in split system air conditioners 2000 April-June With R-22 eventually being phased out under the Montreal Protocol alternative refrigerants must be tried and tested. Here are some answers. Stegmann, Rudy Practical Guide - Low Temperature Refrigeration 2000 July-September An overview of the design problems associated with low temperature refrigeration systems in the range of - 50 ºC to - 100ºC (-58ºF to - 148ºF) Stone, Richard Investigation of Condensation Problem on Chilled Water Piping 2002 October-December Chilled water pipes are insulated for energy efficiency, avoiding heat gain to the chilled water and preventing surface condensation. In humid climates, condensation problems can occur if the specs are not right and insulation is not installed properly. This article reviews a case where such problems did occur. Streifel, Andrew J Health-Care IAQ : Guidance for Infection Control 2001 April-June Making IAQ a top priority in the health-care industry starts with building design, Infection-Control risk assessment (ICRA) is a tool that does exactly that. ICRA, which is outlined in this article, helps identify the areas that are at greatest risk of airborne infectious agents. Surange, Arvind An Overview of Cold Storage Practise in India 1998 October-December Changes that have occurred in the design and installation of cold storages in India over the last two decades, the increasing popularity of PUF prefab panel construction and why this is not more commonly used is explained. Sze, George Hospital HVAC Design : A Challenge for IAQ, Energy Recovery and System Reliability 2002 July-September Written from the perspective of consultants and based on the authors' experience from a number of hospital projects completed in Singapore, the article provides an overview of hospital HVAC design. [ top]
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Uchil, Rohit Air Conditioning of Leisure Centres 2001 January-March Bowling Alleys, Fast Food outlets, Shopping Centre and similar facilities are becoming increasingly common and designing their air conditioning systems calls for practical experience and background information which this article attempts to provide. [ top]
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Venkatraman, S Underfloor Air Conditioning 2002 January-March The challenge thrown by IBM to Ralph Liebert in the early 60s resulted in the modern precision air conditioner. Venugopal, Manoj Semi-Hermetic Reciprocating Compressors 2000 April-June This workhorse of the industry is gaining acceptance over the open type compressor as reliable hermetic motors are now being manufactured in India. [ top]
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Webster, Tom Outlook for Under Floor Air Distribution 2002 April-June Some designers are predicting that 35% of new office buildings in the USA will have raised floors and some form of under floor air distribution by 2004. There systems offer several advantages over conventional overhead distribution systems and these are explained, along with possible drawbacks to more rapid growth. Wilkinson, Ronald J The Market for Duct Systems: What's New 2003 July-September Concerns for improving IAQ are bringing about changes in old fashioned ductwork. [ top]
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Young, David Eurovent Certification of Air-Cooled Heat Exchangers 2000 January-March The author, based in England, explains the confusion arising out of different interpretations of the term "Temperature Difference" (TD) as applied to Unit Coolers used in cold storages in Europe and how the problems have been resolved amongst manufacturers with a common system of certification. Stainless Steel Tube Coils for Use with Ammonia 2000 October-December The widespread use of SS tube coils in Ammonia refrigeration systems for cold storages and blast freezers in Europe and its advantages over traditional galvanized steel coils used in India are clearly explained by the Author who has worked in England for long years. [ top]
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Zhang, Jianyi Saving Energy in Refrigerated Warehouses 2001 April-June Most engineers may not consider the possibility of reducing electricity bills for refrigerated warehouses by improving the efficiency of the electric systems of the plants. However, improving the power factor is an important method for increased efficiency. [ top]