The heat is on. Summer is bearing down on us, and it’s bound to stick around for a while. As you’re in and out of buildings day-to-day, could a five minute building pressure test provide the answer your customer has been longing for?

All buildings unintentionally operate under some level of positive or negative pressure. These pressures are usually caused by a defective duct system. Complaints from building pressure problems include indoor humidity issues when the fan runs, and systems that work in the cool of the morning but will not cool the building in the afternoon.

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Tower pumping does not present great difficulty in terms of good pump application.

Air Balancing is Testing, Adjusting, and Balancing commercial air conditioning and ventilation systems.There are not just a few words that describe it. Balancing first came in need in the early 80's when new and more advanced A/C systems were being installed. As these systems began to get more complex the need for balancing increased. A very expensive and complex system was not complete without an independent balance company doing the TAB work. Click on link:

http://www.airbalancingco.com/tutorial.html

A cleanroom is a controlled environment where products are manufactured. It is a room in which the concentration of airborne particles is controlled to specified limits. Eliminating sub-micron airborne contamination is really a process of control. These contaminants are generated by people, process, facilities and equipment. They must be continually removed from the air. The level to which these particles need to be removed depends upon the standards required. The most frequently used standard is the Federal Standard 209E. The 209E is a document that establishes standard classes of air cleanliness for airborne particulate levels in cleanrooms and clean zones. Strict rules and procedures are followed to prevent contamination of the product.

http://www.coastwidelabs.com/Technical%20Articles/Cleaning%20the%20Cleanroom.htm

Service

Operation of AC & R Plants

Trial Run and Handing Over of AC & R Plants

Erection Quality Control

Charging of Oil, Refrigerant and Brine

Vacuumising of AC & R Systems

Pressure Testing of AC & R Systems

Capacity Measurement and Performance Evaluation of A C Systems

Fans

Workshop on Fans

Psychrometrics

Understanding how to use a simplified psychrometric chart.

Operation of a plant includes diligent monitoring of the plant performance and strict adherence to routine maintenance schedules

After the completion of erection, the plant should be thoroughly checked. Following are a few simple but very important checks:

A perfectly designed airconditioning system may not perform efficiently incase of poor erection.

Lubrication is the process by which the moving parts are kept separate by a film of oil. Since heat is generated by the moving parts (bearings), the oil film also gets heated up.

A C & R system has to be without air, moisture and non condensable at the time of charging the gas and oil. The method of ensuring this is "vacuumising".

AC & R systems operate at pressures and hence have to be without leaks. The method of ensuring this is the pressure testing.

Capacity Measurement establishes the actual capacities of various components of the system as well as the total system capacity.

This describes how to use a simplified psychrometric chart to better understand the relationships between air temperature and relative humidity.

http://ianrpubs.unl.edu/generalag/g626.htm

Workshop on Fans, presentation slides by Sushil K. Choudhury.

This series of articles covers the Fundamental Principles of Refrigeration.