A Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied t...

The overload relay is a protection device used in the compressor circuit on your refrigerator. Power is applied to the compressor motor win...

In a centrifugal compressor, 'surge' is a name given to a dangerously unstable gas condition in the compressor and condenser. Put s...

The flow separation will eventually cause a decrease in the discharge pressure, and flow from suction to discharge will resume. Surging can ...

Community Water Treatment Drinking water supplies in the United States are among the safest in the world. However, even in the U.S., drinki...

A vacuum is maintained in the condenser so that steam can easily flow and more work can be extracted from the steam in the turbine. How does...

Filter Driers Filter driers are devices used in a HVAC system that are a combination of filter and dryer (or drier). A filter is used ...

Two components are heavily relied upon in the industrial and manufacturing sectors, and these are the actuator and the valve. And...

Why is Air Conditioner Leaking Water Inside Here’s a common question we get during Florida summers, “Why is my AC leaking water ins...

So you’ve been told that your AC compressor’s “gone bad.” This will likely lead you to a series of questions. Questions like, how did this...

CFCs Number Cylinder Color Refrig. Name Application R-11 Orange Trichloromonofluoromethane Centrifugal Chillers R-12 White ...

This will cause the  following  symptoms failure of Exoension Valve: Low  evaporator (suction)  pressure ; High evaporator and com...

The Seven Greatest Safety Threats to HVAC Contractors Safety Threats to HVAC Contractors The HVAC industry provides ...

Coefficient of performance . The efficiency of a  refrigerator  or heat pump is given by a parameter called the  coefficient of performance...

Fan Coil Unit  Systems. A  fan coil unit ( FCU ) contains a fan which draws the air in a space into the unit then blows it over a cooling o...

Air Handling unit or AHU is an assembly of air conditioning components (such as fans, cooling coils, filters, humidifiers and dampers) int...

An  Air Handling Unit  ( AHU ) is used to condition and circulate air as part of a heating, ventilating, and air-conditioning system. The b...

Basic Refrigeration Cycle Principles of Refrigeration Liquids absorb heat when changed from liquid to gas Gases give off heat ...

Chiller System Overview Chillers use either a vapor-compression or absorption refrigerant cycle to cool a fluid for heat transfer. Bot...

What does TR mean in air conditioning Originally 1 TR was defined as the rate of heat  transfer required  to make 1 short ton (200...

 Superheat and Subcooling Superheat and subcooling are critical to the refrigeration cycle, but can be tough concepts to visualize. Le...