At Koldaire, Inc. the commercial chiller install has become a company speciality. Heating, ventilation and air conditioning (HVAC) chillers are refrigeration systems that provide cooling for industrial and commercial applications. They use water, oils or other fluids as refrigerants. HVAC chillers include a compressor, condenser, thermal expansion valve, evaporator, reservoir, and stabilization assembly. Compressing the refrigerant creates a high pressure, superheated gas that the condenser air-cools to a warm liquid. The thermal expansion valve (TXV) releases refrigerant into the evaporator, converting the warm liquid to a cool, dry gas. Often, a hot gas bypass is used to stabilize the cooling output by allowing the hot gas to warm up the evaporator. This causes a reduction in cooling efficiency, but stabilizes the chilled water temperatures. When water is pumped from the reservoir to the compressor, the chilling cycle begins again.
HVAC chillers vary in terms of condenser cooling method, cooling specifications and process pump specifications. There are several condenser cooling methods. Air-cooled devices use a fan to force air over the condenser coils. By contrast, water-cooled devices fill the condenser coils with circulating water. Remote air or slit systems locate the main part of the chiller in the application area and position the condenser remotely, usually outdoors. Cooling specifications for HVAC chillers include cooling capacity, fluid discharge temperature, and compressor motor horsepower. Typically, cooling capacity is measured in kilowatts or tons of refrigeration. Compressor motor horsepower is a nominal value. Process pump specifications include process flow, process pressure, and pump rating.