Evaporator Coil Air Conditioners - the evaporator in air conditioners is responsible for absorbing heat into the coils and the refrigerant. The evaporator in heat pumps and air conditioners is an essential component of vapor compression refrigeration. This is usually done as a result of passing air or water over the evaporator coil where a heat exchange process takes place.
Heat leaves the air or water (whatever medium is used) and is absorbed into the coil and the liquid refrigerant. As more and more heat is absorbed by the evaporator coil and the refrigerant again changes state from a liquid to a refrigerant vapor. By the time the refrigerant leaves the evaporator coil the refrigerant should be all vapor and ready to be received again by the refrigeration compressor. (more…)
The Condenser in the Refrigeration Process - The condenser coil receives the high-pressure high-temperature refrigerant vapor from the compressor and immediately begins to remove heat from the refrigerant vapor. As the refrigerant vapor makes its way through the condenser coil more and more heat is removed and the refrigerant vapor changes state from a refrigerant vapor to a refrigerant liquid. (more…)
HVAC Centrifugal Compressors - Centrifugal compressors are used in many applications including pipeline transport of natural gas along with many other related applications including vapor compression refrigeration. These compressors have different operating limitations than the reciprocating compressor, the scroll compressor, and the rotary compressor.
They work in an operating range where it works efficiently however outside of this range, either the over or under that operating range is basically useless. Other issues make them not ideal for use in certain applications because of the operating range issues. (more…)
Rotary Compressors - The rotary compressor used in HVAC applications for air conditioning and heating systems offer some of the most efficient air conditioner and heat pump systems one can find on the market.
Despite the rotary compressor being a key component of an air-source air conditioner or heat pump the efficiency offered by this compressor when used as a modulating compressor can exceed efficiency ratings of some geothermal systems.
When the compressor is coupled to an inverter and the proper inverter control system the efficiency of the air-source air conditioner or heat pump system spike to match those of some geothermal air conditioner or heat pump systems. (more…)
Refrigeration for HVAC - Air conditioners and heat pumps use the process of refrigeration to provide heating and cooling. What is the definition of the process of refrigeration? Refrigeration is the process of moving heat and depending on whether it is a heat pump or air conditioner and what mode it is in will depend on where you are moving the heat. An air conditioner and a heat pump (in the cooling mode) will move heat outside. The evaporator coil absorbs the heat and the condenser rejects the heat. (more…)
This chilled water unit is a new ammonia chiller. This unit is also unique in that it has no compressor. Instead, it uses the chemical properties of ammonia and heat from natural gas to condense the refrigerant which is ammonia. A chiller provides chilled water to a chilled water loop. (more…)
These compressors are integral to a vapor compression refrigeration system in a supermarket
The process of refrigeration uses the vapor-compression refrigeration cycle to move heat from one place to another. In many HVAC air conditioner and heat pump applications, the process of refrigeration or the vapor-compression cycle is what makes it work. This process, in the air conditioning mode, moves heat from inside the structure to the outside. (more…)
DX CRAC Unit Condensers | Critical Facility HVAC - Most data centers do not utilize HVAC DX (Direct Expansion) CRAC units or air conditioning but instead use chilled water systems to provide cooling for the data center. In smaller buildings such as remote telecom buildings, DX air conditioning systems are used to keep the equipment cool and operating efficiently. (more…)
HVAC Tip - A thermocouple is commonly used in standing pilot gas furnaces and water heaters are technically referred to as a copple element and produces millivolts when heat is applied to the tip. This millivoltage is necessary to keep the pilot valve inside the gas valve open. If the pilot flame goes out, the thermocouple stops generating millivolts. Without the millivolts, the valve closes thus preventing gas from escaping when there is no flame. Thermocouples fail because of oxidation. It is recommended that you keep the pilot lit throughout the year to prevent excess oxidation. The thermocouple can be found in many different types of gas furnaces, gas logs, and gas water heaters. Learn How to Test a Thermocouple with a Multi-Meter
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Evaporator Coil Air Conditioners - the evaporator in air conditioners is responsible for absorbing heat into the coils and the refrigerant. The evaporator in heat pumps and 
Refrigeration for HVAC - 
This chilled water unit is a new ammonia chiller. This unit is also unique in that it has no compressor. Instead, it uses the chemical properties of ammonia and heat from natural gas to condense the refrigerant which is ammonia. A chiller provides chilled water to a 
DX CRAC Unit Condensers | Critical Facility HVAC - Most data centers do not utilize HVAC DX (Direct Expansion) CRAC units or air conditioning but instead use chilled water systems to provide cooling for the data center. In smaller buildings such as remote telecom buildings, DX air conditioning systems are used to keep the equipment cool and operating efficiently. 