| A | B |
|---|
| Azeotropic | Two or more refrigerants mixed together that will have only one boiling and/or condensing point for each system pressure. Negligible fractionation or temperature glide will occur. |
| Boiling Point of the Refrigerant | The temperature level of a liquid at which it begins to change to a vapor. The boiling temperature is controlled by the vapor pressure above the liquid. |
| Centrifugal Compressor | A compressor used for large refrigeration systems that uses centrifugal force to accomplish compression. It is not positive displacement, but it is similar to a blower. |
| Chlorofluorocarbons | Those refrigerants thought to contribute to the depletion of the ozone layer. |
| Compressor | A vapor pump that pumps vapor (refrigerant or air) from one pressure level to a higher pressure level. |
| Condenser | The component in a refrigeration systems that transfers heat from the system by condensing refrigerant. |
| Dehumidifying | To remove moisture from the air. |
| Enthalpy | The amount of heat a substance contains from a predetermined base or point. |
| Evaporator | The component in a refrigeration system that absorbs heat into the system and evaporates the liquid refrigerant. |
| Flash Gas | A term used to describe the pressure drop in an expansion device when some of the liquid passing through the valve is changed quickly to a gas and cools the remaining liquid to the corresponding temperature. |
| Hot Gas Line | The tubing between the compressor and condenser. |
| Humidity | Moisture in the air. |
| Hydrochlorofluorocarbons (HCFCS) | Refrigerants containing hydrogen, chlorine, fluorine, and carbon, thought to contribute to the depletion of the ozone layer, although not to the exent of chloroflurocarbons. |
| Hydroflurocarbons (HFCs) | A chlorine-free refrigerant containing hydrogen, fluorine, and carbon with zero ozone depletion potential. |
| Isobars | Lines on a chartor graph that represent a constant pressure. |
| Isotherms | Lines on a chart or graph that represent a constant temperature. |
| Leak Detection Devices | Any device used to detect leaks in a pressurized system. |
| Liquid Line | A term applied in the industry to refer to the tubing or piping from the condenser to the expansion device. |
| Near-azeotropic | Two or more refrigerants mixed together that will have a small range of boiling and/or condensing points for each system pressure. Small fractionation and temprature glides will occur but are often negligible. |
| Net Refrigeration Effect | The quantity of heat in Btu/lb that the refrigerant absorbs from the refrigerated space to produce useful cooling. |
| Ozone Layer | A for mo foxygen (O3) A layer of ozone is inthe stratosphere that protects the earth from certain of the sun's ultraviolet wavelengths. |
| Pressure-Enthalpy Diagram | A chart indicating the pressure and heat content of a refrigerant and the extent to which the refrigerant is a liquid and vapor. |
| Temperature/Pressure Relationship | This refers to the temperature/pressure relationship of a liquid and vapor in a closed container. If the temperature increases, the pressure will also increase. If the temperature is lowered, the pressure will decrease. |
| Pure Compound | A substance formed in definite proportions by weight with only one molecule present. |
| Reciprocating Compressor | A compressor that uses a piston in a cylinder and a back-and-forth motion to compress vapor. |
| Refrigerant | The fluid in a refrigeration system that changes from a liquid to a vapor and back to a liquid at practical pressures. |
| Refrigerant Reclaim Refrigerant Recovery | "To process refrigerant to new product specifications by means which may include distillation. It will require chemical analysis of the refrigerant to determine that appropriate product specifications are met. This term usually implies the use of processes or procedures availabl only at a reprocessing or manufacturing facility". |
| Refrigeration | The process of removing heat froma place where it is not wanted and transferring that heat to a place where it makes little or no difference. |
| Rotary Compressor | A compressor that uses rotary motion to pump fluids. It is a positive displacement pump. |
| Screw Compressor | A form of positive displacement compressor that squeezes fluid from a low-pressure area to a high-pressure area, using screw-type mechanisms. |
| croll Compressor | A compressor that uses two scroll-type components, one stationary and one orbiting, to compress vapor. |
| Suction Line | The pipe that carries the heat-laden refrigerant gas from the evaporator to the compressor. |
| Superheat | The temperature of vapor refrigerant above its saturation (change-of-state) temperature. |
| Temperature Glide | When a refrigerant blend has different temperatures when it evaporates and condenses at a single given pressure. |
| Ton of Refrigeration | The amount of heat required to melt a ton (2000lb) of ice at 32°F in 24 hours, 288,000 Btu/24h, 12000 Btu/h, or 200 Btu/min. |
