Refrigeration and Air Conditioning Technology

Refrigeration and Air Conditioning Technology Absolute Pressure - -gauge pressure + atmospheric pressure, normally 14.696 at sea level at 70F Absolute Zero Temperature - -The lowest obtainable temperature where molecular motion stops, -460°F and -273°C. Absorbent (Attractant) - -The salt solution used to attract water in an aborption chiller Absorber - -The part of an absortion chiller where the water is absorbed by the salt solution Absorption - -The process by which one substance is absorbed by another Absorption air-Conditioning chiller - -A system using a salt substance, water, and heat to provide cooling for an air conditioning system ABS pipe - -Acrylonitrile-butadiene-styrene plastic pipe used for water, drains, waste, and venting ACCA Manual J - -The Air Conditioning Contractors of America Manual that facilitates the calculations of heat gains and heat losses in residentials structures Accumulator - -A storage tank located in the suction line. It allows small amounts of liquid refrigerant to boil away before entering the compressor. Sometimes used to store excess refrigerant in heat pump systems during winter cycles. Acetylene - -A gas often used with air or oxygen for welding, brazing or soldering applications ACH - -Air changes per hour ACH50 - -Air changes per hour of air leakage while the blower door is connected and pulling 50 pascal of vaccum on the house Acid-contaminated system - -A refrigeration system that contains acid due to contamination "A" Coil - -An evaporator coil that can be used for upflow, downflow, and horizontal-flow applications. It actually consists of two coils shaped like a letter "A" AIR ACR tubing - -Air-conditioning and refrigeration tubing that is very clean, dry, and normally charged with dry nitrogen. The tubing is sealed at the ends to contain the nitrogen Activated Alumina - -A chemical dessicant used in refrigerant driers Activated Charcoal - -A substance manufactured from coal or coconut shells into pellets. It is often used to absorb solvents, other organic materials and odors Active Recovery - -Recovering refrigerant with the use of a recovery machine that has its own built-in compressor Active Sensor - -Sensors that send information back to the controller in terms of milliamps (mA) or volts Active Solar System - -A system that uses electrical and/or mechanical devices to help collect, store, and distribute the sun's energy Adsorption - -The process by which a thin film of a liquid or gas adheres to the surface of a solid substance Air, Standard - -Dry air at 70F and 14.696 psi, at which it has a mass density of 0.075 lb/ft3 and a specific volume of 13.33 ft3/lb, ASHRAE Air-Aacetylene - -A mixture of air and acetylene gas that when ignited is used for soldering, brazing, and other applications