The amount of heat required to raise the temperature of one gram of water by one degree Centigrade. Most often found in high stage ammonia compressors. Regulates flow of liquid refrigerant into the evaporator or liquid overfeed system. Sometimes called foul gas. At sea level, psig, plus 14.7.
Liquid refrigerant is stored here until it is needed by the system.
Within a closed system it is evaporated, condensed and evaporated again to transfer heat from the area of evaporation to the area of condensation. Normally taken using a thermometer with a wetted wick on its bulb. The air is moved rapidly over the bulb to get the wet bulb reading. Used for determining humidity.