set of operating conditions under which a single level of performance results, and which causes only that level of performance to occur.

adj. moving forward and backward alternately.

 1. condition pertaining to cooling towers and evaporative condensers in which a portion of the discharge air enters along with the fresh air; the amount of recirculation is determined by equipment design, placement in regard to adjoining objects, and atmospheric conditions. The effect is generally evaluated on the basis of the increase in entering wet-bulb temperature compared to the ambient.

2. a condition pertaining to air-cooled condensers in which a portion of the discharge air enters along with the fresh air; the amount of recirculation is determined by equipment design, placement in regard to adjoining objects, and atmospheric conditions. The effect is generally evaluated on the basis of the decrease in unit capacity.

liquid overfeed system (preferred term). See refrigerating system.

recirculation-type evaporator circulating-type evaporator (preferred term). See evaporator.

1. externally-cooled heat exchanger in the high side of a refrigerating absorption system for condensing absorbent and separating it from the refrigerant before passing it to the condenser.

refrigerated space or refrigerated transport carrier

portion of the incident radiation on a surface that is reflected from the surface. Note: For an opaque surface, the sum of the reflectance and the absorptance is unity at equilibrium. Absorptances and reflectances are of various types, as are emittances. For most engineering purposes, the counterparts of the hemispherical total emittance suffice.

1. in a refrigerating system, the medium of heat transfer which picks up heat by evaporating at a low temperature and pressure, and gives up heat on condensing at a higher temperature and pressure.

1. actual amount of refrigerant in a closed system.