MULTIZONE AIR-CONDITIONING SYSTEM WITH REHEAT

摘要

An improved air-conditioning reheat system having a control valve responsive to the airstream temperature leaving the reheat coil for restricting refrigerant flow through one of two parallel refrigerant condensers upstream of the reheat coil when increased reheat is called for thereby flooding one condenser with liquid refrigerant and reducing the total condenser capacity to allow a combination of saturated liquid and vapor refrigerant from the other condenser to be delivered to the reheat coil serially connected between the condensers and the evaporator. The reheat coil, which functions as a liquid-to-air heat exchanger during normal operation with low reheat, then becomes a condenser to provide additional transfer capability. A bypass capillary allows a trickle of liquid refrigerant from the flooded condenser into the refrigerant flow path to prevent the flooded condenser from becoming logged with oil and to control the amount of uncondensed vapor refrigerant being fed to the reheat coil.