METHOD FOR HEAT-PUMP UTILIZATION OF THE LOW-POTENTIAL HEAT ENERGY OF THE VENT AIR OF THE SUBWAY AND INSTALLATION FOR ITS UTILIZATION

摘要

Method for heat-pump utilization of the low-potential heat energy of the vent air of the subway includes circulation of working body with its phase transitions in the circuit of the heat pump, cooling the ventilation air in evaporator with use of additional heat exchanger, increase of potential of the working body in compressor and cooling it in condenser, with obtaining heat carrier for the objects heat supply. The air being cooled is separated into two not equal in flow rate flows, those are in turns directed to two identical parts of the evaporator; the liquid working body, synchronously with variation of flow rate of the air flows, is directed to the part of the evaporator through which the larger in flow rate flow goes, the thermal energy of the smaller in flow rate flow is used for purification of the non-operating part of the evaporator with removal of the ice. The apparatus for the heat-pump utilization of low-potential thermal energy of ventilation air of subway includes heat pump with the circuit of the working body circulation, with evaporator and condenser, those are connected to the system of heat supply. The evaporator of the heat pump is made of two same heat exchangers connected to the circuit of circulation of working body in parallel. The unit additionally includes the separator-switch of air flows, the switch of direction of motion of the working body, sensors of temperature of the both parts of the evaporator, sensor of air temperature, electronic circuit and appliance for connection and discharge of drop moisture. The method for utilization and installation for its implementation make it possible to get, due to partial low-temperature heat energy, economy in expenses for energy carriers.