DEVICE FOR UTILIZATION OF LOW-GRADE HEAT OF SUBWAY EXHAUST AIR AND METHOD OF USE THEREOF Russian patent published in 2020 - IPC F27D9/00 

FIELD: ventilation.

SUBSTANCE: invention relates to a device for utilization of low-grade heat of exhaust air of a subway ventilation system and a method for its use. Device comprises an exhaust channel, a fan, a heat pump with a heat exchanger-waste heat exchanger, a compressor, a condenser and a throttling device and a chamber located next to said exhaust channel, said duct accommodates air duct communicated via inlet and outlet with said exhaust channel and comprising additional fan and heat exchanger arranged therefrom and connected to heat compression steam compression chamber with compressor, condenser and throttle device. Disclosed is a method of using the device, involving cooling exhaust air, wherein part of the flow of exhaust air with an additional fan is discharged through an air duct located in the chamber into the heat exchanger-utilizer, in which by means of steam-compression cycle of heat pump it is cooled and its heat utilization and then returned to main flow of exhaust air in front of main exhaust fan with formation of parallel flow of exhaust air, wherein air cooling is performed to temperature below dew point, and the dropping condensate is injected into the withdrawn air flow before the heat exchanger-waste heat exchanger, and in the absence of demand for low-potential heat energy, additional fan and heat pump are switched off.

EFFECT: energy saving and exclusion of disturbed mode of exhaust ventilation and additional power consumption to drive of main ventilation unit of increased head due to necessity to overcome aerodynamic resistance of heat exchanger-waste heat exchanger.

3 cl, 1 dwg