ENERGY-SAVING TWO-STAGE AIR HEAT PUMP Russian patent published in 2013 - IPC F25B30/02 F24F13/00 

FIELD: engines and pumps.

SUBSTANCE: energy-saving two-stage heat pump includes two units connected to each other and separated on the inside with a horizontal partition wall into isolated paths of plenum air and exhaust air. Air purifying filters, primary heat exchangers connected to each other by means of pipeline with a plate-type heat exchanger, a pump and solenoid-type valves, which are arranged on it, are installed in the first unit in the air flow direction in both paths. An additional heat exchanger and an adiabatic humidification plant are installed in the exhaust air path before the primary heat exchanger. A heat exchanger, an adiabatic humidification plant, a heater and a suction fan are installed in series in the air flow direction in the second unit in the plenum air path, and a compressor, a four-way valve, a heat exchanger and a fan are installed in series in the exhaust air path in the air flow direction. Heat exchangers in the second unit are interconnected in the paths.

EFFECT: increasing thermotechnical efficiency of the first utilisation stage at heating of plenum ambient air; eliminating the possible formation of ice on heat exchanger surfaces in exhaust flow; possible use of the first stage during the warm season of the year for cooling of plenum ambient air.

2 cl, 1 dwg