Efficient direct-heating type stair coupling heat pump water heater

Abstract

The invention discloses an efficient direct-heating type stair coupling heat pump water heater. The efficient direct-heating type stair coupling heat pump water heater comprises an evaporator, a firstcompressor, an intermediate heat exchanger, a first throttling valve, a first water pump, a water storage tank, a second water pump and a second compressor. An outlet of the evaporator is connected with an air suction opening of the first compressor, an exhaust opening of the first compressor is connected with a first inlet of the intermediate heat exchanger, a first outlet of the intermediate heat exchanger is connected with an inlet of the first throttling valve, and an outlet of the first throttling valve is connected with an inlet of the evaporator. An outlet of the first water pump is connected with a first inlet of the water storage tank, a first outlet of the water storage tank is connected with a second inlet of the intermediate heat exchanger, a second outlet of the intermediateheat exchanger is connected with an inlet of the second water pump, an outlet of the second water pump is connected with a second inlet of the water storage tank, and a third outlet of the water storage tank is a moderate-temperature hot water outlet. The efficient direct-heating type stair coupling heat pump water heater has the advantages that the efficiency is high, the loads of the compressorsare light in the low-temperature environment, and the service life is prolonged.

Description

technical field [0001] The invention belongs to water heaters and relates to a direct heating type cascade coupling heat pump water heater. Background technique [0002] In recent years, people's quality of life has been continuously improved with economic growth, and the demand for hot water in various production and living fields has also been continuously increased. This has also promoted the majestic development of the water heater industry, and heat pump water heaters with the advantages of energy saving, environmental protection, and high efficiency have become more and more popular among users. [0003] However, most of the existing heat pump water heaters use single-stage compression to heat to a certain temperature, and then mix cold water with it to obtain a suitable temperature. Adopting this mode of heating and using heat will lead to large entropy production, resulting in unnecessary losses, and greatly reduces the coefficient of efficiency (COP) of the heat ...

AI Technical Summary

Problems solved by technology

Adopting this mode of heating and using heat will lead to large entropy production, resulting in unnecessary loss, and greatly reduces the coefficient of efficiency (COP) of the heat pump

Existing heat pump water heaters have a large demand for water temperature rise and low ambient temperature, the temperature difference between the inlet and outlet and the suction and exhaust pressure will always be at a large value, and the discharge temperature is high, which greatly increases the load on the compressor. , this will not only greatly reduce the service life of the compressor, but may even cause damage to the entire system

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