Hot water unit of overlapping air source high-temperature heat pump

Abstract

The invention provides a cascade air source high-temperature heat pump hot water unit. The cascade air source high-temperature heat pump hot water unit comprises medium and high temperature compressors, medium and high temperature condensers, coupling heat exchangers, medium and high temperature expansion valves and a finned-tube evaporator, which constitute a medium temperature loop and a high temperature loop; one end of the medium temperature compressor is sequentially connected with the medium temperature condenser, the coupling heat exchanger, the medium temperature expansion valve and the finned-tube evaporator, the other end of the evaporator is connected with the other end of the medium temperature compressor, and the parts constitute the medium temperature loop; one end of the high temperature compressor is sequentially connected with the high temperature condenser, the high-temperature expansion valve and the coupling heat exchanger, the other end of the coupling heat exchanger is connected with the other end of the high temperature compressor, and the parts constitute the high temperature loop; a waterway of the medium temperature condenser and the waterway of the high temperature condenser are connected in series. The cascade air source high-temperature heat pump hot water unit increases the temperature of hot water to 85 DEG C from room temperature by the cascade heat exchange technology, the dual-refrigerant coupling heat exchange technology and the water side series coupling heat exchange technology.

Description

technical field [0001] The invention relates to refrigeration and heating equipment, in particular to a cascade air source high temperature heat pump water heater unit. Background technique [0002] At present, the heat pump hot water units promoted in the market are roughly divided into the following categories: [0003] 1. Low-temperature heat pump hot water unit, which produces hot water at about 45°C, uses air, groundwater or soil as the heat source, and is mainly used for heating or production. [0004] 2. Medium-temperature heat pump hot water unit, which produces hot water at a temperature of 55°C to 60°C, uses air, groundwater or soil as a heat source, and is mainly used for bathing or living. [0005] 3. Water source high-temperature heat pump hot water unit, which produces hot water at a temperature of 75°C to 85°C, uses low-temperature waste water or waste heat as the heat source, and is mainly used for process requirements; due to the high temperature of the hea...

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Problems solved by technology

[0005] 3. Water source high-temperature heat pump hot water unit, which produces hot water at a temperature of 75°C to 85°C, uses low-temperature waste water or waste heat as the heat source, and is mainly used for process requirements; due to the high temperature of the heat source required by this technology, the application site is subject to very limited

[0006] At present, high-temperature hot water around 85°C is mainly obtained by burning chemical fuels or using electric heating. Combustion of chemical fuels will emit a large amount of harmful gases to the environment, causing great harm to the environment. In addition, fluctuations in fuel prices directly affect this. The economic benefits of a method

In addition, the country is currently committed to banning small boilers. Many enterprises that need high-temperature hot water can only produce hot water through electric heating. As a high-grade energy source, the efficiency of electricity for producing hot water is only 0.95. , is also a kind of waste

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