Wastewater source heat pump water heater of residential buildings

Abstract

The invention discloses a wastewater source heat pump water heater of residential buildings. The water heater comprises a refrigerant circulation loop, a wastewater collecting pipe (1.1), a wastewater discharge pipe (1.3), a running water pipe (2.1), a heating pipe (2.3), a wastewater heat recovery exchanger (5), a hot water transition pipe (2.2) and a wastewater transition pipe (1.2), wherein the wastewater collecting pipe (1.1) is communicated with the wastewater heat recovery exchanger (5), the wastewater heat recovery exchanger (5) is communicated with the wastewater transition pipe (1.2), the wastewater transition pipe (1.2) is communicated with a wastewater heat exchanger (4); and the running water pipe (2.1) is communicated with the wastewater heat recovery exchanger (5), the wastewater heat recovery exchanger (5) is communicated with the hot water transition pipe (2.2), and the hot water transition pipe (2.2) is communicated with a hot water heat exchanger (3). The energy efficiency ratio of the heat pump water heater is high and the condition that the compressor is damaged due to overload operation can be avoided.

Description

technical field [0001] The invention relates to a heat pump water heater, in particular to a residential building wastewater water source heat pump water heater. Background technique [0002] Residential buildings, such as public bathrooms, hotels, and residential buildings, after the bathroom waste water is concentrated through the sewer pipes, its temperature generally remains above 25°C. In order to make full use of the waste heat in this part of the waste water, people generally use a water-to-water type (that is, both cold and heat sources use water) water source heat pump as a heat pump water heater, use the concentrated bathroom waste water as the outdoor medium, and use tap water as the indoor medium. The refrigerant circulation loop transfers the low-level heat energy in the bathroom wastewater to the tap water to form hot water at 55-60°C. [0003] A traditional heat pump water heater includes a closed refrigerant circulation loop consisting of a compressor, a hot...

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Problems solved by technology

[0005] But the heat pump water heater of prior art has following defect: because this heat pump water heater is not specially designed for bathroom waste water, so its energy efficiency ratio is low, and the waste heat utilization of waste water is insufficient; ℃, at this time, the workload of the refrigerant circulation circuit will be increased, and the overload operation of the system may easily cause damage to the compressor

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