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 generally maintain a temperature above 25°C after the bathroom wastewater is concentrated by the sewer pipe. In order to make full use of this part of the waste heat in the wastewater, people generally use a water-to-water type (that is, both the cold and heat sources use water) water-source heat pump as the heat pump water heater, the concentrated bathroom wastewater is used as the outdoor medium, and the tap water is used as the indoor medium. The refrigerant circulation loop transfers the low-level thermal energy in the bathroom wastewater to the tap water to form 55-60 ℃ hot water. [0003] The traditional heat pump water heater includes a closed refrigerant circulation loop composed of a compressor, ...

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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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