Patent ID: 11927366
Assignee: BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
Field: Civil engineering (Other fields)
Classification: CPC F  E  Y | IPC E  F

Claim 0:
1. A cold-storage instantaneous heat pump water heater (HPWH), wherein the heat pump water heater comprises a cold-water tank, a main evaporator, a compressor, and a hot water heat exchanger; and a condenser is arranged in the hot water heat exchanger;
a working medium is filled in the cold-water tank, the main evaporator is arranged in the cold-water tank, and an outlet of the main evaporator is connected to an inlet of the condenser through the compressor; and an outlet of the condenser is connected to an inlet of the main evaporator through an expansion valve; and
a water inlet of the hot water heat exchanger is connected to a water outlet of a tap water pipe, a water outlet of the hot water heat exchanger is connected to a first water inlet of a mixing valve, a second water inlet of the mixing valve is connected to the water outlet of the tap water pipe, and a water outlet of the mixing valve is connected to a shower head;
wherein the HPWH further comprises a thermal insulation layer, and the thermal insulation layer is coated outside the cold-water tank; and a thickness of the thermal insulation layer is a thickness corresponding to a time interval of 10-20 hours in which the working medium in the cold-water tank rises from a temperature after bathing to an ambient temperature; the temperature of the water stored in the cold-water tank is always less than or equal to the ambient temperature;
heat of a working medium in the cold-water tank is absorbed by the main evaporator, so that a temperature of the working medium in the cold-water tank is lower than an ambient temperature, and the working medium in the cold-water tank can slowly absorb heat from the environment;
wherein the HPWH further comprises an auxiliary evaporator and a three-way valve;
an inlet and a first outlet of the three-way valve are serially connected to a pipe between an outlet of the expansion valve and an inlet of the compressor, and a second outlet of the three-way valve is communicated with an inlet of the auxiliary evaporator; and
an outlet of the auxiliary evaporator is communicated with a pipe between the first outlet of the three-way valve and the inlet of the compressor;
wherein the auxiliary evaporator is one or more of a steam evaporator, an exhaust evaporator, and a wastewater evaporator; and
the steam evaporator is disposed on a top of a bathroom, the exhaust evaporator is disposed on an air outlet of the bathroom, and the wastewater evaporator is disposed on a floor of a shower area in the bathroom.