US 11,927,366 B2
Cold-storage instantaneous heat pump water heater
Rongji Xu, Beijing (CN); and Yinshi Li, Beijing (CN)
Assigned to BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE, Beijing (CN)
Filed by BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE, Beijing (CN)
Filed on Mar. 3, 2020, as Appl. No. 16/807,718.
Claims priority of application No. 202010016832.8 (CN), filed on Jan. 8, 2020.
Prior Publication US 2021/0207848 A1, Jul. 8, 2021
Int. Cl. F24H 4/04 (2006.01); E03B 7/04 (2006.01); E03B 7/07 (2006.01)
CPC F24H 4/04 (2013.01) [E03B 7/045 (2013.01); E03B 7/07 (2013.01)] 10 Claims
OG exemplary drawing
 
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.