Patents by Inventor Rongji XU

Rongji XU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Cold-storage instantaneous heat pump water heater
    Patent number: 11927366
    Abstract: The present invention provides a cold-storage instantaneous heat pump water heater (HPWH). The HPWH includes a cold-water tank, a main evaporator, a compressor, and a hot water heat exchanger. In the present invention, heat of a working medium in the cold-water tank is absorbed by the main evaporator, and bathing water is rapidly heated by the hot water heat exchanger (condenser of the heat pump), thereby realizing instant heating with small input electrical power. Cold-water tank replaces the hot water tank of conventional HPWH avoiding energy loss during hot water storage. The working medium in the cold-water tank absorbs heat from the environment, to further improve energy utilization. In addition, there are three energy recovery evaporators to recover the waste heat of bathing.
    Type: Grant
    Filed: March 3, 2020
    Date of Patent: March 12, 2024
    Assignee: BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
    Inventors: Rongji Xu, Yinshi Li
  • COLD-STORAGE INSTANTANEOUS HEAT PUMP WATER HEATER
    Publication number: 20210207848
    Abstract: The present invention provides a cold-storage instantaneous heat pump water heater (HPWH). The HPWH includes a cold-water tank, a main evaporator, a compressor, and a hot water heat exchanger. In the present invention, heat of a working medium in the cold-water tank is absorbed by the main evaporator, and bathing water is rapidly heated by the hot water heat exchanger (condenser of the heat pump), thereby realizing instant heating with small input electrical power. Cold-water tank replaces the hot water tank of conventional HPWH avoiding energy loss during hot water storage. The working medium in the cold-water tank absorbs heat from the environment, to further improve energy utilization. In addition, there are three energy recovery evaporators to recover the waste heat of bathing.
    Type: Application
    Filed: March 3, 2020
    Publication date: July 8, 2021
    Inventors: Rongji XU, Yinshi LI