In the background of global warming and reducing carbon emission, air-source heat pump
water heater is used as an energy efficient technology to improve the efficiency of building …

Inspired by the principle of cascade energy utilization, the concept of cascade-heating is
introduced, and five layouts of cascade-heating high temperature heat pump (HTHP) …

A new type of air-source heat pump system with liquid subcooling defrosting (ASHPSD) was
proposed, in which a hot liquid refrigerant is used for defrosting; further, the outdoor unit of …

Traditional air source heat pumps with reverse defrosting and hot gas bypass defrosting
methods significantly decrease the heating capacity and even extract heat from the user …

There is a great demand for clean, high-temperature heating in industries. The present work
demonstrates the modeling and analysis of a high-temperature heat pump (HTHP) using a …

Abstract Carbon dioxide (CO 2, R744) is the only refrigerant in the safest class by the
ASHRAE 34 Standard in the group of natural refrigerants, with zero ozone depletion …

The current demand-based defrosting initiation strategies of air source heat pumps (ASHPs)
faces difficulty in achieving a balance between cost and robustness. Therefore, an efficient …

The performance of air-source heat pump is strongly influenced by ambient temperature
variation. Improving its stability and efficiency during wintertime is important for promoting its …

The conventional techniques for space heating consume great energy and cause great CO
2 emissions, which is not meet the requirement of sustainable development. Heat pumps are …

In the context of China's “double carbon” policy and “rural revitalization” strategy, clean and
low-carbon heating in rural areas of the northern China has become a key problem that …