Browsing by Author "Wei, Wenzhe"
Now showing items 1-12 of 12
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Determination of the defrosting duration ratio for defrosting performance evaluation of air source heat pump
( Elsevier , 2024 , Article)Defrosting performance evaluation is an important aspect for pre-delivery inspection of air source heat pumps (ASHPs). According to GB/T 25127-2020 and ANSI/AHRI 550/590–2023, defrosting duration ratio (α) should not exceed ... -
Development of a variable water temperature control method for air source heat pump based on the supply–demand balance
( Elsevier Ltd , 2022 , Article)Air source heat pump (ASHP) is one of renewable energy technologies, and has been widely used for space heating. In practice applications, the setting value of its supply water temperature is long-term fixed, resulting in ... -
Energy saving and peak load shifting performance of tail water source heat pump integrated with large-scale thermal storage pool space heating system in technology park
( Elsevier , 2023 , Article)In cities, there are thousands of wastewater treatment plants. The treated tail water drained from them is clean relatively, and has a stable flow rate. Extracting heat from it through tail water source heat pumps (TWSHP) ... -
Experimental study on the effects of melted frost icing on the operating performances of air source heat pump
( Elsevier , 2024 , Article)Defrosting operation is always used to solve its frosting problem at a high humidity environment for air source heat pump units (ASHPs), and at the end of defrosting operation, the residual melted frost may exist on the ... -
Frosting-defrosting performance variations of air source heat pumps with the type of refrigerants: R410A and R32 as an example
( Elsevier , 2025 , Article)Refrigerant substitution is an important topic in developing air-source heat pumps (ASHPs). The new refrigerants were selected based on their environmental impact indices, thermodynamic performance, safety, and economy. ... -
A method for sizing air source heat pump considering the joint effect of outdoor air temperature and relative humidity
( Elsevier , 2023 , Article)When operated in a highly humid environment, frost may accumulate on the surface of the outdoor coil in air source heat pump units (ASHPs), leading to a reduction in its output heating capacity. Currently, the existing ... -
A novel coefficient of frosting suppression based on the real-time operating characteristics of air source heat pumps
( Elsevier , 2023 , Article)It has been known that for space heating ASHPs, their different configurations and operation may influence their frosting performances. However, there has been no comprehensive coefficient that can be conveniently and ... -
A novel comprehensive frosting characteristic index jointly considering the refrigerant and configuration of air source heat pumps
( Elsevier , 2025 , Article)The refrigerant and configurations represent pivotal elements in the development process of the air source heat pumps (ASHPs), exerting a considerable influence on the formation of frosting. Nevertheless, the refrigerant ... -
A novel time-current-temperature difference (T-I-T) defrosting control method for air source heat pump based on outdoor fan operation characteristics in space heating
( Elsevier , 2025 , Article)In space heating, air source heat pumps (ASHPs) always encounter mal-defrosting incidents, resulting in significant energy waste. To improve the defrosting accuracy of ASHP, this paper proposes a novel Time-Current-Temperature ... -
Performance analysis of air source heat pump space heating system with an adaptive control for supply water temperature
( Elsevier Ltd , 2022 , Article)Air source heat pumps (ASHPs) have been widely used for heating in buildings. While in practice, the setting value of its supply water temperature is always far higher than the theoretical value owing to the delayed ... -
A prediction model of the optimal defrosting initiating time for the air source heat pumps with different configurations and operations
( Elsevier , 2025 , Article)Frosting is a critical challenge that affects the energy efficiency of air source heat pumps (ASHPs). Defrosting periodically is the most widely used method to solve this problem. However, the rate of frosting varies ... -
Space heating performance analysis of air source heat pump integrated with image gray recognition-based defrosting controller
( Elsevier , 2024 , Article)In practice, owing to the unreasonable defrosting initiating method of air source heat pumps (ASHPs), mal–defrost occurs frequently, further leading to the increase of building heating energy consumption. In recent years, ...
