Results 271 to 280 of about 8,993,127 (335)

Air Source Heat Pumps for Building Heating and Cooling

2023
Air Source Heat Pumps (ASHPs) are part of the solution to decarbonize the residential heating sector. The coefficient of performance (COP) is a measure of the instantaneous efficiency of a heat pump. The heat energy produced by an ASHP is deemed renewable if it meets a specified sustained COP over a period of time, e.g., a seasonal performance factor ...
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Experimental study of an improved air source heat pump

Energy Conversion and Management, 2004
Abstract Although the advantage of an air source heat pump (ASHP) is self evident, all kinds of ASHPs available on the market have a deadly shortcoming that prevents their application in wider areas. They cannot run smoothly where the ambient temperature is very high in summer or extremely low in winter.
Yanjun Ding, Qinhu Chai, Guoyuan Ma, Yi Jiang   +3 more
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Performance of a single-stage recuperative high-temperature air source heat pump

Applied Thermal Engineering, 2021
Heat energy of 75-100 °C is increasingly used in residential and industrial fields. However, conventional single-stage air source heat pumps suffer low efficiency and poor operating conditions when supplying such high-temperature heat energy.
Shoujun Sun, Hao-Jie Guo, Ding Lu, Yin Bai, M. Gong   +4 more
semanticscholar   +1 more source

A semi-theoretical model for energy efficiency assessment of air source heat pump systems

, 2021
Although significant progress has been made in relation to air source heat pump (ASHP) modeling, it is difficult to reflect the actual dynamic characteristics of the start-up process by a completely theoretical model, and a regression model cannot ...
Zhao-Wei Xu, Hao Li, S. Shao, Wei Xu, Zhi-Chao Wang, Yichao Wang, Xiaoyu Sun, Qiang Yang, Ce Xu, Wenyuan Zhao   +9 more
semanticscholar   +1 more source

Performance analysis of a textile based solar assisted air source heat pump with the energy and exergy methodology

Sustainable Energy Technologies and Assessments, 2021
Solar air collectors are integrated into the air source heat pump in order to increase the performance of the heat pump in cold climate regions. The evaporator air is heated by solar air collectors.
Tolga Ural, Gülşah Karaca Dolgun, O. Güler, Ali Keçebaş   +3 more
semanticscholar   +1 more source

The difference between vapor injection cycle with flash tank and intermediate heat exchanger for air source heat pump: An experimental and theoretical study

, 2021
As a widely used technique, vapor injection plays an important role in air source heat pumps (ASHPs) which operate across a wide range of ambient temperatures.
Ji-Jin Wang, Dehu Qv, Yang Yao, L. Ni
semanticscholar   +1 more source

A novel defrosting initiation strategy based on convolutional neural network for air-source heat pump

International journal of refrigeration, 2021
Defrosting is an essential and vital part of the air source heat pump (ASHP) to restore the heating capacity and operating performance during the wintertime when the humid ambient air can cause frosting on the surface of the evaporator.
Wen-Yi Wang, Qun Zhou, Guanyu Tian, Yikai Wang, Zhongfan Zhao, Fengjin Cao   +5 more
semanticscholar   +1 more source

Measurement and investigation into air source heat pump exergy

SPIE Proceedings, 2011
This study applies the second law of thermodynamics to analyze the irreversibility of air source heat pump systems. By using both T type thermocouple wires to measure the inlet and outlet temperatures of key components in the system and using pressure transmitters to measure the high and low pressure of the experiment systems, we collect data and use
Hung-Pin Cho, Ching-Wei Hsu, Ching-Song Jwo, Meng-Ying Tsai, Sih-Li Chen   +4 more
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A determination method of defrosting start time with frost accumulation amount tracking in air source heat pump systems

, 2021
In this paper, a novel determination method of defrosting start time based on frost accumulation amount tracking (FAAT) is proposed for air source heat pump systems.
Yoong Chung, S. Na, J. Yoo, Min Soo Kim
semanticscholar   +1 more source

Feasibility and performance study on hybrid air source heat pump system for ultra-low energy building in severe cold region of China

, 2020
The application of air source heat pumps is mainly restricted by the outdoor ambient temperature, which causes poor application effects in the severe cold region of China.
Wei Xu, Changping Liu, An-Gui Li, Ji Li, Biao Qiao   +4 more
semanticscholar   +1 more source