scholarly journals Modeling and Coordinated Control of an Air-Source Heat Pump and Hydronic Radiant Heating System

2019 ◽  
Author(s):  
Christopher R. Laughman ◽  
Scott A. Bortoff ◽  
Hongtao Qiao
Keyword(s):  
Heat Pump ◽  
Coordinated Control ◽  
Heating System ◽  
Radiant Heating ◽  
Air Source Heat Pump

Performance comparison of capillary mat radiant and floor radiant heating systems assisted by an air source heat pump in a residential building

2016 ◽  
Vol 26 (9) ◽  
pp. 1292-1304 ◽  
Author(s):  
Min Zhao ◽  
Weibin Kang ◽  
Xilian Luo ◽  
Chuck Wah Yu ◽  
X. Z. Meng ◽  
...  
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Residential Building ◽  
Heating System ◽  
Performance Comparison ◽  
Coefficient Of Performance ◽  
Radiant Heating ◽  
Heating Systems ◽  
Air Source Heat Pump ◽  
Supply Water

The radiant heating system assisted by an air source heat pump has been widely applied in China for its effective energy conservation, high comfort performance and flexible utilization. Because the coefficient of performance of the system is strictly controlled by the supply water temperature heated by the air source heat pump, an efficient radiant terminal with low-temperature supply water is of significance to the coefficient of performance. In this research, the energy-saving feature of the capillary mat radiant heating system was first proved theoretically based on the influence of the heat transfer temperature difference on the coefficient of performance of the air source heat pump. In order to compare the performances of the capillary mat radiant and floor radiant heating systems, an experiment platform of two different radiant terminals assisted by an air source heat pump was established in a residential building in Xi’an, China. Experimental results showed that, to satisfy the indoor heating requirements, the supply and return water temperatures ought to be 35.0℃ and 30.9℃, respectively, and for the capillary mat radiant heating system, 43.9℃ and 38.8℃, respectively, for the floor radiant heating system. However, the electricity consumption of the capillary mat radiant heating system is 45% less than that of the floor radiant heating system. Thus, our study validated the energy-saving potential of the capillary mat radiant heating system assisted by an air source heat pump.

The Study on the Energy Saving of Wall Mounted Solar Capillary Low-Temperature Hot Water Radiant Heating System

2014 ◽  
Vol 1008-1009 ◽  
pp. 54-57
Author(s):  
Xue Jun Li ◽  
Xiao Yan Luo ◽  
Chuan Qi Xu ◽  
Jin Shun Wu ◽  
Song Pan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Pump ◽  
Heating System ◽  
Hot Water ◽  
Radiant Heating ◽  
Capillary System ◽  
Air Source Heat Pump ◽  
Heat Collector ◽  
Collector Temperature ◽  
Collecting Efficiency

Through the comparative study of solar capillary low-temperature hot water radiant heating system with air source heat pump system has found that solar energy heat collecting efficiency has a great relationship with the collector temperature for the given system. To reduce the temperature of solar heat collector circulating water can greatly improve the heat collecting efficiency of the heat collector .With the increase of temperature of the water in the heat collector, heat collecting efficiency decrease rate changes linearly. Increasing water storage can improve the heat collecting efficiency, for this heat collecting system, the optimum collector temperature is 32 °C. In this study, COP reached 5 when the low temperature solar hot water capillary system mode is being used, and this result is nearly 5 times higher than that of the air source heat pump mode . Using the low temperature solar water heating capillary system, 27.35 kwh / (m2 ·heating season) of electricity can be saved compared with the amount of electricity consumed by air source heat pump. According to the price of current Beijing city , the estimated period of investment payback is 4.8 years .

scholarly journals Technical Characteristics in the Diffusion of Cleaner Residential Heating System in China: The Case of Air-Source Heat Pump Technology

2019 ◽  
Vol 12 ◽  
pp. 194008291985591 ◽  
Author(s):  
Dejin Su ◽  
Wenli Zhou ◽  
Qixia Du ◽  
Yongchun Huang
Keyword(s):  
Product Design ◽  
Heat Pump ◽  
User Satisfaction ◽  
Linear Regression Analysis ◽  
Heating System ◽  
Product Knowledge ◽  
Total Cost ◽  
Positive Effects ◽  
Air Source Heat Pump ◽  
Residential Heating

This study aims to explore the technical characteristics that affect user satisfaction with air-source heat pump technology which is recognized as one typical cleaner residential heating system and being promoted in China in response to the national “coal to electricity” policy. Moderated hierarchical linear regression analysis was conducted to analyze data from a questionnaire survey of 256 residents in suburban Beijing. Empirical results indicated that product convenience, product design, product reliability, product knowledge, and total cost, respectively, affect user satisfaction, but product safety has no significant effect on user satisfaction. Meanwhile, total cost is an important contingent factor that might weaken the positive effects of product convenience (or product design) on user satisfaction. Our research provides empirical evidence for identifying factors that influence user satisfaction with cleaner residential heating system in response to new energy policy and further provides useful managerial implications for market practice.

Performance analysis and optimization of a solar-air source heat pump heating system in Tibet, China

2020 ◽  
Vol 220 ◽  
pp. 110084 ◽  
Author(s):  
Tianhe Long ◽  
Zhenyong Qiao ◽  
Meilin Wang ◽  
Yongcai Li ◽  
Jun Lu ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Heat Pump ◽  
Heating System ◽  
Air Source Heat Pump

scholarly journals Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2642 ◽  
Author(s):  
Yi Zhang ◽  
Guanmin Zhang ◽  
Aiqun Zhang ◽  
Yinhan Jin ◽  
Ruirui Ru ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Operating Cost ◽  
Heating System ◽  
Coefficient Of Performance ◽  
Outdoor Air ◽  
Pump System ◽  
Heat Pump System ◽  
Reduce Operating Cost ◽  
Air Source Heat Pump

Frost layer on the outdoor air heat exchanger surface in an air-source heat pump (ASHP) can decrease the system coefficient of performance (COP). Although the common defrosting and anti-frosting methods can improve the COP, the periodic defrosting not only reduces the system energy efficiency but also deteriorates the indoor environment. To solve these problems, it is necessary to clearly understand the frosting phenomenon and to achieve the system frost-free operation. This paper focused firstly on the analyses of frosting pathways and frosting maps. Followed by summarizing the characteristics of frost-free technologies. And then the performances of two types of frost-free ASHP (FFASHP) systems were reviewed, and the exergy and economic analysis of a FFASHP heating system were carried out. Finally, the existing problems related to the FFASHP technologies were proposed. Results show that the existing frosting maps need to be further improved. The FFASHP systems can not only achieve continuous frost-free operation but reduce operating cost. And the total COP of the FFASHP heating system is approximately 30–64% higher than that of the conventional ASHP system under the same frosting conditions. However, the investment cost of the FFASHP system increases, and its reliability also needs further field test in a wider frosting environment. In the future, combined with a new frosting map, the control strategy for the FFASHP system should be optimized.

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