scholarly journals Solar assisted heat pump system with volume solar collector. Technical report

1978 ◽  
Author(s):  
J.S. Sabnis ◽  
W.J. Hickox ◽  
E.E. Drucker ◽  
M. Ucar ◽  
J.E. LaGraff
Keyword(s):  
Heat Pump ◽  
Solar Collector ◽  
Pump System ◽  
Heat Pump System ◽  
Technical Report

scholarly journals Designing and Optimizing Heat Storage of a Solar-Assisted Ground Source Heat Pump System in China

2020 ◽  
Vol 2020 ◽  
pp. 1-18 ◽  
Author(s):  
Yan Gao ◽  
Zhi Sun ◽  
Xinxing Lin ◽  
Chuang Wang ◽  
Zongyu Sun ◽  
...  
Keyword(s):  
Soil Temperature ◽  
Heat Pump ◽  
Solar Collector ◽  
Heat Storage ◽  
Ground Source Heat Pump ◽  
Cold Region ◽  
Annual Average ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source

The cold accumulation problem can lead to performance degradation of heat pumps. This paper presents the design and optimization of a solar-assisted storage system to solve this issue. A ground source heat pump (GSHP) project was established using the transient system simulation program (TRNSYS) based on a ground heat exchange theoretical model, which was validated by a previously established experiment in Beijing. The Beijing, Harbin, and Zhengzhou regions were used in numerical simulations to represent three typical cities where buildings require space heating (a cold region, a severe cold region, and a hot summer and cold winter region, respectively). System performance was simulated over periods of ten years. The simulation results showed that the imbalance efficiencies in the Beijing, Harbin, and Zhengzhou regions are 55%, 79%, and 38%, respectively. The annual average soil temperature decreases 7.3°C, 11.0°C, and 5.3°C during ten years of conventional GSHP operation in the Beijing, Harbin, and Zhengzhou regions, respectively. Because of the soil temperature decrease, the minimum heating coefficient of performance (COP) values decrease by 23%, 46%, and 11% over the ten years for GSHP operation in these three regions, respectively. Moreover, the simulation data show that the soil temperature would still be decreasing if based on the previous solar energy area calculation method. Design parameters such as the solar collector size are optimized for the building load and average soil temperature in various cold regions. Long-term operation will test the matching rate of the compensation system with the conventional GSHP system. After the system is optimized, the solar collector area increases of 20% in the Beijing region, 25% in the Harbin region, and 15% in the Zhengzhou region could help to maintain the annual average soil temperature balance. The optimized system could maintain a higher annual average COP because of the steady soil temperature. It provides a method for the design of a solar collector area which needs to be determined in the seasonal heat storage solar ground source heat pump system.

Determination of Heat Transfer Characteristics of Solar Thermal Collectors as Heat Source for a Residential Heat Pump

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Maarten G. Sourbron ◽  
Nesrin Ozalp
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Low Temperature ◽  
Heat Source ◽  
Heat Pump ◽  
Solar Collector ◽  
Heat Transfer Characteristics ◽  
Pump System ◽  
Heat Pump System ◽  
Temperature Heat

With reducing energy demand and required installed mechanical system power of modern residences, alternate heat pump system configurations with a possible increased economic viability emerge. Against this background, this paper presents a numerically examined energy feasibility study of a solar driven heat pump system for a low energy residence in a moderate climate, where a covered flat plate solar collector served as the sole low temperature heat source. A parametric study on the ambient-to-solarfluid heat transfer coefficient was conducted to determine the required solar collector heat transfer characteristics in this system setup. Moreover, solar collector area and storage tank volume were varied to investigate their impact on the system performance. A new performance indicator “availability” was defined to assess the contribution of the solar collector as low temperature energy source of the heat pump. Results showed that the use of a solar collector as low temperature heat source was feasible if its heat transfer rate (UA-value) was 200 W/K or higher. Achieving this value with a realistic solar collector area (A-value) required an increase of the overall ambient-to-solarfluid heat transfer coefficient (U-value) with a factor 6–8 compared to the base case with heat exchange between covered solar collector and ambient.

Performance Optimization and Parametric Design of an Irreversible Solar-Driven Three Source Heat Pump

2009 ◽  
Author(s):  
Houcheng Zhang ◽  
Lanmei Wu ◽  
Guoxing Lin
Keyword(s):  
Heat Pump ◽  
Solar Collector ◽  
Parametric Design ◽  
Working Fluid ◽  
Heat Sources ◽  
Pump System ◽  
Heat Pump System ◽  
Radiation Heat Loss ◽  
And Performance ◽  
Internal Irreversibility

An irreversible solar-driven heat pump system operating among three heat sources at different temperatures is investigated, in which not only finite-rate heat transfer between the cycle working fluid and the three heat sources but also the internal irreversibility inside the cyclic working fluid, the radiation heat loss of the solar collector are taken into account. Based on thermodynamics analysis method and the optimal control theory, the relation between the overall coefficient of performance (COP) of the solar-driven three source heat pump system and the operating temperature of the solar collector is derived. An optimal matching between the solar collector and the three source heat pump is determined and the optimal operating temperature of the solar collector is explored. Furthermore, the influences of the radiation heat loss of the collector, the internal irreversibility and the comprehensive factor, etc. on the performance characteristic of the solar-driven three source heat pump system are analyzed and evaluated. By means of the numerical value calculation, the optimal design parameters and performance characteristics of the solar-driven three source heat pump system are discussed in detail. The results obtained may provide some theoretical references for the parametric design and performance evaluation of solar-driven absorption/adsorption heat pumps.

Heating Performance Investigations on Two Applications of a Solar Assisted Air Source Heat Pump System

2011 ◽  
Vol 374-377 ◽  
pp. 284-287 ◽  
Author(s):  
Yu Wang ◽  
Yu Wen You ◽  
Zhi Gang Zhang
Keyword(s):  
Heat Pump ◽  
Solar Collector ◽  
Coefficient Of Performance ◽  
Experimental Investigations ◽  
Pump System ◽  
Heat Pump System ◽  
Heating Performance ◽  
Air Source Heat Pump

A solar assisted air source heat pump (SAASHP) system is proposed to improve heating performance of air source heat pump (ASHP).The proposed system has been applied in two buildings, a series of experimental investigations were conducted in the both applications, it indicated that the SAASHP system gets better heating performance than ASHP system, the coefficient of performance (COP) gets 10% and 65% increase respectively in two applications. It is also concluded that the ratio of solar collector area to construction area significantly affects the improvement of heating performance in SAASHP system. This work may promote further research and more applications of SAASHP system.

scholarly journals The Solar-Assisted Vertical Ground Source Heat Pump System in Cold Climates—A Case Study

Proceedings ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. 24
Author(s):  
Piotr Rynkowski
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Solar Collector ◽  
Heat Extraction ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Vertical Ground

In this paper, experimental studies were performed for a solar ground source heat pump system (SGSHPS) with a vertical ground heat exchanger (VGHE). The experiment was operated during the summer in 2018. The heat from the solar collector was monitored by measuring the inlet and outlet temperatures and flow rate of the heat transfer fluids. An energy equilibrium balance carried out indicates heat extraction from the solar collector to the ground heat exchanger. It has been established that clear impact is achieved within a radius of 5 m. The average temperature of the actively regenerated borehole was higher than that of the undisturbed profile, which has a direct impact on the significant benefits of the coefficient of performance (COP) of the ground source heat pump system (GSHPS) and effectively helps soil regeneration. The average efficiency ratio of the heat transferred from solar radiation to soil in the SGSHPS was 42.3%.

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