Experimental investigation on the performance of direct-expansion roof-PV/T heat pump system

Shao, Nina; Ma, Liangdong; Zhang, Jili

doi:10.1016/j.energy.2020.116959

Cited by 58 publications

(16 citation statements)

References 28 publications

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“…The thermal efficiency 25 (g th ) is computed from equation (3) which is a useful heat gain to the product of incident solar radiation (G) and area of the PV (A pvt ). While the overall efficiency 25,28 g o is computed by equation (4) and g p represents the power generation efficiency of the conventional power plant and its reference value is taken as 0.38.…”

Section: Performance Analysis Methodsmentioning

confidence: 99%

“…The integration of the rollbond aluminum heat exchanger with the PV module showed better surface contact and adequacy to the PVT evaporator. 26 Recently, the idea of integrating the above-mentioned technology into the building envelope was also proposed in the literature such as; Shao et al 27,28 proposed a novel PVT evaporator roof system that serves as the building's outermost skin. Liang et al 29,30 examined an opaque ventilated PV evaporator fac¸ade being the outermost skin, which utilized the refrigerant pump during summer for useful heat gain and minimizing the thermal impacts within the air cavity.…”

Section: Introductionmentioning

confidence: 99%

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Performance study on photovoltaic thermal building façade component in multi-energy generation during winter

Riaz

Zhou

Liang

et al. 2021

Building Services Engineering Research and Technology

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Photovoltaic thermal systems have gained tremendous popularity in the production of electric and thermal energy. In this paper, the photovoltaic thermal modules for the building façade assisted by heat pump system is proposed which combines the photovoltaic modules with an evaporator part of the heat pump system to produce hot water and electrical energy. Also, the photovoltaic thermal panels are used to preheat the cold ambient fresh air without heat pump operation. The proposed system was constructed at the Institute of Building Energy, Dalian University of Technology, China to study the ambient fresh air heating characteristic, electrical power generation, and hot water generation through performance evaluation indices under natural weather conditions. It was found that the average electrical, thermal, and overall efficiencies are 8.8%, 26%, and 50%, respectively during the pre-heating of fresh air. While the average air temperature is 15.2°C inside an air gap. The average COP for water heating is 3.91 during the water heating mode. This study could be used as a guide for photovoltaic thermal solar-assisted heat pump systems on building envelopes in a multi-energy generation under different weather conditions. Practical application: The study considers the photovoltaic thermal modules for building façade not only to generate the electrical energy and pre-heated fresh air but also to generate the hot water when assisted with the heat pump system. This research could assist researchers and engineers in the field of photovoltaic thermal façade systems in multi-energy generation such as for the production of electricity, heated/cooled fresh air, and hot water generation.

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Section: Performance Analysis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance study on photovoltaic thermal building façade component in multi-energy generation during winter

Riaz

Zhou

Liang

et al. 2021

Building Services Engineering Research and Technology

Self Cite

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“…Use of PCMs as heat storage units has been gaining more attention in recent years. Youssef SAHP systems [95]- [101], [103], [110]. Calise et al [95] carried out a numerical simulation and an economic investigation of a PV/T enhanced SAHP system for domestic space heating and cooling, and hot water provision.…”

Section: Increasing Interest In Pcm Storagementioning

confidence: 99%

A chronological review of advances in solar assisted heat pump technology in 21st century

Бадией

Akhlaghi

Zhao

et al. 2020

Renewable and Sustainable Energy Reviews

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This paper presents a comprehensive review on developments and advances of Solar Assisted Heat Pump technology reported in 21 st century. Combination of thermal and photovoltaic solar collectors with heat pumps has been widely used in recent decades for simultaneous heat, hot water and power generation for a broad range of applications, from providing domestic and commercial buildings with heat and power to manufacturing and agricultural applications. This review critically analyses the research reported in past two decades with particular attention to the works with substantial importance for future development of the technology. Four distinctive investigation periods were considered and key developments and dominant technologies at each period were reported. The main novelties and breakthroughs in solar assisted heat pump technology, as identified by this review, are: (1) The ban on R-12 refrigerant which lead to dominance of R-134A refrigerant for a wide range of systems and applications, (2) Increasing interest in Solar-assisted Ground Source Heat Pumps following the technological advances that made the utilization of such systems cost effective, (3) Advances in numerical analysis methods and use of Artificial Intelligence applications in investigating performance and effectiveness of various systems, and (4) Integrating the Photovoltaic/Thermal collectors with heat pumps for simultaneous heat and power generation resulting in improved performance and reliable operation of systems under severe operating conditions. Highlights• Four distinctive investigation periods from 2000 to 2020 are considered • Key developments and prevailing breakthroughs at each period are presented • Advantages and shortcomings of each study are discussed • Different types of SAHPs, applications, and performances are investigated

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“…Type of System COP Year [28] Water source heat pump 4.9 2019 [29] Ethylene glycol water mix source heat pump 5 2020 [30] Water source heat pump 5.9 2020 [31] Water source heat pump 4.24 2018 [32] Ethylene glycol water mix source heat pump Winter 7.4 / Summer 6.5 2017 [33] Water source heat pump 5 2020 [34] Water source heat pump 4.9 2019 Table 4 shows that the average COP values of water source and ethylene glycol water mix source heat pump systems are between 4.24 and 7.4. This means that these heat pump systems can produce at least 4.24 times more heat than the electricity they consume.…”

Section: Referencesmentioning

confidence: 99%

Design of an innovative PV/T and heat pump system for greenhouse heating

Koşan

Akkoç

Dişli³

et al. 2020

Journal of Energy Systems

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The very high annual heat demand of greenhouses is the most critical factor that increases production costs. Conventional methods are generally used to obtain the optimum temperature required for greenhouses. In these systems, greenhouse air is heated by a boiler and pipe networks are connected to it, and in this way, most of the heat energy is transferred from the greenhouse ceiling to the atmosphere. In addition, in the greenhouse, not only the air but also the soil should be heated in order not to spoil the roots of the plants. The objective of this research is to provide sustainable heating for greenhouse applications. For this purpose, an innovative heating system has been designed for greenhouse heating by using of solar energy and heat pump technologies. In this study, a new approach was presented by designing a novelty heat pump flow for the heat required in the greenhouse. With this design, not only greenhouse air but also the soil will be heated and the best conditions for the development of plants will be provided. In the system, an ethylene glycol water mixture was used to prevent damage caused by freezing. In addition, it is designed to provide sustainability with an auxiliary heater when solar radiation is insufficient. It is highly recommended to apply this presented system for all greenhouse types.

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Experimental investigation on the performance of direct-expansion roof-PV/T heat pump system

Cited by 58 publications

References 28 publications

Performance study on photovoltaic thermal building façade component in multi-energy generation during winter

Performance study on photovoltaic thermal building façade component in multi-energy generation during winter

A chronological review of advances in solar assisted heat pump technology in 21st century

Design of an innovative PV/T and heat pump system for greenhouse heating

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