Experimental study on electrical and thermal performance and heat transfer characteristic of PV/T roof in summer

Shao, Nina; Ma, Liangdong; Zhang, Jili

doi:10.1016/j.applthermaleng.2019.114276

Cited by 44 publications

(11 citation statements)

References 17 publications

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“…The flow rate of the circulation pump that transferred EGWM to the greenhouse: (27) The power of the circulating pump that pumps EGWM into the greenhouse can be calculated with the following equation:…”

Section: Energy Analysismentioning

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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Section: Energy Analysismentioning

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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“…Among the solar systems for residential applications for maximization of self-consumption, a common solution is the use of a reversible heat pump powered by PV (photo-voltaic) panels that supply the electricity needed to drive the compressor [13,14], or a heat pump connected to PV/T panels that can also supply the evaporation heat during winter season. This is highlighted by several authors considering different layouts, such as direct expansion [15], gas-driven [16], water-source [17], dual-source [18]. In warm climates, however, the only solution that allows having high solar fractions during the whole year is the use of solar-powered systems based on thermally driven heat pumps/chillers and sorption-based solid [19] or liquid systems [20].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Cascade Heat Pump and Thermal-Electric Energy Storage System for Residential Buildings: Experimental Testing and Performance Analysis

et al. 2021

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The need for innovative heating and cooling systems to decarbonize the building sector is widely recognized. It is especially important to increase the share of renewables at building level by maximizing self-consumption and reducing the primary energy demand. Accordingly, in the present paper, the results on a wide experimental campaign on a hybrid system are discussed. The system included a sorption module working as the topping cycle in a cascade configuration with a DC-driven vapor compression heat pump. A three-fluids heat exchanger with a phase change material (PCM), i.e., RT4 with nominal melting temperature of 4 °C, was installed on the evaporator side of the heat pump, for simultaneous operation as thermal storage and heat pumping purposes. The heat pump was connected to a DC-bus that included PV connection and electricity storage (batteries). Results showed that the energy efficiency of the heat pump in cascade operation was double compared to compression-only configuration and that, when simultaneously charging and discharging the latent storage in cascade configuration, no penalization in terms of efficiency compared to the compression-only configuration was measured. The self-sufficiency of the system was evaluated for three reference weeks in summer conditions of Athens climate and it was found that up to 100% of the electricity needed to drive the system could be self-produced for a modest cooling demand and up to 67% for the warmer conditions with high cooling demand.

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“…Solar photovoltaic/thermal (PV/T) collectors can simultaneously provide electricity and heat by fully exploiting the solar radiation lies in the entire solar spectrum (0.2-3 μm), among which the flatplate PV/T collector is the most common type due to its structural simplicity and building-integration easiness [1,2]. Water and air, as two of the accessible natural working fluids, are widely employed in the PV/T system to cool the solar cells and collect thermal energy [3,4].…”

Section: Introductionmentioning

confidence: 99%