The evacuated tube solar collector assisted heat pump for heating greenhouses
| Autor: | Yilian Tang, Reda Hassanien Emam Hassanien, Ming Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Thermal efficiency
Payback period business.industry 020209 energy Mechanical Engineering Environmental engineering Greenhouse 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Solar energy law.invention law Electric energy consumption 0202 electrical engineering electronic engineering information engineering Environmental science Relative humidity Electrical and Electronic Engineering 0210 nano-technology business Thermal energy Civil and Structural Engineering Heat pump |
| Zdroj: | Energy and Buildings. 169:305-318 |
| ISSN: | 0378-7788 |
| DOI: | 10.1016/j.enbuild.2018.03.072 |
| Popis: | Using the solar energy for greenhouse heating can reduce both CO2 emissions and heating costs. Thus, the aim of this study was to investigate the performance and viability of using an evacuated tube solar collector as a solar water heater assisted an electric heat pump for greenhouse heating. The experiment has been conducted in twin experimental greenhouses installed in Kunming, China. The required energy for heating the greenhouse was calculated. Moreover, the microclimatic conditions in greenhouses under different local weather conditions, the produced thermal energy, and electric energy consumption were analyzed. The efficiency of the solar collector was determined and the effectiveness of the evacuated tube solar collector with the electric heat pump was also examined. Results revealed that the internal air temperature in the heated greenhouse exceeds the temperature inside the unheated (control) greenhouse by 2 °C–3 °C, whereas, the relative humidity decreased by 10% in the heated greenhouse. Furthermore, the thermal efficiency of the solar collector and the payback period were 0.49 and 4.1 years, respectively. In conclusion, this integration could provide more than 35% of the total required heat for greenhouse. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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