THERMAL PERFORMANCE EVALUATION OF RENEWABLE HYBRID ENERGY SOURCES FOR HEATING GREENHOUSES | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 6, Volume 5, Issue 4, April 2014, Pages 497-513 PDF (1.08 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2014.49341 | ||
| Authors | ||
| S. M. Abdellatif; Y. M. Y. M.; A. H. Silim | ||
| Agricultural Engineering Department, Faculty of Agriculture, Mansoura University, Egypt | ||
| Abstract | ||
| The interest in alternative or renewable heat energy sources for greenhouses heating is currently high, due to the large burden of heating and the relatively high price of fossil fuels. The objective of this study is to analyse the thermal performance of hybrid system; solar energy and biomass greenhouse heating system (SBGHS). This study experimentally investigates the total burden of heating required for commercial greenhouse (1010.4 m3) heating by solar and biomass heat energy under the climatic conditions of eastern region of costal Delta, Egypt (latitude angle of 31º 02' 41" N, longitude angle of 31º 21' 55" E, and mean altitude above sea level of 6 m) during winter season of 2012-2013. The thermal performance analysis was experimentally determined, by measuring the temperature increase at various water inlet temperatures and intensity of solar radiation, under clear sky conditions. A complete solar heating system (six solar collectors and storage tank) was utilised for heating 1500 litres of solution (water and antifreeze). The daily average overall thermal efficiencies of the solar heating system and the storage system during the heating period, respectively, were 83.19% and 95.51%. Over 147 days heating season the solar heating system collected 9 222 kWh of which 8 830 kWh (31.788 GJ) of solar power was stored in the storage tank. It provided 27.47% of the total power required by the greenhouse. The biomass heating system added 145.136 kWh (522.490 MJ) of heat energy into the greenhouse which provided 66.37% of total power required for greenhouse heating. The hybrid heating system provided 205.206 kWh (93.84%) of the daily total heat energy required. The economics of such a system remains marginal at present power prices in Egypt, although changes in power costs may drastically alter the situation. | ||
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