Thermal Analysis of a Newly Developed Solar-driven Agriculture Greenhouse

  • Tesfaldet Yohannes

Student thesis: Master's Thesis

Abstract

A novel agriculture greenhouse (GH) was developed as standalone and self-sufficient of energy and irrigating water. The new GH – Solar desalination system utilizes the surplus solar energy during the day (above that required for plants photosynthetic process) to produce the required irrigation water via solar desalination processes. A set of Transparent Photo Voltaic (TPV) panels are placed at the GH roof in an air recirculation channel (riser). TPV panels transmit part of the solar energy, convert part to electricity and absorb the rest and get heated. The circulating air in the risers cools the TPV and recovers thermal energy and thus improves the TPV electrical efficiency. The thermal energy, which is recovered by the circulating air, is then used in a Humidification De-Humidification (HDH) system for irrigating water production. Circulated air is humidified by saline water and then cooled through a chilled water condenser (HDH in the down comer channel). Cooled air is then mixed with ambient air in order to adjust its temperature and relative humidity and recirculated into GH. In this thesis, a theoretical model, based on energy balance for each component of the system, was developed in terms of environmental, design and operational parameters. Numerical simulation was carried out for a hot day (the average of the month of August) of Abu Dhabi, UAE. The system transient performance (temperature, relative humidity, air velocity, water productivity and electrical energy generation) was investigated. The results show that fresh water produced was 18.76 kg/d.m2 which is sufficient for GH irrigation demand. The electrical energy generated was 5.74 kWh/d. The effect of some design and operational parameters on the GH climatic condition was also studied.
Date of AwardJun 2013
Original languageAmerican English
SupervisorHassan Fath (Supervisor)

Keywords

  • Thermal Analysis; Agriculture Greenhouse; Humidification-Dehumidification; Solar Energy.

Cite this

'