DEVELOPING A SMALL-SIZE PROTOTYPE FOR SOLAR COOLING WITH ABSORPTION CHILLERS | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 19, Volume 32, Issue 1, January 2015, Page 339-360 PDF (1.93 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2015.98733 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| R. K. Mahmoud1; M. Z. El Attar2 | ||||
| 1Demonstrator, Ag. Eng. Dept., Col. Ag. Al-Azhar U., Assiut, Egypt. | ||||
| 2Lecturer, Ag. Eng. Dept., Col. Ag. Ain-Shams U., Egypt. | ||||
| Abstract | ||||
| A mixture of absorbent “water” and refrigerant “ammonia” fluids concentrated at 50% was used as a working fluid. The power source was a solar flat plate collector FPC with gross area of 1.90 m2. The FPC accumulates the collected solar energy in the generator vessel by the ammonia-water mixture. Two coaxial steel cylinders worked as condenser and evaporator. The outer cylinder circulates water to cool the system condenser in the condensing process. In the evaporating process (chilling), the outer cylinder is kept empty of water and the condenser cylinder works as evaporator. Experimental testing of the solar is assisted chiller was carried out for the evaluation of the system components and the overall thermal performance. Experiments were conducted in the Agricultural Engineering Department, Faculty of Agriculture, Al-Azhar University, Assiut branch, Assiut governorates, Egypt. It was found that the maximum system COP was 0.12 (0.04 ton of refrigeration load). This system can be used to cool three kilograms of potatoes crop from 30 °C to 4 °C under the experiment conditions, and 18 kilograms of potatoes can be cooled to 20 °C under the same conditions. In the average performance, the generator FPC delivered a 14.3% of the total available solar energy in one day. Meanwhile, generator vessel delivers 98% of FPC thermal energy or 13% from the total, solar intensity to the condenser-evaporator set. Net energy of the system condenser reached 55% form the energy delivered form generator vessel, and equals to 4.43 % from the total solar intensity. | ||||
| Keywords | ||||
| renewable energy; liquid flat plate collector; solar chilling | ||||
| References | ||||
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