Comparison of solar collectors

A Rough Comparison between PV (photovoltaic solar panel) integrated with vapour compression and ETC (evacuated tube solar collector) integrated with thermal driven solar cooling systems has been conducted to estimate the cooling capacity that can be produced using an area of 100 m2 of each PV and ETC. It is found that for the same panels’ area, the ETC collector produces a slightly higher cooling capacity than the PV collector for thermal driven and vapour compression cooling systems, respectively under Kigali/Rwanda environmental conditions.
We estimated and compared the cost of a conventional vapour compression chiller / PV system and thermal driven adsorption chiller / ETC. A cooling capacity of 4.5 KW is considered for the cost estimation to meet the Cooling demand of an existing cold room under climate conditions of Rwanda for 24 /7 operation. The cost estimation included the initial cost for each system as well as to running and maintenance costs for a time-period of 25 years (this excluded pumps and control cost because they are existing in all systems). It is found that the adsorption / ETC chiller exhibits the lowest cost. Maintenance is a key cost factor vapour compression / PV system.

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