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The result from Fig. 5, the fluid with highest outlet temperature is water which has temperature of eight collectors’ outlet is 110.2oC and second highest is ethanol at 94°C. This is because of water has highest boiling point at 100°C is higher than ethanol at 56°C. The water changes from liquid to steam at 100 ° C, while ethanol becomes vapour at 56 ° C. From Fig. 5, water become vapour after flowing through two collectors, meanwhile ethanol, R134a and R600a become vapour phase before passing through second collector.
CONCLUSION
In conclusion, R600a have highest efficiency of collector and mass flow rate, but temperature outlet collector is lowest than others fluid. Water have second highest efficiency of collector and mass flow rate, but temperature outlet collector is highest than others fluid. If more collectors are used, the collector area will increase and the collector efficiency will decrease. If the fluid has a lower specific heat and moderate pressure in the system, it will increase mass flow rate. If the fluid has only the highest specific heat value and there is no pressure in the system, it can also affect the lower mass flow. Finally, if more collectors are used, the outlet temperature of collector will also increase.
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