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Zisheng Lu, Zaizhong Xia and Dong La Experimental study with operational solar-sorption cooling International Journal of Energy Research 37

Version of Record online: 29 OCT 2012 | DOI: 10.1002/er.2975

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(1) When the market of low-temperature solar collectors for heating has been matured, small silica gel-water adsorption chiller is adaptive, such as in Europe. When the average hot water inlet and outlet temperatures are 72.1 °C and 66.5 °C, the average cooling water inlet and outlet temperatures are 26.5 °C and 32.0 °C, and the chilled water inlet and outlet temperatures are 16.9 °C and 12.1 °C. The solar collector coefficient, cooling capacity and coefficient of performance (COP) are 0.36, 9.5 kW and o.44, respectively. The silica gel-water adsorption chiller can work for 8 h in one sunny day.

(2) In the developing market of solar heating and cooling, double-effect LiBr–H2O chiller with medium solar collector is more adaptive for large building because of low first investment and short payback period. The single LiBr–H2O absorption chiller was operated when the hot water temperature arrived at about 80 °C. The average cooling capacity and COP are 16.4 kW and 0.49. The producing cooling time is about 4.4 h in one sunny day, which is shorter than that of solar adsorption air-conditioning system.

(3) The double-effect LiBr–H2O chiller has been in mass production, and its cost is low. The new medium-temperature solar collectors can produce 120 –150 °C of hot water with high collector efficiency. The total solar COPs are about 0.5; 1 m2 of medium-temperature solar collector can cool 5 m2 of building area. Less solar collectors are used, so does the first invest and payback period.

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