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A solar collector is to be mounted on a south-facing roof, feeding a storage tank of capacity 200 litres. The circulating pump operates at 20

A solar collector is to be mounted on a south-facing roof, feeding a storage tank of capacity 200 litres. The circulating pump operates at 20 106 m3/s. On a typical day, the difference of water temperature between the collector output and input is 17.2C and lasts for 6.8 hours. If the temperature of the water in the storage tank is increased by 13.75C, what is the thermal efficiency of the system?

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