Question 2 (1) Explain, using a neat sketch, working principle of a solar water heating [5 marks] system. (ii) Estimate the hot water energy demand for a family of four, with medium [3 marks] normal consumption (i.e. per person : 40 liter/day), cold water mains supply of 18C, and water distribution temperature of 45C.(take density of water as 1000 kg/m3 and specific heat of water as 4.18 KJ/kg.K). (1) How does a solar thermal power plant generate electricity? explain with a [5 marks] neat sketch (iv) A PV system is using 80 W, 12 V panels and 6 V, 155 Ah batteries in an area [7 marks) of unshaded sunshine. The battery efficiency is 73% and the depth of discharge is 70%. If, in wintertime, there are 5 hours of daylight, estimate the number of PV panels and batteries required for a 24 V application with a load of 2600 Wh /day and three days of storage