CHAPTER 5:

23. How much electrical energy (in kWh) is needed to heat the water in a well-insulated electric hot water heater of capacity 40 gal from 20ºC to 50ºC (68ºF to 122ºF)? Use units of Btu/lb/°F. 24. How long will it take to heat 40 gal of water from 70(F to 120(F with a 20-kW immersion heater? Use units of Btu/lb/°F. 30. ................
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