Question

4. A coal-fired power plant has thermal efficiency, η = 30%. It produces 100 MW of power. does the coal combustor transfer energy (heat) to the plant? Answer: 100 MW At what 0 < 400 MH At what rate is heat rejected to the environment? Answer: 100 MW < Qく400 Mw. a. rate b.

Answer 1

Given that coal fired power plant: - efficiency eta = 30 5 power = 100 mw a) (heat) rate of coal combustor transfer energy. eta = o/p/I/p = Amount of power Generate/total coal consumed times CV of Coal heat rate = total Coal consumed times CV of Coal, eta = 100 MW/heat rate 30/100 = 100 times 1000 times KJ/dec/heat 30/100 = 100 times 1000 times 3600 KJ/hr/heat rate heat rate = 333.33 MW \r\n (b)At what rate heat rejected to environment heat rejected would be equal to difference between the heat added to the system minus power generated are out by the system so heat rejected rate = 333.33 - 100 heat rejection = 233.33 MW