Question

QUESTION 1) A 9kg bottle of LPG is to be used to heat water in a domestic system. The incoming water is at 10°C and must be heated to 64°C with an efficiency of 82%. The calorific value of the gas is 40MJ/kg. Determine the mass of water that can be heated.

question 2). An office heating system uses flat radiator panels to warm the space. The surface temperature of the radiator is 80°C. Using h=32W/m2, ε=0.85, room temp is 22°C and the surface area is 3m2 determine; (2 marks each)

i) The transfer by convection ii)

The transfer by radiation iii) The total heat transfer

PLEASE ANSWER BOTH QUESTIONS

Answer 1

ANSWER 1: Mass of water that can be heated is 1935.73 kg of water

ANSWER 2:

1. Heat transfer by convection is 5568 Watts
2. Heat transfer by radiation is 1150.04 Watts
3. Total heat transfer is 6718.04 Watts

PLEASE UPVOTE, THANKS IN ADVANCE!!