QUESTION 4
(a)  An LPG appliance has an energy input of 5 kW. Calculate the gas rate in m3/hr for the appliance
given the heating value of LPG is 90 MJ/m3.
 Note: 1 kW = 3.6 MJ.
       
(2 marks)

(b)  A room measures 6 m by 4.5 m with a stud height of 2.7 m. Calculate the size of the space heater
required for the room, given that a heat output of 0.4 MJ /m3 of room volume is required for comfort
conditions.
(2 marks)

(c)  A commercial gas installation consists of 15 m of 50 mm diameter pipe, 30 m of 25 mm pipe, and
10 m of 15 mm pipe. Calculate the total volume of the pipework for purging and testing purposes.
Give your answer in litres.
(3 marks)
  Total 7 marks


Linkback: https://www.plumbers.nz/gas-exam-2006/20/question-4/150/