a.Briefly define, in your own words, the meaning of the phrases “winter design temperature” and “heat loss coefficient (HLC)”.
2 marks
b.Briefly explain, in your own words, how degree-days and the heat loss coefficient (HLC) of a house can be used to estimate heating fuel bills.
2 marks
c.A couple are renovating a house with no functioning heating system. Fortunately, one of them has studied T313 and Study Guide 2 helped them work out the whole house heat loss coefficient (HLC) as 160 W K-1.
i.Estimate a suitable power output for the heating system, Qh. Assume an internal temperature of 20°C and a winter design external temperature of -5°C. Express your answer in kW to 2 significant figures.
2 marks
ii.Using the HLC value how many kWh per year of heat energy would be required if the annual total degree-days for the area in which the house is located is 3126? Assume data is supplied to 2 significant figures.
2 marks