(CD-ROM)
A heat pump maintains a dwelling at temperature T when the outside temperature averages 5°C. The heat transfer rate through the walls and roof is 2000 kJ/h per degree of temperature difference between the inside and outside. If electricity costs 8 cents per
(a) determine the minimum theoretical operating cost for each day of operation when T = 20°C.
(b) plot the minimum theoretical operating cost for each day of operation as a function of T ranging from 18 to 23°C.