Question

EXAM 3B 1. The Carnot heat engine receives 6500 kJ/h of heat from a boiler at 950 °C and rejects the waste heat to a well at 20°C. The produced power output of heat engine is fully used to operate the heat pump that draws the heat from the outdoor environment and transfers it to warm the house at the rate of 1100 kJ/min. If the house is maintained at 23°C, what is the lowest temperature of outdoor environment? (6 points)

Answer 1

TH= =23c 9500 THOUSE WNET 19220 to at Door HE 4 CARNOT HEAT ENGINE H.P. + " " pump * FROM HE. 20+253 WNET 3) 1 4020 Qu= 6500 65/6 = FAL, 15 punk 1. WHET = 62.380 185/ma From heat pump cop " THIL TH-TL WNET WNET Q1 = 1100 kJ/min :: Q1+ = Ql+ WNet - 23+2+3 1100 +420380 23 TL 82.380 OUTDOOR TEMPERATURE TL 2 2. 376°c