Asteady-state heat pump cycle is used to heat a home. the interior of the home is maintained at 20 c and the heat pump receives a heat transfer from ground well water at 0c while discharging heat to the house at the rate of 120,000 kj/h. over a period of 7 days, an electric meter records that 700 kwh of electricity is provided to the heat pump. (a) determine the amount of energy that the heat pump receives over the 7-day period from the well water by heat transfer, in kj. (b) find the coefficient of performance of the heat pump. (c) calculate the coefficient of performance of a reversible heat pump cycle operating between hot and cold reservoirs at 20c and 0c

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above