Chapter 5, Problem 5.109EP

A heat engine with a thermal efficency of 45% rejects 500kJ/kg of heat. How much heat does it recieve?

Room (A) contains only an air conditioner with 6 KW capacity that works 3 hours per dayRoom (B) contains only a refrigerator with 0.9 KW that works 20 hours per day .which of the two rooms would get higher electricity bill by the end of day

The heat removal rate from a refrigerated space and the power input to the compressor are 8.5 kW and 1.7kW respectively. Cop of the refrigerator.

An air conditioner with COP~2.8 cools a well-sealed house from 35°C to 22°C in 10 min. Please determine the power consumption of the air conditioner. Assume the entire mass of air within the house is equivalent to 800 kg, and specific heats at 300K can be used. Also plot the schematic of the air conditioner with heat reservoirs, all heat transfers and work transfer.

A heat pump receives energy from a source at 80∘C and delivers energy to a boiler that operates at 350 kPa. The boiler input is saturated liquid water and the exit is saturated vapor, both at 350 kPa. The heat pump is driven by a 2.5-MW motor and has a COP that is 60% that of a Carnot heat pump. What is the maximum mass-flow rate of water the system can deliver?

A heat engine has a thermal efficiency of 70%. During each cycle the engine does 400J of work. What is the magnitude of waste heat rejected to the low temp reservoir?

A window-mounted air conditioner removes 2.1 kJ from the inside of a home using 1.75 kJ work input. What is its coefficient of performance? Note: thermodynamically, and air conditioner is the same thing as a refrigerator - it makes the inside of a container (house, refrigerator) colder.

Please consider an actual heat engine that was taking in steam at 700 °FF and 400 psia at the rate of 1.0 lbm/sec. The engine was rejecting steam at 500 F and 100 psia. The engine's efficiency was 32 % of the Carnot efficiency. 4. a. Please determine the efficiency for a Carnot Engine that was operating between Tiand T. of the actual engine. b. Please determine the power output of the actual engine in hp.

A refrigerator absorbs 137 kJ/kg of heat from a cool compartment at -10°C and rejects heat to the kitchen air at 30 °C. The amount of work supplied to the refrigetator is 54 kJ/kg. i) Sketch the schematic diagram of the refrigerator system. ii) Calculate the COP of the refrigerator. iii) Determine whether this refrigerator is reversible, irreversible or impossible. iv) If the refrigerator is used as a heat pump, determine the COP of the heat pump.