FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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A cold storage is to be maintained at -10°C while the surroundings are at 25°C. The heat leakage from the surroundings into the cold storage is estimated to be 35 kW The actual COP of the refrigeration plant is one-forth of an ideal plant working between the same temperatures. Find the power required to drive the plant
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A heat pump shown is driven by 3.0 MW motor and receives heat from a source at 60C and
deliver energy to a boiler that operates at constant pressure and saturation temperature of 140
C. The water enters the boiler as saturated liquid and leaves as saturated vapor at the same
temperature. The heat pump operates with a COP (coefficient of performance) that is 60% of a
Carnot heat pump COP.
Find : 1- the maximum mass flow rate of water the system can deliver
2- the heat received from the source Q,
boiler
mter
TH
VHP - w
T 60°C
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- If 14 gpm of water is flowing through an open-loop heat pump with a temperature difference of 7F, how much heat in Btu/h is being absorbed or rejected in the heat pump? Show all work and units.arrow_forwardRefrigerant-134a enters the condenser at 200 kPa and 100C and it leaves at 200 kPa with a quality of 45 percent in a heat pump. The load of heat pump is 700 W and COP of the heat pump is 3.5, determine The rate of heat gains from the environment The minimum compressor work The mass flow rate of the refrigerantarrow_forwardAn air-conditioning absorption system has an evaporator capacity of 350 kW with a COP of 0.90 operating at a temperature of 25 C with a condensing temperature of 35 C. The same cooling tower was used to reject the heat from the condenser and the absorber operating 45 C & providing 1 kg/s of water plus lithium bromide solution to the generator. Consider the heat rejection ratio of condenser to evaporator is 1.05, Determine the following: 1. Heat given by the generator & the size of condenser in kW 2. Leaving condenser & evaporator enthalpies & the mass of refrigerant water flowing from the generator to the condenser then to the evaporator & to the absorber (using evaporator heat balance). 3. Weight of lithium bromide in kg/s, concentration in percent & enthalpy from the absorber to the generator in kJ/kg 4. Enthalpy from the generator to condenser in kJ/kg (using condenser heat balance) & concentration in percent & enthalpy from generator to absorber…arrow_forward
- In a refrigerator the power rating impressed on the compressor is 1.2 kW. Thecirculating wire in evaporator is 5 kW and the cooling water took away 10 kW fromcondenser coil. The operating temperatures range is 18ºC and 0ºC and theircorresponding latent heats are 170 kJ/kg and 230 kJ/kg and the difference between theliquid energy is 35 kJ/kg. Find the actual COP of the system (2) relative COP, assumingthe vapour is just dry and saturated at the end of the compression.arrow_forwardA heat pump shown is driven by 2.5 MW motor and receives heat from a source at 80 C and deliver energy to a boiler that operates at constant pressure and saturation temperature of 130 C. The water enters the boiler as saturated liquid and leaves as saturated vapor at the same temperature. The heat pump operates with a COP (coefficient of performance) that is 70% of a Carnot heat pump COP. Find: 1- the maximum mass flow rate of water the system can deliver 2- the heat received from the cold source Q, boiler mwater eb TH V HP 2.5 MW TL=80°Carrow_forwardSince Lucas is an engineer familiar with thermodynamics. He decided to create his own heat engine at home to avoid paying for electricity. He created a small, makeshift heat engine for trial. The combustion of his fuel. diesel, reaches a temperature of 750°C, while waste heat is disposed to the atmosphere at 50°C. He, then connected a generator and a heat pump to the heat engine to check the amount of power being produced. Assume that the heat pump will be used to warm his room to 25°C, while the outside temperature is at 5°C. Lucas' rooms loses 85,000 kJ/hr of heat. And, 25% of the heat engine's power output goes to the heat pump. How much diesel (in kg) needs to be burned by the heat engine to maintain the temperature in Lucas' room? Assume carnot heat engine and heat pump. If the natural gas has a heating value of 22,000 BTU/lb.arrow_forward
- In a refrigerator the power rating impressed on the compressor is 1.2 kW. The circulating wire in evaporator is 5 kW and the cooling water took away 10 kW from condenser coil. The operating temperatures range is 18ºC and 0ºC and their corresponding latent heats are 170 kJ/kg and 230 kJ/kg and the difference between theliquid energy is 35 kJ/kg. Find the actual COP of the system (2) relative COP, assuming the vapor is just dry and saturated at the end of the compression.arrow_forwardI need answer in handwrittenarrow_forwardConsider the refrigerator shown in Figure. If the compressor consumes 850 W of power and the COP of the refrigerator is 2.5 determine. The mass flow rate of the refrigerant The rate of heat rejected to the kitchen air Condenser Expansion Xvalve Wn Compressor Evaporator 100 kPa 100 kPa x0.2 -26°Carrow_forward
- i need the answer quicklyarrow_forwardThe 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.arrow_forwardPineapple fruits with a mass of 500 kg are supplied to a cold storage at 20 C. The cold storage is maintained at 5 C and the fruits get cooled to a storage temperature in 10 hours. The latent heat of freezing is 105 kJ/kg and the specific heat of fruit is 1.256 kJ/kg.K. Find the refrigeration capacity of the plant.arrow_forward
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