The heat pump with a power input of 2000 kW draws heat from a heat source at 70 ° C and gives heat to a boiler. Thanks to the heat given to the boiler, the saturated liquid water entering the boiler at 300 kPa pressure leaves the boiler as saturated steam at 300 kPa (3bar) pressure. Since the performance of the heat pump (γ = COP_IP) is equal to 0.5 times the performance of the Carnot heat pump operating under the same temperature conditions, find the mass flow rate (kg / s) of the water flowing from the boiler. Note: The boiler works according to the open system SASA model. Changes in kinetic and potential energies for the boiler are negligible.

The heat pump with a power input of 2000 kW draws heat from a heat source at 70 ° C and gives heat to a boiler. Thanks to the heat given to the boiler, the saturated liquid water entering the boiler at 300 kPa pressure leaves the boiler as saturated steam at 300 kPa (3bar) pressure. Since the performance of the heat pump (γ = COP_IP) is equal to 0.5 times the performance of the Carnot heat pump operating under the same temperature conditions, find the mass flow rate (kg / s) of the water flowing from the boiler. Note: The boiler works according to the open system SASA model. Changes in kinetic and potential energies for the boiler are negligible.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 1RQ: Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop...

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The heat pump with a power input of 2000 kw draws heat from a heat source at 70° C and gives heat to a boiler. Thanks to the heat given to the boiler, the saturated liquid water entering the boiler at 300 kPa pressure leaves the boiler as saturated steam at 300 kPa (3bar) pressure. Since the performance of the heat pump (y = COPe) is equal to 0.5 times the performance of the Carnot heat pump operating under the same temperature conditions, find the mass flow rate (kg / s) of the water flowing from the boiler. Note: The boiler works according to the open system SASA model. Changes in kinetic and potential energies for the boiler are negligible.
The heat pump with a power input of 2000 kw draws heat from a heat source at 70° C and gives heat to a boiler. Thanks to the heat given to the boiler, the saturated liquid water entering the boiler at 300 kPa pressure leaves the boiler as saturated steam at 300 kPa (3bar) pressure. Since the performance of the heat pump (y = COPP) is equal to 0.5 times the performance of the Carnot heat pump operating under the same temperature conditions, find the mass flow rate (kg / s) of the water flowing from the boiler. Note: The boiler works according to the open system SASA model. Changes in kinetic and potential energies for the boiler are negligible.
In a power plant steam, steam is continuously extracted from the turbine and in a heat exchanger there is a condensation of the extracted steam. The energy released during condensation of steam is used to operate a heat engine. A heat engine receives thermal energy at a rate of 1200 kJ/min from condensing steam and rejects waste heat to a lake at 25°C at a rate of 850 kJ/min. Determine the lowest possible condensing steam temperature.
Ces An air-conditioning system operating on the reversed Carnot cycle is required to transfer heat from a house at a rate of 760 kJ/min to maintain its temperature at 24°C. If the outdoor air temperature is 35°C, determine the power required to operate this air-conditioning system. The power required to operate this air-conditioner system is kW.
The schematic below shows a heat pump that operates using R-134a as the working fluid, which flows through the system at 450 kg per hour. As shown, the heat pump operates at 27% of the maximum efficiency for a heat pump operating between the thermal reservoir temperatures in the schematic. The heat pump runs for a total of 2000 hours annually, and the price of electricity is $0.14 per kWh. Determine the power input to the compressor, in kW. Saturated Liquid Expansion Valve 4 TH = 26°C Он www Condenser Compressor Evaporator លលលលល Q₁. TL = 0°C 2 P₂ = P3 = 60°C T₂ = 800 kPa Wcomp 1 P₁ = P₁= 240 kPa
Dr. Eismann placed a refrigerator in his office. Since then he didn't touch the refrigerator. The refrigerator consumes electricity of 100 kJ per day. The refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.9 MPa. Determine the amount of energy this refrigerator supplies to Dr. Eismann's office per day after the second day.
An ammonia compressor operates on an evaporator pressure of 291.57 kPa and a condenser pressure of 1557 kPa. A Heat Exchanger is installed thus superheating the refrigerant by 100C and a subcooling by 50 C. The system is used to cool water at 2 kg/s from 250 C to 150 C. Given: h1=1476 kJ/kg , h2=1752 kJ/kg . Determine the ff: a.) mass flow of reffrigerant. kg/s b.) compressor work. kw c.) mass flow of cooling water needed in the condenser for a temp. drop of 180F. kg/s
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Refrigerant-134a enters the condenser of a residential heat pump at 1400 kPa and 65°C at a rate of 0.062 kgis and leaves at 1400 kPa as saturated liquid. If the compressor consumes 1.6 KW of power, determine (a) the COP of the heat pump and (b) the rate of heat absorption from outside air COP 3.651V& QL 4 465 kW COP 6.356 & QL 8.570 kW COP = 5432 & QL 9.653 kW COP 1.346& QL= 2.784 kW
An air conditioner with refrigerant-134a as the refrigerant is used to keep a large space at 20°C by rejecting the waste heat to the outside air at 37 °C. The room is gaining heat through the walls and the windows at a rate of 125 kJ/min while the heat generated by the computer, TV, and lights amounts to 0.7 kW. Unknown amount of heat is also generated by the people in the room. The condenser and evaporator pressures are 1200 and 500 kPa, respectively. The refrigerant is saturated liguid at the condenser exit and saturated vapor at the compressor inlet. If the refrigerant enters the compressor at a rate of 65 L/min and the isentropic efficiency of the compressor is 70%, determine (a) the temperature of the refrigerant at the compressor exit, (b) the rate of heat generated by the people in the room, (c) the COP of the air conditioner, and (d) the minimum volume flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions.
When a man returns to his well-sealed house on a summer day, he finds that the house is at 35°C. He turns on the air conditioner, which cools the entire house to 20°C in 36 min. If the COP of the air-conditioning system is 2.8, determine the power drawn by the air conditioner. Assume the entire mass within the house is equivalent to 800 kg of air for which cy= 0.72 kJ/kg °C and cp = 1.0 kJ/kg-°C. 35°C 20°C W A/C The power drawn by the air conditioner is kW.
Since 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. *Round off all answers to four decimal places*