Note: Draw the necessary schematic sketches and diagrams wherever required.
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Note: Draw the necessary schematic sketches and diagrams
wherever required.
2. A heat pump supplies energy...
Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a...
Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. If the compressor consumes 1.2 kW of power, determine (a) the COP of the heat pump and (b) the rate of heat absorption from the outside air.
QUESTION 1 A heat pump extracts heat from a cold temperature reservoir at 263 K at...
QUESTION 1 A heat pump extracts heat from a cold temperature reservoir at 263 K at high temperature reservoir, an auditorium, at 298 K. The heat pump requires (a) Draw a schematic diagram of the heat pump a rate of Q, and rejects 8 kW of heat to a an input power of 2.5 kw system and the reservoirs and show all energies and their values and directions on the diagram. ing an energy balance on the system, determine the...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C in winter and consumes 8 kW of power (electricity) when operating. On a day temperature outside the house is -3 °C, the house is estimated to lose heat at an average rate of 80,000 kJ/h. (Sa). (2p) Please identify the hot reservoir and the cool reservoir of this heat pump. (5b). (2p) Please draw of schematic diagram of this heat pump-house heating system with...
02. [HW] Textbook problem 6-160 (6 marks) A heat pump receives heat from a lake that...
02. [HW] Textbook problem 6-160 (6 marks) A heat pump receives heat from a lake that has an average winter time temperature of 6°C and supplies heat into a house having an average temperature of 27° C. (a) If the house loses heat to the atmosphere at a rate of 64000 kJ/h, determine the minimum power supplied to the heat pump, in kW. (b) A heat exchanger is used to transfer the energy from the lake water to the heat...
A heat pump operating with R-134a is used to maintain an indoor temperature of 21°C using...
A heat pump operating with R-134a is used to maintain an indoor temperature of 21°C using heat from the bottom of a lake that stays at 2°C. Assume an 80% efficient compressor. If the heat pump supplies 100 kW of energy to the building, calculate the required mass flow rate and COP for the heat pump. Calculate a few data points to plot the effect of a 10°C temperature range at the cold side on required mass flow rate and...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assum...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
It is found that 40 kJ.s- of heat energy is lost from a building when the...
It is found that 40 kJ.s- of heat energy is lost from a building when the internal air temperature is maintained at 22°C and the outside air temperature is 6°C. (a) What is the overall rate of entropy generation? (b) To match this heat loss a heat pump is to be employed which extracts heat from an outside, under-ground heat source. Sketch the heat-pump system diagrammatically and show the heat pump cycle on a sketch of the pressure-enthalpy diagram relating...
2. For the ideal Rankine cycle case where the feed pump and turbine are isentropic, and...
2. For the ideal Rankine cycle case where the feed pump and
turbine are isentropic, and the electric motor on the feed pump and
the electric generator are 100% efficient:
a. Determine the specific enthalpy of the refrigerant at the
entry and exit of the feed pump, and the entry and exit of the
turbine; (8 Marks – 2 marks each)
b. Sketch and label the ideal process paths of the cycle on a
T-s diagram, an h-s diagram and...
6.172 heat pump using 2 kW of power input. It keeps a chicken A farmer runs a hatchery at a constant 30°C while...
6.172 heat pump using 2 kW of power input. It keeps a chicken A farmer runs a hatchery at a constant 30°C while the room loses 10 kW to the colder outside ambient a 10°C. Find the COP of the heat pump, the rate of entropy generated in the heat pump and its heat exchangers, and the rate of entropy generated in the heat loss process? Problem 2. Sappe the sewers shows in Figre 4.10 have @*0 md Qamd Qrame...
pts per question) 1. A 2 m piston cylinder device contains nitroen gas at 200 kPa...
pts per question) 1. A 2 m piston cylinder device contains nitroen gas at 200 kPa and 350K. Now heat is transferred to the nitrogen in the tank and the pressure of nitrogen rises to 900 kPa and volume is maintained at same. The boundary work done during this process is (a) 1080 kJ (b) 840 k (c)240 k 2. A heat engine receives heat from a source at 727°C and rejiects the waste heat to a sink at 27°C,...
QUESTION 1 A heat pump extracts heat from a cold temperature reservoir at 263 K at high temperature reservoir, an auditorium, at 298 K. The heat pump requires (a) Draw a schematic diagram of the heat pump a rate of Q, and rejects 8 kW of heat to a an input power of 2.5 kw system and the reservoirs and show all energies and their values and directions on the diagram. ing an energy balance on the system, determine the...
5, (25 points) A Carnot heat pump is used to maintain a house at 20 °C in winter and consumes 8 kW of power (electricity) when operating. On a day temperature outside the house is -3 °C, the house is estimated to lose heat at an average rate of 80,000 kJ/h. (Sa). (2p) Please identify the hot reservoir and the cool reservoir of this heat pump. (5b). (2p) Please draw of schematic diagram of this heat pump-house heating system with...
02. [HW] Textbook problem 6-160 (6 marks) A heat pump receives heat from a lake that has an average winter time temperature of 6°C and supplies heat into a house having an average temperature of 27° C. (a) If the house loses heat to the atmosphere at a rate of 64000 kJ/h, determine the minimum power supplied to the heat pump, in kW. (b) A heat exchanger is used to transfer the energy from the lake water to the heat...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
It is found that 40 kJ.s- of heat energy is lost from a building when the internal air temperature is maintained at 22°C and the outside air temperature is 6°C. (a) What is the overall rate of entropy generation? (b) To match this heat loss a heat pump is to be employed which extracts heat from an outside, under-ground heat source. Sketch the heat-pump system diagrammatically and show the heat pump cycle on a sketch of the pressure-enthalpy diagram relating...
2. For the ideal Rankine cycle case where the feed pump and
turbine are isentropic, and the electric motor on the feed pump and
the electric generator are 100% efficient:
a. Determine the specific enthalpy of the refrigerant at the
entry and exit of the feed pump, and the entry and exit of the
turbine; (8 Marks – 2 marks each)
b. Sketch and label the ideal process paths of the cycle on a
T-s diagram, an h-s diagram and...
6.172 heat pump using 2 kW of power input. It keeps a chicken A farmer runs a hatchery at a constant 30°C while the room loses 10 kW to the colder outside ambient a 10°C. Find the COP of the heat pump, the rate of entropy generated in the heat pump and its heat exchangers, and the rate of entropy generated in the heat loss process? Problem 2. Sappe the sewers shows in Figre 4.10 have @*0 md Qamd Qrame...
pts per question) 1. A 2 m piston cylinder device contains nitroen gas at 200 kPa and 350K. Now heat is transferred to the nitrogen in the tank and the pressure of nitrogen rises to 900 kPa and volume is maintained at same. The boundary work done during this process is (a) 1080 kJ (b) 840 k (c)240 k 2. A heat engine receives heat from a source at 727°C and rejiects the waste heat to a sink at 27°C,...
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