Question
In: Mechanical Engineering
A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power...
A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power cycle with a thermal efficiency of 30%. For the heat pump, Refrigerant 134a is compressed from saturated vapor at -10°C to the condenser pressure of 10 bar. The isentropic compressor efficiency is 80%. Liquid enters the expansion valve at 9.6 bar, 34°C. For the power cycle, 80% of the heat rejected is transferred to the heated space.
(a) Determine the power input to the heat pump compressor, in kW (b) Evaluate the ratio of the total rate that heat is delivered to the heated space to the rate of heat input to the power cycle. Round answers to 3 significant digits.
Solutions
samet mamat answered 2 years agoRelated Solutions
A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power...
A vapor-compression heat pump with a heating capacity of 500
kJ/min is driven by a power cycle with a thermal efficiency of 20%.
For the heat pump, Refrigerant 134a is compressed from saturated
vapor at -10°C to the condenser pressure of 10 bar. The isentropic
compressor efficiency is 80%. Liquid enters the expansion valve at
9.6 bar, 34°C. For the power cycle, 80% of the heat rejected is
transferred to the heated space. (a) Determine the power input to
the...
A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power...
A vapor-compression heat pump with a heating capacity of 500
kJ/min is driven by a power cycle with a thermal efficiency of 20%.
For the heat pump, Refrigerant 134a is compressed from saturated
vapor at -10°C to the condenser pressure of 10 bar. The isentropic
compressor efficiency is 80%. Liquid enters the expansion valve at
9.6 bar, 34°C. For the power cycle, 80% of the heat rejected is
transferred to the heated space.
(a) Determine the power input to the...
A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power...
A vapor-compression heat pump with a heating capacity of 500
kJ/min is driven by a power cycle with a thermal efficiency of 20%.
For the heat pump, Refrigerant 134a is compressed from saturated
vapor at -10°C to the condenser pressure of 10 bar. The isentropic
compressor efficiency is 80%. Liquid enters the expansion valve at
9.6 bar, 34°C. For the power cycle, 80% of the heat rejected is
transferred to the heated space. (a) Determine the power input to
the...
A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power...
A vapor-compression heat pump with a heating capacity of 500
kJ/min is driven by a power cycle with a thermal efficiency of 20%.
For the heat pump, Refrigerant 134a is compressed from saturated
vapor at -10°C to the condenser pressure of 10 bar. The isentropic
compressor efficiency is 80%. Liquid enters the expansion valve at
9.6 bar, 34°C. For the power cycle, 80% of the heat rejected is
transferred to the heated space. (a) Determine the power input to
the...
A vapor-compression heat pump with a heating capacity of 500 kJ/min is driven by a power...
A vapor-compression heat pump with a heating capacity of 500
kJ/min is driven by a power cycle with a thermal efficiency of 30%.
For the heat pump, Refrigerant 134a is compressed from saturated
vapor at -10°C to the condenser pressure of 10 bar. The isentropic
compressor efficiency is 80%. Liquid enters the expansion valve at
9.6 bar, 34°C. For the power cycle, 80% of the heat rejected is
transferred to the heated space. (a) Determine the power input to
the...
Refrigerant 134a is the working fluid in a vapor-compression heat pump system with a heating capacity...
Refrigerant 134a is the working fluid in a vapor-compression
heat pump system with a heating capacity of 60,000 Btu/h. The
condenser operates at 180 lbf/in.2, and the evaporator
temperature is 0°F. The refrigerant is a saturated vapor at the
evaporator exit and a liquid at 110°F at the condenser exit.
Pressure drops in the flows through the evaporator and condenser
are negligible. The compression process is adiabatic, and the
temperature at the compressor exit is 180°F. Determine
(a) the mass...
Refrigerant 134a is the working fluid in a vapor-compression heat pump that provides 35 kW to...
Refrigerant 134a is the working fluid in a vapor-compression
heat pump that provides 35 kW to heat a dwelling on a day when the
outside temperature is below freezing. Saturated vapor enters the
compressor at 2.1 bar, and saturated liquid exits the condenser,
which operates at 8 bar.
Determine for an isentropic compressor efficiency of 75%:
(a) the refrigerant mass flow rate, in kg/s.
(b) the magnitude of the compressor power, in kW.
(c) the coefficient of performance.
For an ideal vapor-compression heat pump cycle, refrigerant 134a is used to provide 35 kW of...
For an ideal vapor-compression heat pump cycle, refrigerant 134a
is used to provide 35 kW of heat to a building. Saturated vapor
enters the compressor at 1.6 bar and saturated liquid exits the
condenser which operates at 8 bar. What is (a) the mass flow rate
of the refrigerant, and (b) the COP?
The figure below gives data for an ideal vapor-compression heat pump cycle operating at steady state...
The figure below gives data for an ideal vapor-compression heat
pump cycle operating at steady state with Refrigerant 134a as the
working fluid. The heat pump provides heating at a rate of 15 kW to
maintain the interior of a building at TH =
20°C when the outside temperature is TC =
0°C.
State
p
(bar)
h
(kJ/kg)
1
2.4
244.1
2
10
273.6
3
10
105.3
4
2.4
105.3
Determine:
(a) the temperatures at the principal states of the...
Given that the heat of fusion of water is -6.02 kJ/mol, that the heat capacity of...
Given that the heat of fusion of water is -6.02 kJ/mol, that the
heat capacity of H2O(l) is 75.2 J/mol⋅K and that the heat
capacity of H2O(s) is 37.7 J/mol⋅K, calculate the heat of
fusion of water at -10 ∘C. Please show work
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