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 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 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. |
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 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...
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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