Question
In: Mechanical Engineering
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 flow rate of refrigerant, in lb/min |
| (b) the compressor power input, in horsepower |
| (c) the isentropic compressor efficiency |
| (d) the coefficient of performance |
Round answers to 3 significant digits.
Solutions
samet mamat answered 3 years agoRelated Solutions
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?
A vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated...
A vapor-compression refrigeration cycle operates at steady state
with Refrigerant 134a as the working fluid. Saturated vapor enters
the compressor at 2 bar, and saturated liquid exits the condenser
at 10 bar. The isentropic compressor efficiency is 80%. The mass
flow rate of refrigerant is 7 kg/min.
Determine:
(a) the compressor power, in kW.
(b) the refrigeration capacity, in tons.
(c) the coefficient of performance.
An air conditioner using refrigerant-134a as the working fluid and operating on the ideal vapor-compression refrigeration...
An air conditioner using refrigerant-134a as the working fluid
and operating on the ideal vapor-compression refrigeration cycle is
to maintain a space at 30°C while operating its condenser at 1000
kPa. Determine the COP of the system when a temperature difference
of 2°C is allowed for the transfer of heat in the evaporator. (Take
the required values from saturated refrigerant-134a tables.)
The COP of the system is ?
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...
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...
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