Question

- a vapour-compression air-conditioning cycle where the compressor has an isentropic efficiency of 75%. Refrigerant (R12) is used as the working fluid with a mass now rate of 0.04kg/s. saturated vapour eaters the compressor at 0.5 MPa and leaves to the condenser at 1.2IMPa. The air-conditioner cools down the station to 26°C through an evaporator, and rejects heat to the 34°C ambient through a condenser. (a) Sketch and label the schematic of the air-conditioning cycle and its T-S and P-h diagrams based on the information provided in the above. (b) Determine the net of heat removal from the air-conditioned station. The compressor power in kW. The Coefficient of Performance (COP).

- (R12) is the working fluid in a vapor-compression refrigeration cycle. The evaporator temperature is - 12°C. Saturated vapor enters the turbine. Saturated liquid exits the condenser at 34°C. The mass flow rate of the refrigerant is 5 kg/min. Determine: (a) rate of heat transfer to the refrigerant passing through the evaporator, in kW (b) net power input to the cycle, in kW ' (c) the coefficient of performance

Answer #1

An idea vapor-compression refrigeration cycle, with refrigerant
R-22 as the working fluid, has an evaporator temperature of -12 °C
and a condenser pressure of 15 bar. Saturated vapor enters the
compressor, and saturated liquid exits the condenser. The
refrigerating capacity is 4 tons.
a.Determine the compressor power (in kW).
b.Determine the mass flow rate of the refrigerant (in
kg/min).
c.Determine the coefficient of performance.

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 240 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...

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 8 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, (1 ton =
3.5168 kW) and, (c) the coefficient of performance, (d) rate of
entropy production in kW/K, for the...

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 2.6 bar, and saturated liquid exits the condenser,
which operates at 8 bar. Determine for an isentropic compressor
efficiency of 85%: (a) the refrigerant mass flow rate, in kg/s. (b)
the magnitude of the compressor power, in kW. (c) the coefficient
of performance.

An ideal vapor-compression refrigeration cycle operates at
steady state with Refrigerant 134a as the working fluid. Saturated
vapor enters the compressor at 1 bar, and saturated liquid exits
the condenser at 4 bar. The mass flow rate of refrigerant is 8.5
kg/min.
Determine the compressor power, in kW.

Refrigerant 134a is the working fluid in an ideal
vapor-compression refrigeration cycle operating at steady state.
Refrigerant enters the compressor at 1 bar, -12°C, and the
condenser pressure is 9 bar. Liquid exits the condenser at 32°C.
The mass flow rate of refrigerant is 7 kg/min. Determine:
(a) the magnitude of 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 cycle is
to maintain a space at 36°C while operating its condenser at 1600
kPa. Determine the COP of the system when a temperature difference
of 4°C is allowed for the transfer of heat in the evaporator. (Take
the required values from saturated refrigerant-134a tables.)

Regarding a Vapor-Compression cycle: A refrigerant (HCFC-22)
enters the compressor of a refrigerator as a superheated vapor at
.14MPa and -20 degrees Celsius at a rate of .05 kg/s and leaves at
.8 MPa and 50 degrees Celsius. The refrigerant is cooled in the
condenser to 26 degrees Celsius and .72MPa and is then throttled
down to .15 MPa. Determine the rate of heat removal from the
refrigerated space and the power input to the compressor and the
Coefficient of...

An ice-making machine operates on the ideal vapor-compression
cycle, using refrigerant-134a. The refrigerant enters the
compressor as saturated vapor at 20 psia and leaves the condenser
as saturated liquid at 80 psia. Water enters the ice machine at
55°F and leaves as ice at 25°F. For an ice production rate of 15
lbm/h, determine the power input to the ice machine (169 Btu of
heat needs to be removed. Compressor's efficiency is 90 percent

An ice-making machine operates on the ideal vapor-compression
cycle, using R-134a. The refrigerant enters the compressor as
saturated vapor at 140 kPa and leaves the condenser as saturated
liquid at 600 kPa. Water enters the ice machine at 13oC and leaves
as ice at -4oC, while removing heat at 393 kJ per kg of water.
Estimate the mass flow rate of the refrigerant and the power input
to the ice machine for an ice production rate of 7 kg/h.

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