Question

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 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.

Answer #1

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.

a heat pump operates on the ideal vapor compression
refrigerant cycle and uses redrigerant-134a as thebworking fluid.
the condensor operates at 1200kpa and the evaportor at 280kpa.
calculate 1) the cop of the heat pump 2) the rate of heat supplied
to the evaporator when compressor consumes 20kw

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...

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.)

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.

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

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.

Consider a 280 kJ/min refrigeration system that operates on an
ideal vapor-compression refrigeration cycle with refrigerant-134a
as the working fluid. The refrigerant enters the compressor as
saturated vapor at 140 kPa and is compressed to 800 kPa. The
saturated refrigerant-134a—pressure table (in SI units) is given
below. Determine the quality of the refrigerant at the end of the
throttling process.

A
geothermal heat pump is used in winter for space heating by getting
heat from the ground at 15 °C. The working fluid in the heat pump
is R134a. The compressor inlet is at 400 kPa and the compressor
exit is at 2 MPa and 60 C. The mass flow rate of the refrigerant is
0.1 kg / s and the temperature difference in the air flow in the
condenser section is 12 C. The refrigerant is subcooled to 15...

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