Question

an ideal vapor compression refrigeration cycle using
refrigerant-134a as the working fluid is used to cool a brine
solution to -5degrees Celsius. This solution is pumped to various
buildings for the purpose of air-conditioning. The refrigerant
evaporates at -10 degrees Celsius with a total mass flow rate of
7kg/s and condenses at 600kPa

Determine

a) the COP of the cycle and

b) The total cooling load

Answer #1

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 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.

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.

An air-conditioning system with R134a as the working fluid
operates on an ideal vapor compression refrigeration cycle. The
working pressure of the evaporator and the condenser are 200 kPa
and 1.0 MPa, respectively. The refrigerant flow rate is 0.03
kg/s.
a) Draw the process cycle on a T-s diagram with labels.
b) Determine the power input and COP of the system.
c) Determine the tons of refrigeration.
d) What is the SEER rating of the system?
e) What is the...

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...

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

Consider the vapor-compression refrigeration cycle with HFC-134a
as refrigerant. If the evaporation temperature is -8 °C, show the
effect of condensation temperature on the coefficient of
performance by making calculations for condensation temperatures of
30 °C and 25 °C. (a) Assume isentropic compression of the vapor.
(b) Assume compressor efficiency of 85%.

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

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