In: Mechanical Engineering

4: Consider a vapor refrigeration cycle.

a: Draw the T-s diagram of the reversed Carnot Cycle and describe
what kind of problem each process of the cycle has explicitly. (We
use the mixture of liquid and vapor as its working fluid.)

b: Draw a T-s diagram in the ideal refrigeration cycle and label
each process explicitly. Write down the COP in terms of
enthalpy.

c: There are the multipurpose refrigeration system and the
multistage refrigeration system to improve the ideal refrigeration
system. Describe their cycles in terms of the property diagrams
explicitly and discuss the reasons why they are necessary.

d: Discuss the current status of existing refrigerants and describe
how to resolve their problems explicitly.

b) ideal VCRS cycle:

c) Regeneration

d)

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The figure below provides the T–s diagram of a Carnot
heat pump cycle for which the substance is ammonia, where
x3 = 70%.
Determine the net work input required, in kJ, for 50 cycles of
operation and 0.1 kg of substance.
Note that work is positive going into the heat pump.

Explain the Carnot engine cycle and plot its process on a) T-S
diagram b) p-v diagram

15. A reversed Carnot engine (refrigeration unit) is used to
maintain the temperature inside a freezer at -34 oC. The
room temperature in which the refrigeration unit operates is a
constant 24 oC. If the motor on the refrigeration unit
uses 0.3 kW, determine the rate at which heat is removed from the
freezer in Watts.
State your answer in whole numbers. Example: 2147
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There is a vapor compression type refrigeration cycle using the
refrigerant HFC 134 a. In the condenser, it is isostatically
cooled, the condensation temperature is 50 ° C., and the condenser
outlet is the compressed liquid at 45 ° C. In the evaporator, it is
isothermally heated, the evaporation temperature is 10 ° C. and the
outlet of the evaporator is heated steam at 15 ° C. When the
expansion valve performs isenthalpic expansion, and the adiabatic
efficiency of the...

A normal refrigeration cycle uses one coolant, so why does vapor
compression cycle of an ice rink you a primary coolant and a
secondary coolant?

Air within a piston cylinder assembly executes a Carnot
refrigeration cycle between hot and cold reservoirs at TH=500 K and
TC=300 K, respectively. The magnitude of the heat transfer rejected
to the high temperature reservoir is 250 kJ per kg of air. The
pressure at the start of the isothermal expansion is 325 kPa. The
air can be modeled as an ideal gas with constant specific
heat.
For the air as a system, determine
a. (5) the coefficient of performance....

A mole of an ideal gas goes through a cycle of a Carnot engine.
Draw the pressure vs volume and entropy vs temperature planes for
this cycle. What do the diagrams look like when the efficiency of
the cycle is 50% and 99%. Then Calculate the work done per cycle by
the gas and find the efficiency of the cycle.

A vapor-compression refrigeration cycle working with R22 contains a liquid-to-suction heat exchanger. The saturated liquid refrigerant at 40 ℃ leaving the condenser and enteringthe heat exchanger is used to superheat the saturated vapor refrigerant leaving the evaporator at 7 ℃ by 8 ℃. If the compressor is capable of pumping 5 1/s of vapor refrigerant measuredat the inlet to the compressor and the compression processes are considered isentropic in both cases listed below, determine;
(a) The refrigerating capacity in kW,...

An ideal vapor compression refrigeration cycle using r134a as
the refrigerant is being used to cool a house. It provides 3
refrigeration tons ≈ 10.5kW of cooling (heat removal from the house
air). The refrigerant in the evaporator operates at 400kPa while in
the condenser it is at 1000kPa. Treat the surroundings as a thermal
reservoir at 33◦C and the air in the house as a thermal reservoir
at 19◦C. All reservoirs are at 100kPa.
1. What is the COPr...

An ideal vapor compression refrigeration cycle with R134a as the
working fluid operates between the pressure limits of 200 kPa and
1200 kPa. Determine
a) the mass fraction of the refrigerant that is in the liquid phase
at the inlet of the evaporator, and
b) the amount of heat transfer (in kJ/kg) to the refrigerant in
the evaporator (??).

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