MCE4403: Refrigeration and Air Conditioning System Lab Report - Refrigeration Cycle Analysis-2 - Engineering Assignment Help

Assignment Task:

Introduction:

At the evaporator: Conservation of mass and energy applied to this control volume together give the rate of heat transfer perm mass of refrigerant flow in the evaporator as:
q_in=h₁-h₄               eq.1

The heat transfer rate to the refrigerant in the evaporator, Qin, is referred to as the refrigeration capacity, it usually being express in kW or in tons of refrigeration.

At the compressor. It is usually adequate to assume that there is no heat transfer to or from the compressor. Conservation of mass and energy rate applied to a control volume enclosing the compressor then give: 
w_in=h₂−h₁             eq.2
Where w is the specific work done on the system (refrigerant).
At the condenser, for a control volume enclosing the refrigerant side of the condenser, the rate of heat transfer from the refrigerant perm mass of refrigerant is

q_out=h₂−h₃            eq.3

Finally, the refrigerant at state 3 enters the throttling valve and expands to the evaporator pressure. This process is usually modelled as a throttling process in which there is no heat transfer, i.e., for which 
h₄=h₃                 eq.4

In this valve, the refrigerant pressure decreases in an irreversible adiabatic process and there is an accompanying increase in entropy. The refrigerant leaves the valve at state 4 as a two-phase liquid-vapour mixture.

In the vapour-compression system, the net power input is equal to the compressor power, the expansion valve involving no power

Input or output using the quantities and expressions introduced above, the coefficient of performance, of the vapour-compression refrigerant system is given by
COP_R=q_in/w_in = h₁−h_4/h₂−h₁

Apparatus
The experiment was going to be on a system in M02 as shown in the (figure 1and 2). This unit has four main components and they are compressor, condenser, valve and evaporator. It is operated at low pressure. It has gauges to measure the pressures and temperature in different positions such as the inlet and outlet temperature and pressure of the compressor, condenser, valve and the evaporator.

Procedure:
1- Start the system.
2- Let it run until it reaches steady-state conditions (no change in pressure or temperature with time).
3- Take the following readings:
a) The refrigerant temperature at the suction Ts [oC]
b) The refrigerant temperature at the discharge Td [oC]
c) The gauge pressure at the suction Ps(bar)
d) The gauge pressure at the discharge Pd [bar]
4- Assume superheating of 10oC
5- Assume a subcooling of 10oC

Calculations:
1. Convert the measured pressure from bar to kPa and make it as an absolute pressure.

2. Draw the P-h diagram for the refrigeration cycle using the given data (Assume an ideal cycle).

Using the P-h diagram, answer the questions below.
3. Use the recorded results and determine the refrigerant phases at the suction and discharge.

4. What are the 4 processes of an ideal vapour compression cycle?

5. What is the quality ( x ) of the refrigerant after the thermal expansion valve.

6. Determine the COP of this system
a. As refrigerator
b. As a heat pump

7. Neatly, conclude and discuss your results (4-5 sentences).

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