1. Experiment of Thermo engineering
Group 5
Ui Hwa Jung
Min Ho Kim
Sang Jun Park
Yo Han Kim
Good evening everyone, my name is minho kim. A member of the fifth group.
Today I am going to talk about the experiment and result that we have got for last week.

2. ◆ Contents ◇ Experiment purpose. ◇ Basic theory.
Experiment of Thermo engineering
◆ Contents
◇ Experiment purpose.
◇ Basic theory.
◇ Equipment structure.
◇ Variables
◇ Experiment data analysis
◇ Q & A
This is thetable of contents
Experiment(iksperumunt)purpose, Basic theory(thiari), Equipment(ikwipment) structure, Variables,
Experiment data analysis and Question & Answer

3. ◆ Purpose of Experiment
Experiment of Thermo engineering
◆ Purpose of Experiment
◇ To understand the basic structure element of
refrigeration device
◇ To learn the function of the component through the
actual manipulation
◇ Set 4 variables and measure the Temperature,
Pressure, and Enthalpy changes
◇ To find the change of refrigerator performance
purpose of experiment is
To understand the basic structure element of refrigeration device
To learn the function of the component through the actual manipulation
Set 4 variables and measure the Temperature, pressure, and Enthalpy changes
And To find the change of refrigerator performance

4. ◆ Basic theory. Experiment of Thermo engineering
◇ Flow chart of standard refrigeration cycle
a. The compression course
b. The condensation course
c. The expansion course
d. The evaporation course
This image is a flow chart of standard refrigeration cycle.
Which start from compressor, condenser, expansion valve, through evaporator.
It is theory that you know well. Finish explanation briefly and Go to the next page.

5. ◆ Equipment structure. Experiment of Thermo engineering
◇ Refrigeration experiment machine device
This is the basic structure of equipment that we used for last 8weeks, as you can see the picture on the slide.

6. ◆ Equipment structure. Experiment of Thermo engineering
◇ Circuit diagram
My group used this circuit diagram as shown on the slide

7. ◆ Variables Experiment of Thermo engineering
◇ measured results every 15 minutes of operation
◇ Standard measurement
◇ 20 degree opened evaporator chamber
◇ Half rotation fastened expantion valve
◇ One rotaion fastened expantion valve
These are variables that we used on our experiment which are listed as shown. We used five different variables.
We measured results every 15 minutes of operation , and Standard measurement, 20 degree opened evaporator chamber, Half rotation fastened expantion valve, One rotaion fastened expantion valve.

8. ◆ Experiment data analysis
Experiment of Thermo engineering
◆ Experiment data analysis
We can compare the temperature and pressure changes of refrigeration on these two graphs.
Standard measurement from 0 to 15 minutes shows standard cycle
20 degree opened evaporator chamber from 15 to 30 minutes, didn't operate properly, so can't even compare the results.
Half rotation fastened expantion valve from 30 to 45 minutes and one rotaion fastened expantion valve from 45 to 60 minutes
On the temperature related graph, there is not much difference between them, when compared.
Also, the pressure decreases as the valve is turned counterclockwise.

9. ◆ Experiment data analysis
Experiment of Thermo engineering
◆ Experiment data analysis
We can compare the entalpy change and heat exchange of refrigeration on these two graphs.
Standard measurement from 0 to 15 minutes show standard cycle. But when you see the graph, input and output is not uniform.
20 degree opened evaporator chamber from 15 to 30 minutes it didn't work out once again
Half rotation fastened expantion valve from 30 to 45 minutes and one rotation fastened expantion valve from 45 to 60 minutes
The(디) enthalpy is uniform, not depends on the opening and shutting of expansion valve,
in other words, variation of internal pressure and volume.

10. ◆ Experiment data analysis
Experiment of Thermo engineering
◆ Experiment data analysis
We can compare the cop of refrigeration on this graphs.
Standard measurement from 0 to 15 minutes shows standard cycle
20 degree opened evaporator chamber from 15 to 30 minutes, it didn't work out once again, needs better lab. environment
Half rotation fastened expantion valve from 30 to 45 minutes and one rotaion fastened expantion valve from 45 to 60 minutes
sudden increases of COP during the process seems like/// large amount of the refrigerant flew at once.

11. ◆ Q & A Thank you Experiment of Thermo engineering
thank you for listening to all of you
do you have any question??
Then.. I think that's all I have for todays presentation
thank you very much...