1. Automatic Temperature Control System
Group 5
Lee Sang-hyun
Kim Yoon-tae
Gang Sang-hyuk
Jang Jung-yul

2. Circuit N.F.B L1(+)L2(-) COMP CFM MC-a PL Ry YL GL MC SV PB2 PB1 Ry-a
Ry-b C H L TC
EFM
N.F.B
L1(+)L2(-)
COMP
CFM
MC-a PL Ry YL GL MC SV
PB2
PB1
Ry-a
Ry-b C H L TC
EFM

3. Test Steps Test steps T-Setting T-Deviation CFM Chamber EFM Chamber
Evaporating Pressure
Evaporating Load 1 4
Entirely open
High 2
Low 3
Half open 5 6 7 8 9

4. Process of Cut-in and Cut-out
Temp.
Cut-in
Set Value
Cut-out t
DIFF
(TC off)
(TC on)
Time

5. p-h Curve 5-6 Expansion valve 2-5 Condenser 6-1 Evaporator 1-2
Compressor
Enthalpy – up
Pressure – const.
Enthalpy – down
Pressure – const.
Enthalpy – up
Pressure - up
Enthalpy – down
Pressure – const.

6. Trial & Error

7. Step 1 - Temperature Test steps T-Setting T-Deviation CFM Chamber
EFM Chamber
Evaporating Pressure
Evaporating Load 1 4
Entirely open
High

8. Step 2 - Temperature Low evaporating load Test steps T-Setting
T-Deviation
CFM Chamber
EFM Chamber
Evaporating Pressure
Evaporating Load 2 4
Entirely open
High
Low
Low evaporating load

9. Comparison between step 1 and 2
Temperature
Red Line - Rise slowly but down quickly

10. Comparison between step 1 and 2
Temperature
Red line – down slowly but rise quickly

11. Comparison between step 1 and 2
Temperature
Condenser In

12. Comparison between step 1 and 2
Temperature
Comparison between step 1 and 2
Condenser out
Expansion Valve in

13. Comparison between step 1 and 2
Temperature
Comparison between step 1 and 2
Expansion Valve out
Evaporator

14. Comparison between step 1 and 2
Temperature
Comparison between step 1 and 2
Evaporating room
Condensing Room

15. Comparison between step 1 and 2
Pressure

16. Comparison between step 1 and 2
Pressure

17. Step 3 to 9 - Temperature

18. Step 3 to 9 - Pressure

19. Analysis
This system can be used in every part where is related to temperature control.
The results were affected much more by Evaporating load and pressure than other conditions.
It’s important that finding out the appropriate evaporating pressure. In accordance with the amount of refrigerant, the results were come out more differently than other cases.
We’d have got a better data if the equipment had pointed off more frequently.
It was a good experience for us to learn about temperature control system.

20. I’d like to invite any question for you~^^
End with Q & A
GROUP 4
I’d like to invite any question for you~^^