Related to how to choose the VRF system for real life

1. MINISTRY OF EDUCATION OF YOUTHS
AND SPORTS
INSTITUTE OF TECHNOLOGY OF CAMBODIA
DEPARTMENT OF INDUSTRIALAND MECHANICAL
FINAL YEAR THESIS
Tittle: Designing, Installation and Testing of VRF System
Students : TITH Sopheara and VENG Socheat
Specialty : Mechanical engineering
Advisor : Mr. KHOUN Rithymean
Academic Year : 2016- 2017
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2. Contents
I. General Introduction
II. Definition
III. Panasonic VRF system
IV. Load calculation
V. Selection
VI. VRF system installation
VII. Testing and Commissioning
VIII.Conclusion
2

3. I. General Introduction
 Presentation of Internship
•From: 20 February to 20 May 2017
•Company: Comin Khmere
•Position : MVAC trainee
•Project: TK Royal One (Cambodia)
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4. II. Definition
4
What is VRF systems?
• Variable refrigerant flow vary the flow of refrigerant to
indoor units based on demand. There are 2 types of VRF
system, heat pump and heat recovery system.

5. What is VRF Heat pump ?
• VRF heat pump provide heating or cooling but not
simultaneous heating and cooling
5
II. Definition

6. What is VRF heat recovery?
• VRF heat recovery can operate simultaneous in
heating or cooling mode.
6
II. Definition

7. Variable refrigerant flow (VRF) is an air-conditioning system
configuration where there is one outdoor unit and multiple
indoor units.
III. Panasonic VRF System
7

8. III. Panasonic VRF System
1. Outdoor unit
The outdoor unit of VRF
system, sometimes called the
outside unit or condenser.
8
(Carin, 2016)

9. III. Panasonic VRF System
DC twin rotary compressor:
The component of compressor are:
1. Electric motor
2. Compression mechanism
3. Accumulator
The compressor is the heart of the
refrigeration cycle.
9
(Bhatia, 2014)

10. III.Panasonic VRF System
a. 2-WAY Mini-FSV LE1 Series
 Use for cooling or heating mode only
Capacity range from 4HP to 6HP
COP: 4.21 in case of 4 HP
 Cooling operation possible up to 46 °C
And low as -20 °C for heating mode
 Max connectable 9 units with length 150m
10
(Hiong, 2016-2017)

11. III.Panasonic VRF System
b. 2-WAY FSV-EX ME2 Series
 Use for cooling or heating mode only
 Capacity range from 8HP to 80HP
 Operation temperature as high as 52°C
for cooling and as low as -20 °C for
heating mode
 Max connectable 64 units with max
length 1,000m
11
(Hiong, 2016-2017)

12. III.Panasonic VRF System
c. 3-WAY FSV MF2 Series
 Using for simultaneous heating and cooling
 Capacity range from 8HP to 42HP
 Temperature operation as high as 46°C for
cooling and as low as -20 for heating
 Max connectable 52 units with pipe length
up to 500m
12
(Hiong, 2016-2017)

13. III.Panasonic VRF System
2. Indoor unit
There are many types of indoor units such as:
• F2 type : Cooling Capacity 2.2kW to 16kW
• M1 type : Cooling Capacity 2.2kW up to 5.6kW
• Z1 type : Cooling Capacity 2.2kW to 7.3kW
• E2 type : Cooling Capacity 18kW to 28kW
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14. III.Panasonic VRF System
2. Indoor unit
• E1 type : Cooling Capacity 7.3kW to 28kW
• U1 type : 4-way cassette, Cooling Capacity 2.2kW to 16kW
• Y2 type : 4-way mini cassette, Cooling Capacity 2.2kW to 5.6kW
• L1 type : 2-way cassette, Cooling Capacity 2.2kW to 7.3kW
• D1 type : 1-way cassette, Cooling Capacity 2.8kW to 7.3kW
• P1 type : Floor standing, Cooling Capacity 2.2kW to 7.3kW
14

15. IV.Load Calculation
 Feature of the Building TK Royal One
15http://www.cambodiancondos.com/condo-developments/tk-royal-one/

16. IV. Load Calculation
1. Estimate Method
Q = S . R
• Q: Total heat load [Btu.h-1]or [W]
• S: room area [m2]
• R: The rate of cooling [Btu.h-1.m-2]
Calculation total heating load for TKR1 “ Reception
room’’ which has S = 62.4 m2
• R = 900 Btu.h-1.m-2
Thus, Q = 56160 Btu.h−1 =16.45kW
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17. Another room calculate by Estimate method
Items Type of Room
AREA Ratio Cooling Capacity
m² Btu/h.m2 kW Btu/h
1 Conference Hall 265.45 1200 93.36 318540
2 Break Room 49.07 750 10.78 36802
3 Coffee Shop 73.6 1300 28.04 95680
4 Financial Office 98.14 850 24.48 83419
5 Hall 35.5 700 7.28 24850
6 Office 56.5 850 14.07 48025
7 Meeting Room 31.95 900 8.40 28755
8 Service Counter 36.8 1300 14.02 47840
9 Shop 87.7 800 20.56 70160
10 Toilet 38 500 5.56 19000
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18. IV. Load Calculation
2. Manual Method
The Manual Method is the method used to calculate the cooling load
of the building space with minimum errors.
Total heating load:
QT = QS + QL [W]
oTotal sensitive loads
QS = QStr+ QSRm+QSRv+QSoc+QSecl+QSequip
oTotal latent loads
QL= QLr+ QLoc+QLequip
18

19. IV.Load Calculation
Calculation heating load for TKR1 “ Reception Area’’
oTotal sensitive loads
QS = 14445.26 W
oTotal latent loads
QL = 1197.58W
Total heating load:
QT= 14445.26 W + 1197.58W = 15642.84 W = 15.64 kW
19

20. IV.Load Calculation
Verify the cooling capacity coefficient R [Btu/h.m2]:
• Manul method: R= 53367Btu.h−1 / 62.4 m2 = 855 Btu.h−1
• Estimate method: R = 900 Btu.h−1
From the calculation above by manual method, we see that
error of cooling rate approximate 5 % compared to
estimation method
20

21. V. Selection
1. Selection indoor unit
The total cooling load required is 109.8 kW
21(Hiong, 2016-2017)

22. V. Selection
The characteristic of outdoor unit model U-40ME2R8
are:
• Cooling capacity 113 kW
• Using with power supply 400/415 V/3-phase/50 Hz
• Electrical rating for cooling option: 57.3 A
• Refrigerant amount at shipment: 22.0 kg
• Air flowrate: 48600 m3 h-1
22

23. V. Selection
2. Selection indoor unit
 For Conference Hall of TKR1:
The requirement of cooling load is 93.36 kW.
Catalogue of model mid static duct E1 type chosen that
Its cooling capacity from 7.3 kW to 28 kW.
E1 type is a kind of saving energy, the power input
45% less (compared to H1 type)
4 of S-224ME1E5 were chosen: Cooling capacity 4 ×
22.4kW = 89.6kW
23

24. V. Selection
24
(Hiong, 2016-2017)

25. VI.VRF System Installation
1. Air duct installation
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2. Indoor unit installation

26. VI.VRF System Installation
3. Copper pipe installation
26

27. VI.VRF System Installation
4. Drainage water pipe installation
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28. VI.VRF System Installation
5. Outdoor unit installation
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29. VII. Testing and Commissioning
Before we start operation VRF, we have to:
1. Test refrigerant pipe
2. Adding refrigerant
3. Check at main power on
4. Testing and commissioning
29

30. 30
1. Test refrigerant pipe
a. Check for any leakage in the
refrigerant piping
b. Perform vacuum drying to
remove all moisture

31. • Keeping the valve of the outdoor
unit closed
• If the specified amount of
refrigerant cannot be charged, fully
open the valves of the outdoor unit
at liquid and gas sides, operate the
air conditioner in COOL mode
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2. Adding refrigerant

32. Check on the outdoor unit
Check on the setting indoor unit
32
3. Check at main power on
a. Check ON the rotary switches of
outdoor unit
b. Check ON the setting indoor unit

33. • Incoming supply for outdoor phrase sequence for 3 phases,
Incoming Voltage (380~415V).
• Incoming voltage for Indoor 220~240V and ensure power supply all
Indoor unit is turn "ON".
• Once all the setting is set and check, then start addressing the system
by short-circuit pin CN-30
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4. Testing and commissioning

34. 34
 Start addressing the system by short-circuit pin CN-30
Laptop - Window 7 professional – 32
or 64 bits operation system
 Normal USB Printer
Wire
 Panasonic Flash Writer – 8F000900210 / Part Code – 6233214375
 To be purchase from Panasonic
(Oudom, 2017)

35. 35
a. Indoor fan speed and temperature.
OUTDOOR Screen
INDOOR Screen
b. Outdoor Compressor temperature,
Gas temperature and etc.
 After the result have to be printed out by manufacture and to be attached in
Testing and Commissioning form for VRF recording.
(Oudom, 2017)

36. VIII. Conclusion
• The calculation cooling load by estimation and manual
seem a litter bit difference value. The selection of the
systems that suitable for reception area and conference
hall is outdoor unit model U-40ME2R8 which maximum
cooling capacity is 113 kW.
• To get the best result of VRF system, we have to
understand about plan and condition for installation of
indoor unit, outdoor unit, air duct, copper pipe, and
drainage water pipe.
• VRF testing and commissioning is a part which we use
the method statement to carry on indoor unit, outdoor unit
operation after installation.
36

37. Thank You For Your
Attention !
Q & A
37
Thank you for your
attention!!!
Question?