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Tài liệu hướng dẫn LG AHU

LG VRF APPLICATION
for
AIR HANDLING UNIT
Dx Coils


VRF AHU Dx Coils
• Ventilation and conditions
• Basic on AHU designing and selection
– Weather conditions
– Air quality/comfort conditions

• Dx application and components
• LG VRF AHU Dx solutions
– HEX (coils) structure: single, multiply
– Refrigerant flow control: EEV, TEX

• Control solutions


VRF AHU Dx Coils

Weather statistic average temperature and Relative humidity in Montenegro
Podgorica


VRF AHU Dx Coils
Solutions: Fresh Air Supply
Fresh Air supply + heating/Cooling load
Health & Comfort
The increase of living in closed space and concentration of polluted material gives bad
effect on human health.
Gas-phase
Particle
Gas-phase polluted
polluted material
material
Particle polluted
polluted material
material

Material Main reason

Health

Material

Main reason

Health

Dust

outdoor air , clothes

allergy

Mite’s excretion,
fiber particle

carpet,pet,
food scrap ,mite

allergy

tobacco

lung cancer, etc.

Bacteria

people, outdoor air

indoor air pollution index

CO2

body, combustion

no direct harmfulness
except high concentration

CO

atmosphere pollution,
tobacco

deadly poisonous even
though low concentration

NO2

atmosphere pollution,
tobacco

lung stimulation

HCHO

veneer board
adiabatic material

eye,skin stimulation
headache,vomiting

SO2

combustion,
atmosphere pollution

eye,skin,mucous
membrane stimulation

O3

radiation,
Atmosphere pollution

eye,skin
upper airway stimulation

Mold

construction material,
outdoor air

allergy

Rn

soil,stone,
underground water

lung cancer

Pollen

outdoor air

allergy

odor

body,tobacco
heat/cooling system

discomfort

Asbestos

adiabatic material

lung cancer,skin disease
tumor,etc.




Smoke


VRF AHU Dx Coils
Air quality and Ventilation
CR 1752, EN 15251
1. Demand by person, and Function/Category

2. Air quality - ventilation

Efficiency of ventilation

Air flow demand


VRF AHU Dx Coils
Selection Complex Solution by air quality + concerning building load calculation
Heating/cooling loads involved with a building include outside attributes such as external temp, solar radiation,
wind and humidity as well as inside attributes such as human heat, heat from lighting and electronic
appliances, in addition to loads generable thru exterior walling structure and windows of the building. Such
architectural/environmental elements cause heating/cooling loads to take place.

External temp

Wind
Humidity

Solar radiation

Outdoor unit

Heat transfer

Heat from human,
lighting, device

Pipe/duct system
Indoor unit

Based on indoor
Temp/humidity

Building loads (q)

Cool(heat remove)
heat(heat added)

Heat loss

System process

Heat loss

System function

Efficiency lowered


VRF AHU Dx Coils
Designing conditions
Factors
Factors

Regulations
Regulations

Design
Design Condition
Condition
Categories

Temperature
Temperature

Humidity
Humidity

Cleanness
Cleanness

Air
Air current
current

17 ~ 28 ℃

40 ~ 70 %

Floating dust: 0.15 mg/ ㎥
CO: 10 ppm
CO2: 1000 ppm

Under 0.5 m/s

Summer

Winter

Ordinary building
(office/residence)

26 ℃, 50 %

22 ℃, 50
%

Commercial building
(bank/department)

26 ℃, 50 %

21 ℃, 50
%

Industrial building
(factory)

28 ℃, 50 %

20 ℃, 50
%

CO2 Standard
Indoor design spec.

1,000 ppm

Outdoor design spec.

350 ppm

Categories

Cooling

Heating

Air velocity
(m/s)

0.1 ~ 0.25

0.13 ~ 0.18

1.7 ℃

2℃

Gap between
up and down

ding to different countries, these regulations might be different


VRF AHU Dx Coils
To calculate/estimate capacity of HVAC system, in either individualized or centralized system, considerations
shall be taken on loads required in terms of building load, heat source system, distribution system & airconditioning system.
Cooling load subject to external
Temp/building characteristics

Building load

Capacity of outdoor unit
Considering system functions

Arrangement of indoor
unit For better cooling

Terminal Unit

Distribution
Header

Solar

• Roof
• Wall
• Glass window

Heat source
Chiller

35℃ Outside
AHU

24℃
Remove
load

FCU/convector
• Ext air entry
• Ventilate

Human light, equipment

• Lighting
• Human body
• Equipment

Remove
load

Boiler
Heat pump

IDU

Refrigerant
pipe


VRF AHU Dx Coils
Ventilation
Ventilation Type
Type 11
Exhaust Fan

Supply Fan

•Supply Fan and Exhaust Fan.
•The pressure in the room can be
controlled by two fans.

Indoor

Ventilation
Ventilation Type
Type 22
•Fresh outdoor air is mechanically supply.

Supply Fan

Indoor
Natural
Exhaust

•The room is in positive pressure. (ex.
surgery theatre,clean room)

Ventilation
Ventilation Type
Type 33
Natural
Supply

Indoor

Exhaust Fan

•The stale air in the room is
mechanically discharged.
•The room is in negative pressure. (ex.
kitchen, bathroom)


VRF AHU Dx Coils


VRF AHU Dx Coils


VRF AHU Dx Coils


VRF AHU Dx Coils
HEATING: different concept – different energy consumption
HEATING: different concept – different initial cost

%
40

Temperature [°C]

%

40

5%
10 %
15 %
20
%
25
%
30
%

Temperature [°C]

40

%

5%
10 %
15 %
20
%
25
%
30
%

Temperature [°C]

340

360

300

260

220

180

160

3
140

1.48

200

1.46

240

1.44

280

1.42

/m³]

320

ir [kg

120

1.50

4
100

1.52

2
80

1.54
60

1.56
1.58 5
1.60
1.612
1.64
1.66
1.68
0

51%

1.36
Den
1.3
% sity0 o%f mois0tu% 0 % 90 % 00 % 4
1
7 red a8
6

20

10

50

40

5

1.40

[k J/ kg]

1.74
0

1.38

Enthalpy

1.70
1.72

340

1.68

360

1.66

300

1.64

260

100%

1.62 1

220

25
30
35
40
Absolute moisture content [g/kg]

1.60

240

20

6

1.56

180

15

1.54

200

10

1.52 2

1.58

140

5

160

1.74
0

Air pressure: 1,013.3 hPa

Montenegro
Winter comfort range
[DIN EN 13779:2004]

5

1.50

100

1.70
1.72

4

0

0

1.68

1.36
Den
1.3
% sity0 o%f mois0tu% 0 % 90 % 00 % 4 44
1
7 red a8ir
6
42
[kg/m
³]
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
Montenegro
Winter comfort range
-18
Air pressure: 1,013.3 hPa
[DIN EN 13779:2004]
-20
15
20
25
30
35
40
Absolute moisture content [g/kg]

50

120

1.66

1.48

60

1.64

1.46

20

20

1.62 1

1.44

40

40

1.60

1.42

80

60

1.56

1.40
3

[k J/ kg]

3

80

1.54

1.38

Enthalpy

100

1.52

44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20

280

300

260

1.50

1.58

220

120

[k J/ kg]

140

1.48

180

160

4

200

1.46

240

1.44

280

1.4
22

/m³]

320

ir [kg

340

1.36
Den
1.3
% sity0 o%f mois0tu% 0 % 90 % 00 % 4
1
7 red a8
6
320

1.40

50

360

1.38

Enthalpy

44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20

heat recovery – no humidification – heating
Total heat transfer – Enthalpy HEX
5%
10 %
15 %
20
%
25
%
30
%

heat recovery – humidification – heating
Sensible heat transfer – Plate HEX

preheating – humidification – post heating

1.70
1.72
1.74
0

Air pressure: 1,013.3 hPa

5

10

15

20

21%

Montenegro
Winter comfort range
[DIN EN 13779:2004]

25
30
35
40
Absolute moisture content [g/kg]


VRF AHU Dx Coils
COOLING: different concept – different energy consumption
COOLING: different concept – different initial cost

40

%

5%
10 %
15 %
20
%
25
%
30
%

Temperature [°C]

40

%

5%
10 %
15 %
20
%
25
%
30
%

Temperature [°C]

40

%

5%
10 %
15 %
20
%
25
%
30
%

360

320

280

300

240

260

25
30
35
40
Absolute moisture content [g/kg]

200

51%

20

220

15

160

10

180

5

3

1.50

120

1.74
0

Air pressure: 1,013.3 hPa

2
4

1.48

140

1.72

Montenegro
Summer comfort range
[DIN EN 13779:2004]

1.46

1.52
80

1.70

1

1.54
1.56

1.60
1.62
1.64
1.66
1.68
0

1.68

[kg/m
³]

100

1.66

1
% 0 % 0 % .34
%
9
10
7is0tured a8ir0

40

1.64

60

20

1.62

1s.3
Den
ity6o%f
mo

%

5

1.44

1.58

50

60

1.60

1.42

[k J/kg]

1.56

1.40

En thalpy

1.54

44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20

1.38

340

360

320

280

300

240

260

25
30
35
40
Absolute moisture content [g/kg]

200

100%

20

220

15

160

10

1.52

1.58

180

5

5

1.50

120

1.74
0

Air pressure: 1,013.3 hPa

1.48

140

1.72

Montenegro
Behaglichkeitsfeld im Sommer
ASHRAE 1997

3

80

1.70

1.46

0

0

1.68

4

/m³]

100

1.66

1.44

ir [kg

40

1.64

2
1

5

1
% 0 % 0 % .34
9
80
10
a

20

20

1.62

1.42

heat recovery - cooling

De1
n .36
% sity0 o%f mois0tu%
0
7 red
6

60

40

1.60

1.40

[kJ/kg]

60

1.56

1.38

Enthalpy

80

1.54

44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20

340

360

320

280

200

120
100

1.52

1.58

160

[kJ/kg]

2

1.50

140

3

1.48

180

1.46

220

1.44

240

1

300

1.42

10

1.3
0% 4

340

1.40

Enthalpy

44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20

mixing - cooling
1.36
Den
% sity0 o%f mois0tu% 0 % 90 %
7 red a8ir
6
50
[kg/m
³]

260

Temperature [°C]

cooling only
1.38

1.70
1.72
1.74
0

Air pressure: 1,013.3 hPa

5

10

15

66%

20

Montenegro
Summer comfort range
[DIN EN 13779:2004]

25
30
35
40
Absolute moisture content [g/kg]


VRF AHU Dx Coils


VRF AHU Dx Coils


VRF AHU Dx Coils
LGE AE CONTROL SOLUTIONS :
Room temperature (exhaust) controlled
It means higher capacity IDU
Control:
Temperature sensor
DDC
BMS
APPLIATION RANGE: depends onVRF (-25°C)
+ DX COIL air in temperature min. +5°C!

Supply air controlled

tIN > 5°C !

Dx coill

Fresh air supply systems
Control:
AI: 0-10V
DDC/PLC
BMS
APPLICATION RANGE: depend on VRF + DX COIL air in temperature > +5 °C

Heat Recovery


VRF AHU Dx Coils
LGE AE CONTROL SOLUTIONS :


COMMUNICATION KIT

Controlled by
Remote controller or Dry contact via
DDC

Communication Kit
Support LG Centralized controllers
(PRCKA1)

Controlled by
DDC

LG Centralized controllers are not

Communication Kit
applicable
(PRDCA0)

Not applicable

Multiple AHUs + EEV kits with Indoor units

1 AHU + 1 EEV Kit without indoor units
1

REFRIGERANT CONTROLLER

TXV : Thermal Expansion Valve

EEV : Electronic Expansion Valve

EEV Kit
(PRLK048A0
PRLL096A0)

2 Models

~10HP

~20HP

Multiple EEV kits in 1 MULTI V system
(PRCKA1 only)
1

2

3



~80HP

1

TXV Kit
(Expansion Kit)
PATX13A0E
PATX20A0E
PATX25A0E
PATX30A0E
PATX35A0E

5 Models

~16HP ~26HP

~36HP ~46HP ~56HP
1 TXV kit in 1 MULTI V system
1


Multiple EEV Kits(~80HP) or Single TXV Kit(~56HP)
Option 3

Option 1

RETRUN AIR

Option 2
PRCKA1

EEV or TXV Kit

* Option 1 : LG Remote controller, Option 2 : LG Dry contact + DDC(Field supply), Option 3 : LG Centralized control

Single EEV(~20HP) or TXV Kit(~56HP)

Multiple EEV Kits(~80HP) or Single TXV Kit(~56HP)

SUPPLY AIR via DDC

Option 1

PRCKA1

PRDCA0

IO module

Option 1

1
EEV or TXV
Kit

EEV or TXV
Kit
** Option 1 : LG Remote controller(monitoring only)
*** Option 1 : LG Remote controller, Option 2 : LG Centralized control

Option 2


Simple AHU control with return(room) air control (When applying PRCKA1 model)
CONCEPT - Simple AHU control with return(room) air control (When applying PRCKA1
model)
Concept
MULTI V™ Series
!! Centralized control

LG Centralized controllers (Optional item)

CEN A-B

?? HOW DOES IT WORK
BACnet
Modbus
Lonworks

LAN

IDU A-B

LG Wired
remote controller
Room air
TB 12-13-14

Return air
Pipe in

TB 4-5

AHU

Power Supply(220-230V)

TB 1-2-3

Coil
Pipe out

* Fan output signal should be connected to relay coil.
Direct connection from AHU comm. kit to fan will cause a critical product damage.

Fan output
signal*
(220-230V)

Control
panel

Field
supply


RA PRCKA1 – How does it work? #1
1 AHU Comm. Kit senses return/room air(selectable) temperature

LG Wired
remote controller
Room air
Return air


RA PRCKA1 -

MULTI V™ Series

How does it work? #2

1 AHU Comm. Kit senses return/room air(selectable) temperature
2 If return(room) air is higher than setting temperature, outdoor unit will start operation (based on cooling operation)

IDU A-B

LG Wired
remote controller
Room air
Return air

Coil


RA PRCKA1 -

MULTI V™ Series

How does it work? #3

1 AHU Comm. Kit senses return/room air(selectable) temperature
2 If return(room) air is higher than setting temperature, outdoor unit will start operation
3 AHU Comm. Kit outputs fan signal(220-230V) according to return(room) air condition
IDU A-B

LG Wired
remote controller
Room air
Return air

Fan output
signal*
(220-230V)

Control
panel
Relay
Relay

ON
ON
OFF
OFF

Coil


Summary of return air control with PRCKA1
LG Centralized controllers

MULTI V™ Series

CEN A-B

LAN

IDU A-B

LG Wired
remote controller

BACnet
Modbus
Lonworks

AHU Communication KIT
(Model : PRCKA1)
TB 12-13-14

AHU #1

Main features

Power
Supply
220-230 V

TB 4-5

- For simple AHU control with return air control
TB 1-2-3

: Refrigerant coil on/off, mode change, fan on/off, etc
Coil

- Support LG Centralized controllers

Fan
Signal
Output

- EEV Kit or TXV(Expansion) Kit can be applicable
Function

By LG Remote controller
Control

AHU Comm. Kit ON/OFF

O

Outdoor unit operation
(Compressor operation)

-

Mode

Monitor

LG Wired
remote controller

LG Wired remote
controller
O

AHU #2

O

Fan/Heating/Coolin Fan/Heating/Coolin
g
g
High/Mid/Low

High/Mid/Low

Return(room) air temperature

Cooling 18~ 30℃
Heating 16 ~ 30℃

O

Supply air temperature control via
DDC

With IO Module
(PVDSMN000)

-

Error status

-

O

TB 1-2-3

Coil

Fan Step

Power
Supply
220-230 V

TB 4-5

To Indoor units or
other AHUs

Fan
Signal
Output


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