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