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Comparison of VRF system and
Chiller system
1
1. Outline VRF systems (Variable Refrigerant Flow) Outline & Feature
1. Individual room control is possible 2. Partial load operation is possible 3. No need to transport of Air or Water (refrigerant gas only) 4. Facility space is small 5. High COP & Energy saving 6. Advanced Control System Application
• • • •
Office Hotel, Condominium Hospital School (University) -for Individual room control building
2
- All inverter compressor can be back-up inverter operation continues.
- To maximize life span, starting order of compressors are switched.
Competitor D Back-up operation = ON / OFF control only
compressor failed
inverter
KX4
Fixed speed
Back-up operation = inverter control
compressor failed
inverter
3
KX4 is quiet… noise level 68
66
64
62
60
Much quieter with “Silent Mode”
58
MHI(KX4) A B
56
B' C
54 22.4
28
33.5
40
45
50.4
56
61.5
68
73.5
80
85
90
96
101
107
113
118
124
130
136
4
Indoor Units KX4 offers a wide range of indoor units (14 types/77models)
No.of No.of I/D I/D types models
MHI
14
77
Competitor D
11
65
Ceiling cassette 4-way FDTA
4-way (compact)
FDTCA
2-way
1-way
FDTWA
FDTSA
Ducted 1-way
middle static high static middle static pressure pressure pressure (compact)
FDTQA
FDUMA
FDUA
FDURA
Floor standing
compact
Wall mouted
Ceiling suspended
exposed
hidden
Fresh air heat
FDQMA
FDKA
FDEA
FDFLA
FDFUA
SAF
** A dry contact is equipped on both indoor (CNT connector) and outdoor units (CNS connector) which can be connected to the fire alarm system
5
Control Systems (with SUPERLINK) KX4 offers wide variation, provides best solution. ＜KX4 Control systems with SUPER LINK＞
Classification
Type
Model
Connectable Electric I/D units power (Maximum) calculation
Individual controller
Wired
RC-E1R
1
−
Wireless
RCN-TC-W-ER etc.
1
−
SＣ-SLA1-ER
16
−
SC-SLA2A-ER
48
−
SC-SLA3-ER
144
−
SC-SLB3-ER
144
○
SC-WGW-AR
96
−
SC-WGW-BR
96
○
BACnet
SC-BGW-AR
96
−
LONworks
SC-LGW-AR
96
−
Centralised controller
Touch screen
Inter face unit
WEB(PC windows) gateway
BMS gateway
6
Chiller systems Outline & Feature
System
1. Individual room control is difficult 2. Partial load operation not possible (To use even one FC unit, central chiller operation is necessarily) 3. Need to transport of Air or Water 4. Facility space is large 5. Operation for one big room is efficient
Application
・ Factory ・ Gymnasium ・ Office, Restaurant -for large room and space
7
Comparison
better ○： sufficient △: can be improved ◎：
Evaluated item Economical efficiency
Air conditioning grade
Flexibility
Safety, maintenance
Workability and others
VRF Systems
Chiller Systems
Initial cost (equipment + installation)
○
○
Running cost
◎
○
Facility space
◎
△
Zoning
○
○
Temperature/humidity control
◎
○
Applicability for partial load
◎
△
Individual operation and control
◎
△
Distress in the event of trouble
◎
△
Ease of individual measurement
○
△
Safety against hazard
◎
○
Maintainability
○
△
Ease of installation
○
△
Installation term reduction
○
△
8
VRF VS CHILLER COMPARISON
9
10
11
5
3. Others
Heat source equipment [291] (16.0)
-Typical Office Building Elevator etc., Sanitation & Others [373] (20.5) Energy consumption of building [1817] (100) Lighting [586](32.3)
Heat source [364] (20.0) Heat source auxiliary equipment [73] (4.0) Exhaust fan [198] (10.9) Medium transportation for air-conditioning [494] (27.2)
Air-conditioning fan [173] (9.5)
Air-conditioning [858](47.2)
Pump for air-conditioning [123] (6.8)
[ ] : Yearly energy consumption per square [MJ/m2･yr], ( ) : Percentage makeup against total energy consumption (%) 12
Functions of Required for the Air Conditioning System the Building from now on
Flexibility ・ Change of partition ・ Change of layout ・ Variation of heat generated by OA equipment Maintainability and controllability ・ Easy maintainability of equipment ・ Easy Operation method
Comfort ・ Thermal comfort differs for each individual human beings ・ Various work time bands
Requirements for air conditioning in the building from now on
of
Energy saving ・ Heat recovery ・ Reduction of transportation power ・ Start/stop control of Individual unit Safety and reliability ・ Protection against earthquake, fire and water leakage 13
The trend of Air-conditioner for sophisticated buildings
