chiller vs vrf

5/28/2018 Chiller vs VRF

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Copyright 2008 All rights reserved LG Electronics Inc.

Chiller vs VRF system

LG Electronics Inc.LGEHQ CAC Team


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1. Design Comparison

VRF is very sim pl i f ied refr igerant pip ing system. More f lex ib le than w ater pip ing .

Chiller

MULTI V Plus VRF)hiller systemOutdoor unit (air-cooled type)

Indoor unit

Refrigerant piping

Chiller

FCU (Fan Coil Unit)

AHU (Air Handling Unit)

Systemcomposition

FeatureCooling tower

Water piping, Duct working

Water pumps

System concept

Design CommissioningOperation MaintenanceInstallation Reliability


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Network

Feature Chiller system

Complicated wiring

MULTI V Plus VRF)

Simple wiring


Easy network wir ing

1. Design Comparison Network design

ACP


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1. Design Comparison Total management


[Manufacturer]

VAV boxessupplier

Controlsystem

Feature Chiller system MULTI V Plus VRF)

(For VRF) Manufactu rer prov ide al l equipment

Simple control structure

No additional control provider

Central control and energy monitoring with

low cost available

Complicated control structure, additional

control manager in the system needed,

increasing cost

Third part control provider needed,

interconnectivity problems.


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Design Commissioning

MULTI V Plus VRF)hiller systemThe systems condition only the

necessary rooms with regardto user demands.

The systems commonly condition the entire building

at predetermined times, with no regard to user demands.very hot midnight, weekend, holiday etc)

Capacitycontrol

FeatureAfter of f ice hours operat ion, VRF could b e operated for the us er demands.

Operating Area

< Limited operation>

Individual operation

Operation MaintenanceInstallation Reliability

2. Operation Comparison


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Temperature

control

Feature Chiller system

Require

1 or 2

MULTI V Plus (VRF)

Very precise

0.5

Precise temperature co ntro l

30

25

20

15

10 20 30 40 50 60 70

Cooling

MIN.

Chiller systemMULTI V system

Ro

omt

emp.

0.5 0 C from set point


Temp. control2. Operation Comparison


7/267/14 Copyright 2008 All rights reserved LG Electronics Inc.

VRF system doesnt need a duct space.

SpaceEfficiency

Feature MULTI V Plus VRF)Small refrigerant space

Chiller systemLarge duct space


Space (Duct working)3. Installation Comparison



Chiller

Pump

Boiler

Coolingtower

(On the rooftop)

(Machine room drawing)

OutdoorUnit

(On the rooftop)

(Rooftop drawing)

VRF system is no need for a machine room .

Installationspace

Feature MULTI V Plus VRF)No need a machine room

Chiller systemNeed a machine room


Installation space3. Installation Comparison



Eff ic ient use of space is pos sib le for VRF system

Chiller systemSpace

Efficiency

Feature

P P

1/3

CHILLER SYSTEM

Large pipe shaft is needed for water piping

MULTI V Plus VRF)

VRF System

Small pipe shaft is needed


Space (Pipe shaft)3. Installation Comparison



VRF system exp ansion is very easy w ith extra outdoor & indoo r uni t .

Chiller system

SystemExpansion

FeatureCapacity addition is difficult

as additional mechanical room, pump, cooling tower,

panel and piping is required.

MULTI V Plus VRF)

System Expansion is Easy

+


System expansion3. Installation Comparison



1 step Commiss ion ing6 steps Commiss ion ing

MULTI V Plus VRF)hiller systemCommissioning

FeatureThere are a lot of commiss ioning points fo r the chi l ler system

6 Steps Commissioning 1 Step Commissioning

Water cooled chiller (3)

(4)


NO. of commissioning point4. Commissioning Comparison



Maintenance

FeatureMaintenance cos ts for a Mult i V is low er than chi l led water systems.

Water cooled chiller (3)

(4)

MULTI V Plus VRF)Filter cleaning

Heat exchanger cleaning

Cycle check by notebook (LG MV)

Chiller systemFilter cleaning

Duct cleaning

Water pipe maintenance

Periodical oil change, overhaul

Pump

Water treatment

Cooling tower cleaning


Maintenance list5. Maintenance Comparison



(For Ch il ler Water treatment is required for c lean water)

Watertreatment

Feature Chiller systemWater treatment is required(deficient service can cause legionary disease in the system)

MULTI V Plus VRF)

No water treatment is needed


Water treatment5. Maintenance Comparison



Scalecleaning

Feature Chiller system MULTI V Plus VRF)

< The system is consist of refrigerant pipes >

No water pipes : No scale (use refrigerant) Need to clean the water pipes

System efficiency drop & origin of germs

After 2~3year After 5~6year After 7~8year10% 25~30% 35~40%

thickness of scale

E

nergy

Loss

Unit : mm

Unit : %

(For Chi l ler) Maintenance & cleaning per iodical ly by exclu sive com pany


Scale cleaning5. Maintenance Comparison



Maintenance Staff5. Maintenance Comparison


MaintenanceStaff

Feature Chiller system MULTI V Plus VRF)(For Ch il ler) Cert i f ied maintenan ce staff is needed

No need special maintenance staff.

Economic and easy maintenance

The system requires certified maintenance

staff not only for chillers but also pumps,

boilers, cooling towers etc.

More expensive maintenance cost.

< Maintenance Staff>



Pipe Erosion6. Reliability Comparison


PipeErosion

Feature Chiller system MULTI V Plus VRF)(For Ch il ler) Cert i f ied maintenan ce staff is needed

Refrigerant does not cause corrosion therefore

no pipe damage occurred

Pipe erosion can cause leakage.

System capacity reduction.

Brines use increase corrosion, anti corrosion

additives needed

< Water pipe leakage >



Category Product Initial Cost(USD) Initial Cost(USD)Total

Water

Cooled C

hiller

Chiller Price 355,484877,097AHU / Cooling Tower / Pump, Pr

ice 148,065Installation 383,871

VRV Multi V 874,498 1,109,660Installation 235,161

April 2008

Cooling Only

Air Duct Included

Initial Cost Running Cost Maintenance Cost Total cost

Type of Building: Shopping Mall

Total area 9,000 m2 : 6 storey Building :1,500 m2/floor

Actual cooling area : 1,500 m2 * 80 % * 6 Floor = 7,200 m2

Cooling Load (Tr) / m2 : 700 Tr *12000 Btu/Hr = 1,166 Btu/m2

Equipment : Water cooled chiller /Multi V unit

- Water Cooled Chiller :Trane Water cooled chiller

350 Tr x 2 set =700 Tr + 300 Back up

Pumps =400 Tr x 2 set

AHU = 8000 CFM x 36 set

Cooling Tower =1200 Gpm x 3 +3 Back up

- VRF System :LG Multi V Plus II

48 Hp x 19 set=912 Hp 726 Tr

Air conditioning time : Operation

- 13 hour a day (09:00 ~ 22:00)

- 30 days a month

- average load by month

Equipments & Installation cost

MULTI V vs Chiller7. Economic analysis



Multi V running cost is 65 % compare to chiller

Category ProductRunning

Cost

(USD)TotalWater

Cooled Chiller

Chiller Price308,697AHU / Coolin

g Tower / Pump, Price

Multi V Price 200,158Based on KW data chiller/Multi V

Based on, Thailand electrical standard

ARI-Air conditioning & Refrigeration Institute

$0k

$100k

$200k

$300k

$400k

year

2n

d4th

6th

8th

10th

12th

14th

Chiller

Multi V

Running costSavings up to15thyr : 35%

Chiller

Multi V

Electrical cost





Category Price MaintenanceCost(USD)Total

Water

Cooled Chiller

Chiller Price32,177AHU / Cooling

Tower / Pump,Price

Multi V Price 11,468$0k

$100k

$200k

$300k

$400k

year

2nd 4th 6th 8th 10

th12th

14th

Chiller

Multi V

Chiller

Multi V

MaintenanceCost savingsUp to 15thyr: 66%

Maintenance breakdown

Chiller system -31 USD / Rt / yr.- 6 times/yr

Multi V- 48 USD / Indoor / yr.- 6 times/yr

- 145 USD / Outdoor / yr.- 6 times/yr

Multi V maintenance cost is 24 % compare to chiller

Maintenance cost





Category Chiller system VRF system Remarks

EconomicAnalysis

Initial cost (USD) 877,097 927,057Running cost

(USD) 308,698 200,158

Shoppingmall6F,

9,000

Maintenace cost(USD) 32,177 11,468

Total cost (USD) 1,217,972 1,138,683BEP - 1.7 years

7. Economic analysis



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LCC (Life Cycle Cost for 15 years) : Chiller 5.99 M$ > Multi V 4.27 M$ (71%)

BEP (Break Even Point) : 1.7 Years

LCC (15 years) BEP

1st year 2ndyear 3rd year 4th year

- 20K$

+10K$

+40K$

+70K$

BEP :1.7 Years

$0k

$1000k

$2000k

$3000k

$4000k

$5000k

$6000k

$7000k

year

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

13th

14th

15th

Chiller

Multi V

Cost savings: 29%

BEP :1.7 Years

8. LCC

CC


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Chiller Multi V

1,228

1,109

877

32

308 20011

1,3217%

Product &

Installation

Maintenance

Electrical Fee

Chiller Multi V

5,992

23%15%8%

77% 73%

4%

4,27435%

Product &Installation

Maintenance

Electrical Fee

Initial Cost (1styear)( K US$ )

LCC (15 years)

8. LCC

A C t ti ti


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Type of building : Shopping mall

Water cooled Chiller :350 TR x 2 set=700 Tr + 300Tr (back up)VRF system:48 Hp x 19 set = 912 Hp (726TR)Commercial Building : (Shopping Mall - 9,000 Total Area) - 6 storey building:1500 per floorActual cooling area : 1,500 * 80 * 6F = 7,200Cooling load(TR) / : 700TR * 12,000Btu/h/TR 7,200 = 1167 Btu/

Capacity Price EA Sub total (THB) Sub total (USD)350 RT 3,960,000 2 7,920,000 255,484

300 RT 3,100,000 1 3,100,000 100,000

400 RT 500,000 2 1,000,000 32,258

400 RT 500,000 1 500,000 16,129

1200 GPM 100,000 3 300,000 9,677

840 GPM 90,000 3 270,000 8,710

8,000 CFM 70,000 36 2,520,000 81,290

15,610,000 57 503,548

9,000,000 33% 290,323

2,900,000 11% 93,548

11,900,000 43 383,87127,510,000 100 887,419

48 Hp 957,000 19 18,183,000 586,548

Indoor unit ceiling duct 10 Hp 91,355 90 8,221,950 265,224

2,915 90 262,350 8,463

81,125 1 81,125 2,617

141,570 1 141,570 4,567

1,650 57 94,050 3,034

3,300 38 125,400 4,045

27,109,445 79 874,498

Indoor unit ceiling duct

36,000 90 3,240,000 104,516

7,290,000 21 235,16134,399,445 100 1,109,660

I lot

back up cooling tower (open type)

Duct working

45,000

back up chiller (screw type)

Wired remote controller

Centrol controller (ACP)

Centrol control software (AC Manager)

Sub totalTotal (Product + Installation)

Pump (Evaporator) + 1 back up

AHU

Outdoor unit

Sub total

130,645

Y branch

ODU joint

90 4,050,000

VRF Sub total

Sub total

Outdoor unit

Total (Product + Installation)

Product

Installation

duct work

piping & electrical work

Water CooledChiller(Screwtype)

Classification

Pipe & Insulation

Valve & Acc.

Power & Control

Product

Installation

Chiller (screw type)

Cooling tower (open type)

Pump (Condenser) + 1 back up

App. Cost estimation

A A t l i t


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Energyconsumption

/ unitTotal

energyconsumption

kW) kW)271 2 542

14.9 2 29.84 Load 100% 75% 50% 25%

55.2 6 331.2 Chillier 542 179 84 47

2.35 48 112.8 Others 474 474 474 474

1015.84 Total 1016 653 558 521Outdoor Unit 48 HP-R410a 42 19 798

Indoor Unit 10 HP CCD 0.8 90 72 Load 100% 75% 50% 25%

870.0 VRF 870 609 287 16513

30

100% kW portion

1% 100% 542 100% Used by Schedule 4.2.2 condition42% 75% 179.2 33% electrical charge in Thailand45% 50% 83.9 15% THB / month USD

12% 25% 47.2 9% VRF 517,076 16,680

Chiller 797,469 25,725

Gap 280,393 9,045Operation

hourskWh / day kWh / month

Operation

hourskWh / day kWh / month

0.1 113.1 3,393.0 0.1 132.06 3,961.78

5.5 3,325.1 99,754.2 5.5 3,565.60 106,967.95 VRF 200,158

5.9 1,679.5 50,386.1 5.9 3,262.78 97,883.37 Chiller 308,698

1.6 257.9 7,736.0 1.6 812.82 24,384.67

13.0 5 375.6 161 269.3 13.0 7,773.3 233,197.8

VRF system

Cooling load portion IPLV100% cooling load

VRF MULTI V system) Chiller system

75% cooling load

50% cooling load

25% cooling load

VRF

AHU-10 tr

Totaloperating time / day (hours)

operating day / month

ChillerPower consumption

Load

operating cost 1

year

hiller system

Category EA

Total

Power consumption under partial loadWaterCooledChillerScrewtype)

Chiller-350 Tr

Cooling tower-1260 GPM

Pump-50 Hp

App. Actual running cost

A M i t t


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Cost Unit350 RT 105,000 Baht/unit 2 210,000

400 RT 60,000 Baht/unit 2 120,000

1200 GPM 15,600 Baht/unit 6 93,600

15 RT 2,000 Baht/unit 70 140,000

2 persons 20,000 Baht/unit 12 240,000

803,600840 Hp 3,000 Baht/unit 90 270,000

Outdoor unit 4,500 19 85,500

355,500

THB USD RemarksChiller 997,500 32,177 6 times / year

270,000 6 times / year

85,500 6 times / year355,500 11,468

Pump

TotalVRF

1500 THB / indoor unit, year

4500 THB / ODU module, ye

950 THB / RT, year

Control engineer

Chiller(Screwtype)

Chiller (Screw type)

Cooling tower

AHU

Total

TotalVRF

Indoor unit

A noteategory Capacity Maintenance cost EA Maintenancecost / year

App. Maintenance cost

A E ffi i (IPLV)


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ARI Released The New Standard in 2003

Available throughthe ARI web site:WWW.ARI.ORG

Portion by cooling load (%)

IPLVOR

APLV

=

0.01 + 0.42 + 0.45 + 0.12A B C D

1

kW / kW (ARI Part load weighting factors)

1% 42% 45% 12%

100% 75% 50% 25%

WEIGHTED (%)

ARI550/590-2003

Cooling Load

App. Energy efficiency (IPLV)

chiller vs vrf

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