Title: CHILLED WATER SYSTEM OPTIMIZATION
1CHILLED WATER SYSTEM OPTIMIZATION
2Introductions
David A. Greco Sales Engineer Carrier Corporation
3Agenda
- How Are Systems Evaluated Today ? (ARI
550/590-98) - How Will Chiller Systems Be Evaluated Tomorrow ?
/ Why ?
4How Are Water Chillers Evaluated Today?
- Full Load Efficiency
- and
- Part Load Efficiency (IPLV)
5ARI Released The New Standard in December 1998
- Available through
- the ARI web site
- WWW.ARI.ORG
6ARI PART LOADWEIGHTING FACTORS
7Condenser Water Turndown
90
85
80
75
ARI 550/590-98
70
65
60
25
50
75
100
8Per ARI 550/590-98 White Paper IPLV represents
an average single chiller application, it may
not be representative of a particular job
installation.
9Evaluating Systems
10Building Load Profiles
ARI Load Profile
Bldg Load
Temp Bin
11Evaluating Systems
- The IPLV Formula Does Not Describe Reality
- Building Load Profiles
- Multiple Chillers
12Mix Of Chillers Sold 1997 / 1998
3.3 4 Chillers
1 Chiller
14.3
3 Chillers
15.4
1 Chiller Into Existing Multi- Chiller
Installation
23.7
43.3
2 Chillers
85 Are Multiple Chiller Jobs
Source Review of Industry Shipments
13Three Chillers 33/33/33Operation
Chiller Load
14Three Chillers 33/33/33Operation
Chiller Load
15Three Chillers 33/33/33Operation
Chiller Load
16Evaluating Systems
- The IPLV Formula Does Not Describe Reality
- Building Load Profiles
- Multiple Chillers
- Local Weather Data
17Evaluating Systems
- The IPLV Formula Does Not Describe Reality
- Building Load Profiles
- Multiple Chillers
- Local Weather Data
- Mixing Chillers
- Economizer Operation
- Demand Charges
- Tower Efficiency..etc.
18There is a Better Solution
Chiller System Optimizer Will Evaluate YOUR System
19It is best to use a comprehensive analysis that
reflects the ...
- Actual weather data
- Building load characteristics
- Number of chillers
- Operational hours
- Economizer capabilities
- Energy drawn by auxiliaries such as pumps and
cooling towers, - especially for multiple chiller systems
20The CSO will help
- Estimate chiller plant energy cost
- Compare various system to determine which one is
most cost effective - Compare VFD vs Constant speed
- Compare cooling towers large vs small
- Calculate savings from economizer cooling cycles
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23Inputs
24Chiller Plant Efficiency Comparison
25Energy Cost By Month
26System PLV Report
27System Load Profiles
Chillers operating at lower condenser water are
able to provide more capacity. This equates to
less cooling towers and pumps operating.
28ACCUMETER FLOW CONTROL
1281
.535
kW/Ton
Tons
1048
.434
85oF
80oF
75oF
60oF
70oF 65oF
Entering Condenser Water Temperature
- Result Increased Tons, DecreasedkW/Ton with
Lower Entering Condenser Water Temperature
29Condenser Temperature Profiles
30System Performance Profile
311500 Ton, Water Cooled Chiller Job
The Best Solution...
32Or... Is There A Better Solution?
33CONSTANT SPEED OR VFDs
- DOES THE OPTIMAL SYSTEM CONSIST OF
- ALL CONSTANT SPEED MACHINES?
- VFD ON THE LEAD MACHINE?
- VFD ON ALL MACHINES?
IT DEPENDS
34WHATS A BETTER TOWER CHOICEBIG or SMALL
TOWER?
??
Larger towers mean colder condenser water temps
for the chiller
35What Does This Do For Me?
- True System Modeling
- Minimize Assumptions
- Enhance Your Productivity
- Easy To Compare Different Chiller Systems
- Put a Value On Different Scenarios
- Good Tool To Use With Your Customers
- Shows You Provided The Best System
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37David A. Greco
- Carrier Corporation
- 780 Dedham St.
- Canton, Ma 02021
- Phone 781-774-6336
- Fax 781-774-6399