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CHILLED WATER SYSTEM OPTIMIZATION

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ARI Released The New Standard in December 1998. Available through ... Carrier Corporation. 780 Dedham St. Canton, Ma 02021. Phone 781-774-6336. Fax 781-774-6399 ... – PowerPoint PPT presentation

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Title: CHILLED WATER SYSTEM OPTIMIZATION


1
CHILLED WATER SYSTEM OPTIMIZATION
2
Introductions
David A. Greco Sales Engineer Carrier Corporation
3
Agenda
  • How Are Systems Evaluated Today ? (ARI
    550/590-98)
  • How Will Chiller Systems Be Evaluated Tomorrow ?
    / Why ?

4
How Are Water Chillers Evaluated Today?
  • Full Load Efficiency
  • and
  • Part Load Efficiency (IPLV)

5
ARI Released The New Standard in December 1998
  • Available through
  • the ARI web site
  • WWW.ARI.ORG

6
ARI PART LOADWEIGHTING FACTORS
7
Condenser Water Turndown
90
85
80
75
ARI 550/590-98
70
65
60
25
50
75
100
8
Per ARI 550/590-98 White Paper IPLV represents
an average single chiller application, it may
not be representative of a particular job
installation.
9
Evaluating Systems
10
Building Load Profiles
ARI Load Profile
Bldg Load
Temp Bin
11
Evaluating Systems
  • The IPLV Formula Does Not Describe Reality
  • Building Load Profiles
  • Multiple Chillers

12
Mix 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
13
Three Chillers 33/33/33Operation
Chiller Load
14
Three Chillers 33/33/33Operation
Chiller Load
15
Three Chillers 33/33/33Operation
Chiller Load
16
Evaluating Systems
  • The IPLV Formula Does Not Describe Reality
  • Building Load Profiles
  • Multiple Chillers
  • Local Weather Data

17
Evaluating 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.

18
There is a Better Solution
Chiller System Optimizer Will Evaluate YOUR System
19
It 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

20
The 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

21
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22
(No Transcript)
23
Inputs
24
Chiller Plant Efficiency Comparison
25
Energy Cost By Month
26
System PLV Report
27
System Load Profiles
Chillers operating at lower condenser water are
able to provide more capacity. This equates to
less cooling towers and pumps operating.
28
ACCUMETER 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

29
Condenser Temperature Profiles
30
System Performance Profile
31
1500 Ton, Water Cooled Chiller Job
The Best Solution...
32
Or... Is There A Better Solution?
33
CONSTANT SPEED OR VFDs
  • DOES THE OPTIMAL SYSTEM CONSIST OF
  • ALL CONSTANT SPEED MACHINES?
  • VFD ON THE LEAD MACHINE?
  • VFD ON ALL MACHINES?

IT DEPENDS
34
WHATS A BETTER TOWER CHOICEBIG or SMALL
TOWER?
??
Larger towers mean colder condenser water temps
for the chiller
35
What 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

36
(No Transcript)
37
David A. Greco
  • Carrier Corporation
  • 780 Dedham St.
  • Canton, Ma 02021
  • Phone 781-774-6336
  • Fax 781-774-6399
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