Modeling and Analysis of CH HVAC

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Author(s): Rishel
Year: 1999

Language: English
Pages: 155

TABLE OF CONTENTS......Page 1
LIST OF TABLES......Page 3
LIST OF FIGURES......Page 5
System Descriptions......Page 13
Low chiller (T issues......Page 17
Objective......Page 19
MODELING......Page 23
Model......Page 24
Rich’s Method......Page 29
Manufacturer’s data......Page 30
Air-side Pressure Drop......Page 32
Manufacturer’s data......Page 35
Fan model......Page 37
Air Handler Performance Characteristics......Page 38
Manufacturer’s data......Page 42
Compressor Model......Page 43
Revised Compressor Model......Page 45
Heat transfer calculation......Page 48
Pressure drop calculation......Page 52
Heat transfer calculation......Page 54
Pressure drop calculation......Page 56
Chiller Comparison......Page 57
Performance Characteristics......Page 61
Constant Speed Pumping......Page 64
Variable Speed Pumping......Page 66
Cooling Tower Model......Page 72
Cooling Tower NTU Calculation......Page 75
Cooling Tower Fan Model......Page 76
Piping Model......Page 78
Chilled Water Reset......Page 80
Tower minimum set point......Page 84
Free Cooling......Page 85
Multiple Chiller Scheduling......Page 86
Chilled Water Set Point Reduction......Page 89
Check Valve......Page 91
Single Loop, Variable Flow Rate......Page 92
LOAD PROFILES AND WEATHER DATA......Page 94
Atlanta......Page 96
Phoenix......Page 97
Chicago......Page 98
Air Conditioning & Refrigeration Institute......Page 99
PERFORMANCE STUDIES......Page 100
Base Case......Page 101
Other Load Profiles......Page 105
Effects of Air Handler Degradation......Page 107
Increased Air Handler Capacity......Page 108
Low Efficiency Chiller Analysis......Page 109
Multiple Chiller Plant Analysis......Page 110
Base Case......Page 111
Reducing Chilled Water Set Point......Page 117
Effects of Air Handler Degradation on System Capacity......Page 119
Increasing Air Handler Capacity......Page 120
Greater Capacity......Page 122
Control Strategy......Page 123
Summary......Page 124
RECOMMENDATIONS......Page 125
BASE CASE, SINGLE LOOP MODEL......Page 126
BASE CASE, PRIMARY-SECONDARY SYSTEM......Page 139
References......Page 154