Honeywell AUTOMATIC CONTROL Engineering Manual page 306

CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
High Temper a ture Water Hea ting System Contr
District Heating Applications ............................................................................................................ 382
ENGINEERING MANUAL OF AUTOMATIC CONTROL
Control Principles For Steam Heating Devices ................................... 374
General ........................................................................................... 374
Modulating Steam Coil Performance .............................................. 374
Oversized Valve .......................................................................... 374
Correctly Sized Valve .................................................................. 375
Supply And Return Main Pressures ................................................ 375
System Design Considerations For Steam Coils ............................ 375
Low Temperature Protection For Steam Coils ................................ 376
ol........................................................................................... 376
Introduction .......................................................................................... 376
High Temperature Water (HTW) Heating ........................................ 376
High Temperature Water Safety ...................................................... 377
HTW Control Selection ........................................................................ 377
HTW Valve Selection ........................................................................... 377
Valve Style ...................................................................................... 378
Valve Body Materials ...................................................................... 378
Valve Trim ....................................................................................... 378
Valve Packing ................................................................................. 378
Valve Flow Characteristics .............................................................. 378
Actuators ......................................................................................... 378
Valve Size ....................................................................................... 378
Valve Location ................................................................................. 378
Instantaneous Converter Control ........................................................ 379
HTW Coils ........................................................................................... 380
HTW Space Heating Units .............................................................. 380
Storage Converters ......................................................................... 380
Multizone Space-Heating HTW Water Converters .......................... 381
HTW Steam Generators ................................................................. 381
Introduction .......................................................................................... 382
Heat Sources .................................................................................. 382
The Distribution Network ................................................................. 382
The Substation ................................................................................ 383
Abbreviations ....................................................................................... 383
Definitions ............................................................................................ 384
Symbols ............................................................................................... 384
System Configuration .......................................................................... 385
Heat Generation .............................................................................. 385
Heat Distribution Network ............................................................... 385
Hot Water System Control .............................................................. 385
Steam System Vs Hot Water System ............................................. 385
Hot Water Pipeline System ............................................................. 385
Booster Pump Station ..................................................................... 385
Pressure Reducing Stations ........................................................... 386
Mixing Station ................................................................................. 386
Key Points ....................................................................................... 386
Heat Transfer Substations .............................................................. 386
Direct Heat Transfer Substations ................................................ 386
Indirect Heat Transfer Substations ............................................. 388
Hybrid Heat Transfer Substations ............................................... 389
Control Applications ............................................................................. 390
DDC Control of High Performance Substation ................................ 390
DDC Control of a Small House Substation ..................................... 392
Control of Apartment Building Substations
with Domestic Hot Water ............................................................ 393
Hybrid Building Substation .............................................................. 396
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