Lecture 17: VAV and Terminal Reheat Systems Material prepared by GARD Analytics, Inc. and University of Illinois at Urbana-Champaign under contract to

Lecture 17: VAV and Terminal Reheat Systems

Material prepared by GARD Analytics, Inc. and University of Illinoisat Urbana-Champaign under contract to the National Renewable Energy

Laboratory. All material Copyright 2002-2003 U.S.D.O.E. - All rights reserved

2

Purpose of this Lecture

Gain an understanding of how to: Define Air Loops and Zone Equipment

input for various types of fan systems VAV Terminal Reheat

Review various keywords already covered and show how they interact to form a complete system definition

VAV Systems in EnergyPlus

4

VAV with Reheat and Outside Air Example

Air Loop contains the Mixed Air System, Supply Fan and the Cooling Coil

Outside air system will be discussed later in more detail

Zone Equipment Loop contains the Splitter, VAV Box Air Distribution Unit, the zones, and the Return Air Path with the Mixer.

North

Zone

East

Zone

Resistive

Zone

Supply Fan

Re

turn

Air

Mix

er

Zo

ne

Air

Sp

litter

CC

VAV Box:ReHeat

VAV Box:ReHeat

Mixed OutsideAir Box

Relief Air

Outside Air

VAV Box:ReHeat

North

Zone

East

Zone

Resistive

Zone

Supply Fan

Re

turn

Air

Mix

er

Zo

ne

Air

Sp

litter

CC

VAV Box:ReHeat

VAV Box:ReHeat

Mixed OutsideAir Box

Relief Air

Outside Air

VAV Box:ReHeat

Chilled Water Return

Chilled Water SupplyReturn Air

5

VAV with Reheat Air Loop

Air Primary Loop, Typical Terminal Reheat 1, !- Primary Air Loop Name Reheat System 1 Controllers, !- Name: Controller List Reheat System 1 Avail List, !- Name: System Availability Manager List 1.3, !- Primary air design volumetric flow rate {m3/s} Air Loop Branches, !- Air Loop Branch List Name , !- Air Loop Connector List Name Air Loop Inlet Node, !- ReturnAir AirLoop Inlet Node Return Air Mixer Outlet Node, !- ZoneEquipGroup Outlet Node Zone Equipment Inlet Node, !- SupplyAirPath ZoneEquipGroup Inlet Nodes Air Loop Outlet Node; !- AirLoop Outlet Nodes

Supply Fan

CCMixed OutsideAir Box

Relief Air

Outside AirSupply Fan


Relief Air

Outside Air



6

VAV with Reheat Controller and Branch

Lists

CONTROLLER LIST,

Reheat System 1 Controllers, !- Name

Controller:Simple, !- Controller Type 1

Main Cooling Coil Controller; !- Controller Name 1

BRANCH LIST,

Air Loop Branches, !- Branch List Name

Air Loop Main Branch; !- Branch Name 1

Supply Fan


Relief Air



Relief Air

Outside Air



7

VAV with Reheat Main Branch

BRANCH, Air Loop Main Branch, !- Branch Name 1.3, !- Maximum Branch Flow Rate {m3/s} OUTSIDE AIR SYSTEM, !- Comp1 Type OA Sys 1, !- Comp1 Name Air Loop Inlet Node, !- Comp1 Inlet Node Name Mixed Air Node, !- Comp1 Outlet Node Name PASSIVE, !- Comp1 Branch Control Type FAN:SIMPLE:VariableVolume, !- Comp2 Type Var Vol Supply Fan 1, !- Comp2 Name Mixed Air Node, !- Comp2 Inlet Node Name Cooling Coil Air Inlet Node, !- Comp2 Outlet Node Name ACTIVE, !- Comp2 Branch Control Type < cont’d on next slide>

Supply Fan


Relief Air



Relief Air

Outside Air



8

VAV with Reheat Main Branch (cont’d)

COIL:Water:DetailedFlatCooling, !- Comp3 Type Detailed Cooling Coil, !- Comp3 Name Cooling Coil Air Inlet Node, !- Comp3 Inlet Node Name Air Loop Outlet Node, !- Comp3 Outlet Node Name PASSIVE; !- Comp3 Branch Control Type

Supply Fan


Relief Air



Relief Air

Outside Air



9

VAV with Reheat System Availability

Manager

SYSTEM AVAILABILITY MANAGER LIST,

Reheat System 1 Avail List, !- Name

SYSTEM AVAILABILITY MANAGER:SCHEDULED, !- System Availability Manager type 1

Reheat System 1 Avail; !- System Availability Manager name 1

SYSTEM AVAILABILITY MANAGER:SCHEDULED,

Reheat System 1 Avail, !- Name

FanAndCoilAvailSched; !- Schedule name

Supply Fan


Relief Air



Relief Air

Outside Air



10

VAV with Reheat Supply Fan

FAN:SIMPLE:VariableVolume, Var Vol Supply Fan 1, !- Fan Name CoolingCoilAvailSched, !- Available Schedule 0.7, !- Fan Total Efficiency 600.0, !- Delta Pressure {Pa} 1.3, !- Max Flow Rate {m3/s} 0.20, !- Min Flow Rate {m3/s} 0.9, !- Motor Efficiency 1.0, !- Motor In Airstream Fraction 0.35071223, !- FanCoefficient 1 0.30850535, !- FanCoefficient 2 -0.54137364, !- FanCoefficient 3 0.87198823, !- FanCoefficient 4 0.000, !- FanCoefficient 5 Air Loop Inlet Node, !- Fan_Inlet_Node Cooling Coil Air Inlet Node; !- Fan_Outlet_Node

Supply Fan


Relief Air



Relief Air

Outside Air



11

VAV with Reheat Cooling Coil

COIL:Water:SimpleCooling,

Main Cooling Coil 1, !- Coil Name

CoolingCoilAvailSched, !- Available Schedule

autosize, !- UA of the Coil {W/K}

autosize, !- Max Water Flow Rate of Coil {m3/s}

0.9, !- Leaving Relative Humidity of Coil

Main Cooling Coil 1 Water Inlet Node, !- Coil_Water_Inlet_Node

Main Cooling Coil 1 Water Outlet Node, !- Coil_Water_Outlet_Node

Mixed Air Node 1, !- Coil_Air_Inlet_Node

Main Cooling Coil 1 Outlet Node; !- Coil_Air_Outlet_Node

Supply Fan


Relief Air



Relief Air

Outside Air



12

VAV with Reheat Cooling Coil Controller

Controller:Simple, Main Cooling Coil Controller, !- Name TEMP, !- Control variable Reverse, !- Action FLOW, !- Actuator variable Air Loop Outlet Node, !- Control_Node Cooling Coil Water Inlet Node, !- Actuator_Node 0.001, !- Controller Convergence Tolerance: delta temp from setpoint {C} 0.0011, !- Max Actuated Flow {m3/s} 0.0; !- Min Actuated Flow {m3/s}

Supply Fan


Relief Air



Relief Air

Outside Air



13

VAV with Reheat Zone Supply Air Path

North

Zone

East

Zone

Resistive

Zone

Re

turn

Air

Mix

er

Zo

ne A

ir Sp

litter

VAV Box:ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

North

Zone

East

Zone

Resistive

Zone

Re

turn

Air

Mix

er

Zo

ne A

ir Sp

litter

VAV Box:ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

ZONE SUPPLY AIR PATH,

TermReheatSupplyPath, !- Supply Air Path Name

Zone Equipment Inlet Node, !- Supply Air Path Inlet Node

Zone Splitter, !- KEY--System Component Type

Zone Supply Air Splitter; !- Component Name

14

VAV with Reheat Zone Splitter

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zo

ne A

ir Sp

litter

VAV Box: ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zo

ne A

ir Sp

litter

VAV Box: ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

ZONE SPLITTER,

Zone Supply Air Splitter, !- Splitter Name

Zone Equipment Inlet Node, !- Inlet_Node

Zone 1 Inlet Node, !- Outlet_Node_1


Zone 3 Inlet Node; !- Outlet_Node_3

15

VAV with Reheat Zone Return Air Path

North

Zone

East

Zone

Resistive

Zone

Re

turn

Air

Mix

er

Zo

ne A

ir Sp

litter

VAV Box:ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

North

Zone

East

Zone

Resistive

Zone

Re

turn

Air

Mix

er

Zo

ne A

ir Sp

litter

VAV Box:ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

ZONE RETURN AIR PATH,

TermReheatReturnPath, !- Return Air Path Name

Return Air Mixer Outlet, !- Return Air Path Outlet Node

Zone Mixer, !- KEY--System Component Type 1

Zone Return Air Mixer; !- Component Name 1

16

VAV with Reheat Zone Mixer

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zo

ne A

ir Sp

litter

VAV Box: ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zo

ne A

ir Sp

litter

VAV Box: ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

ZONE MIXER,

Zone Return Air Mixer, !- Mixer Name

Return Air Mixer Outlet, !- Outlet_Node

Zone 1 Outlet Node, !- Inlet_Node_1


Zone 3 Outlet Node; !- Inlet_Node_3

17

VAV with Reheat Zone Equip Configuration

CONTROLLED ZONE EQUIP CONFIGURATION,

RESISTIVE ZONE, !- Zone Name

Zone1Equipment, !- List Name: Zone Equipment

Zone1Inlets, !- List Name: Zone Inlet Nodes

, !- List Name: Zone Exhaust Nodes

Zone 1 Node, !- Zone Air Node Name

Zone 1 Outlet Node; !- Zone Return Air Node Name

Resistive

Zone

VAV Box: Reheat

Resistive

Zone

VAV Box:

18

VAV with Reheat Zone Equipment List

ZONE EQUIPMENT LIST,

Zone1Equipment, !- Name

AIR DISTRIBUTION UNIT, !- KEY--Zone Equipment Type 1

Zone1TermReheat, !- Type Name 1

1, !- Cooling Priority

1; !- Heating Priority

Resistive

Zone

VAV Box: Reheat

Resistive

Zone

VAV Box:

19

VAV with Reheat Air Distribution Unit

AIR DISTRIBUTION UNIT,

Zone1TermReheat, !- Air Distribution Unit Name

Zone 1 Reheat Air Outlet Node, !- Air Dist Unit Outlet Node Name

SINGLE DUCT:VAV:REHEAT, !- KEY--System Component Type 1

Zone 1 VAV System; !- Component Name 1

NODE LIST,

Zone1Inlets, !- Node List Name

Zone 1 Reheat Air Outlet Node; !- Node_ID_1

Resistive

Zone

VAV Box: Reheat

Resistive

Zone

VAV Box:

20

VAV with Reheat VAV Terminal Unit

SINGLE DUCT:VAV:REHEAT, SPACE1-1 VAV Reheat, !- Name of System ReheatCoilAvailSched, !- Availability schedule for VAV System SPACE1-1 Zone Coil Air In Node, !- Damper Outlet Node SPACE1-1 ATU In Node, !- Damper Inlet Node 0.33, !- Maximum air flow rate {m3/s} 0.3, !- Min air flow fraction SPACE1-1 Zone Coil Water In Node, !- Control node COIL:Water:SimpleHeating, !- Reheat Component Object SPACE1-1 Zone Coil, !- Name of Reheat Component 0.0003, !- Max Reheat Water Flow {m3/s} 0.0, !- Min Reheat Water Flow {m3/s} SPACE1-1 In Node, !- Reheat Air Outlet Node 0.001, !- Convergence Tolerance REVERSE ACTION; !- Damper Heating Action

21

VAV with Reheat Reheat Coil

COIL:Water:SimpleHeating, SPACE1-1 Zone Coil, !- Coil Name ReheatCoilAvailSched, !- Available Schedule 300., !- UA of the Coil {W/K} 0.0003, !- Max Water Flow Rate of Coil {m3/s} SPACE1-1 Zone Coil Water In Node, !- Coil_Water_Inlet_Node SPACE1-1 Zone Coil Water Out Node, !- Coil_Water_Outlet_Node SPACE1-1 Zone Coil Air In Node, !- Coil_Air_Inlet_Node SPACE1-1 In Node; !- Coil_Air_Outlet_Node

Resistive

Zone

VAV Box: Reheat

Resistive

Zone

VAV Box:

Terminal Reheat Systems in EnergyPlus

23

TermReheat Controller and Branch

ListsSupply Fan


Relief Air



Relief Air

Outside Air

CONTROLLER LIST,

Reheat System 1 Controllers, !- Name

Controller:Simple, !- Controller Type 1

Main Cooling Coil Controller; !- Controller Name 1

BRANCH LIST,

Air Loop Branches, !- Branch List Name

Air Loop Main Branch; !- Branch Name 1

24

TermReheat Main Branch

Supply Fan


Relief Air



Relief Air

Outside Air

BRANCH, Air Loop Main Branch, !- Branch Name 1.3, !- Maximum Branch Flow Rate {m3/s} FAN:SIMPLE:VariableVolume, !- Comp1 Type Var Vol Supply Fan 1, !- Comp1 Name Air Loop Inlet Node, !- Comp1 Inlet Node Name Cooling Coil Air Inlet Node, !- Comp1 Outlet Node Name ACTIVE, !- Comp1 Branch Control Type COIL:Water:DetailedFlatCooling, !- Comp2 Type Detailed Cooling Coil, !- Comp2 Name Cooling Coil Air Inlet Node, !- Comp2 Inlet Node Name Air Loop Outlet Node, !- Comp2 Outlet Node Name PASSIVE; !- Comp2 Branch Control Type

25

TermReheat System Availability

ManagerSupply Fan


Relief Air



Relief Air

Outside Air

SYSTEM AVAILABILITY MANAGER LIST,

Reheat System 1 Avail List, !- Name

SYSTEM AVAILABILITY MANAGER:SCHEDULED, !- System Availability Manager type 1

Reheat System 1 Avail; !- System Availability Manager name 1

SYSTEM AVAILABILITY MANAGER:SCHEDULED,

Reheat System 1 Avail, !- Name

FanAndCoilAvailSched; !- Schedule name

26

TermReheat Supply Fan

Supply Fan


Relief Air



Relief Air

Outside Air

FAN:SIMPLE:ConstVolume,

Supply Fan 1, !- Fan Name

FanAndCoilAvailSched, !- Available Schedule

0.7, !- Fan Total Efficiency

600.0, !- Delta Pressure {Pa}

1.3, !- Max Flow Rate {m3/s}

0.9, !- Motor Efficiency

1.0, !- Motor In Airstream Fraction

Air Loop Inlet Node, !- Fan_Inlet_Node

Cooling Coil Air Inlet Node; !- Fan_Outlet_Node

27

TermReheat Cooling Coil

Supply Fan


Relief Air



Relief Air

Outside Air

COIL:Water:SimpleCooling,

Main Cooling Coil 1, !- Coil Name

CoolingCoilAvailSched, !- Available Schedule

autosize, !- UA of the Coil {W/K}

autosize, !- Max Water Flow Rate of Coil {m3/s}

0.9, !- Leaving Relative Humidity of Coil

Main Cooling Coil 1 Water Inlet Node, !- Coil_Water_Inlet_Node

Main Cooling Coil 1 Water Outlet Node, !- Coil_Water_Outlet_Node

Mixed Air Node 1, !- Coil_Air_Inlet_Node

Main Cooling Coil 1 Outlet Node; !- Coil_Air_Outlet_Node

28

TermReheat Cooling Coil Controller

Supply Fan


Relief Air



Relief Air

Outside Air

Controller:Simple, Main Cooling Coil Controller, !- Name TEMP, !- Control variable Reverse, !- Action FLOW, !- Actuator variable Air Loop Outlet Node, !- Control_Node Cooling Coil Water Inlet Node, !- Actuator_Node 0.001, !- Controller Convergence Tolerance: delta temp from setpoint {C} 0.0011, !- Max Actuated Flow {m3/s} 0.0; !- Min Actuated Flow {m3/s}

29

TermReheat Zone Thermostat

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zone A

ir Splitte

rVAV Box:ReHeat

VAV Box:ReHeat

VAV Box:ReHeat

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zone A

ir Splitte

rVAV Box:ReHeat

VAV Box:ReHeat

VAV Box:ReHeat

ZONE CONTROL:THERMOSTATIC, Zone 1 Thermostat, !- Thermostat Name RESISTIVE ZONE, !- Zone Name Zone Control Type Sched, !- Control Type SCHEDULE Name SINGLE HEATING SETPOINT, !- Control Type #1 Heating Setpoint with SB, !- Control Type Name #1 SINGLE COOLING SETPOINT, !- Control Type #2 Cooling Setpoint with SB; !- Control Type Name #2

30

TermReheat Thermostat Setpoints

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zone A

ir Splitte

r

VAV Box:ReHeat

VAV Box:ReHeat

VAV Box:ReHeat

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zone A

ir Splitte

r

VAV Box:ReHeat

VAV Box:ReHeat

VAV Box:ReHeat

SINGLE HEATING SETPOINT, Heating Setpoint with SB, !- Name Heating Setpoints; !- Setpoint Temperature SCHEDULE Name

SINGLE COOLING SETPOINT, Cooling Setpoint with SB, !- Name Cooling Setpoints; !- Setpoint Temperature SCHEDULE Name

31

TermReheat Zone Supply Air Path

North

Zone

East

Zone

Resistive

Zone

Re

turn

Air

Mix

er

Zo

ne A

ir Sp

litter

VAV Box:ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

North

Zone

East

Zone

Resistive

Zone

Re

turn

Air

Mix

er

Zo

ne A

ir Sp

litter

VAV Box:ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

ZONE SUPPLY AIR PATH,

TermReheatSupplyPath, !- Supply Air Path Name

Zone Equipment Inlet Node, !- Supply Air Path Inlet Node

Zone Splitter, !- KEY--System Component Type

Zone Supply Air Splitter; !- Component Name

32

TermReheat Zone Return Air Path

North

Zone

East

Zone

Resistive

Zone

Re

turn

Air

Mix

er

Zo

ne A

ir Sp

litter

VAV Box:ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

North

Zone

East

Zone

Resistive

Zone

Re

turn

Air

Mix

er

Zo

ne A

ir Sp

litter

VAV Box:ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

ZONE RETURN AIR PATH,

TermReheatReturnPath, !- Return Air Path Name

Return Air Mixer Outlet, !- Return Air Path Outlet Node

Zone Mixer, !- KEY--System Component Type 1

Zone Return Air Mixer; !- Component Name 1

33

TermReheat Zone Splitter

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zo

ne A

ir Sp

litter

VAV Box: ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zo

ne A

ir Sp

litter

VAV Box: ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

ZONE SPLITTER,

Zone Supply Air Splitter, !- Splitter Name

Zone Equipment Inlet Node, !- Inlet_Node



Zone 3 Inlet Node; !- Outlet_Node_3

34

TermReheat Zone Mixer

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zo

ne A

ir Sp

litter

VAV Box: ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

North

Zone

East

Zone

Resistive

Zone

Retu

rn A

ir M

ixe

r

Zo

ne A

ir Sp

litter

VAV Box: ReHeat

VAV Box: ReHeat

VAV Box: ReHeat

ZONE MIXER,

Zone Return Air Mixer, !- Mixer Name

Return Air Mixer Outlet, !- Outlet_Node



Zone 3 Outlet Node; !- Inlet_Node_3

35

TermReheat Zone Equip Configuration

Resistive

Zone

VAV Box: ReHeat

Resistive

Zone

VAV Box: ReHeat

CONTROLLED ZONE EQUIP CONFIGURATION,

RESISTIVE ZONE, !- Zone Name

Zone1Equipment, !- List Name: Zone Equipment

Zone1Inlets, !- List Name: Zone Inlet Nodes

, !- List Name: Zone Exhaust Nodes

Zone 1 Node, !- Zone Air Node Name

Zone 1 Outlet Node; !- Zone Return Air Node Name

36

TermReheat Zone Equipment List

Resistive

Zone

VAV Box: ReHeat

Resistive

Zone

VAV Box: ReHeat

ZONE EQUIPMENT LIST,

Zone1Equipment, !- Name

AIR DISTRIBUTION UNIT, !- KEY--Zone Equipment Type 1

Zone1TermReheat, !- Type Name 1

1, !- Cooling Priority

1; !- Heating Priority

37

TermReheat Air Distribution Unit

Resistive

Zone

VAV Box: ReHeat

Resistive

Zone

VAV Box: ReHeat

AIR DISTRIBUTION UNIT,

Zone1TermReheat, !- Air Distribution Unit Name

Zone 1 Reheat Air Outlet Node, !- Air Dist Unit Outlet Node Name

SINGLE DUCT:VAV:REHEAT, !- KEY--System Component Type 1

Zone 1 VAV System; !- Component Name 1

NODE LIST,

Zone1Inlets, !- Node List Name

Zone 1 Reheat Air Outlet Node; !- Node_ID_1

38

TermReheat VAV Terminal Unit

SINGLE DUCT:VAV:REHEAT, SPACE1-1 VAV Reheat, !- Name of System ReheatCoilAvailSched, !- Availability schedule for VAV System SPACE1-1 Zone Coil Air In Node, !- Damper Outlet Node SPACE1-1 ATU In Node, !- Damper Inlet Node 0.33, !- Maximum air flow rate {m3/s} 0.3, !- Min air flow fraction SPACE1-1 Zone Coil Water In Node, !- Control node COIL:Water:SimpleHeating, !- Reheat Component Object SPACE1-1 Zone Coil, !- Name of Reheat Component 0.0003, !- Max Reheat Water Flow {m3/s} 0.0, !- Min Reheat Water Flow {m3/s} SPACE1-1 In Node, !- Reheat Air Outlet Node 0.001, !- Convergence Tolerance REVERSE ACTION; !- Damper Heating Action

39

TermReheat Reheat Coil

Resistive

Zone

VAV Box: ReHeat

Resistive

Zone

VAV Box: ReHeat

COIL:Water:SimpleHeating, SPACE1-1 Zone Coil, !- Coil Name ReheatCoilAvailSched, !- Available Schedule 300., !- UA of the Coil {W/K} 0.0003, !- Max Water Flow Rate of Coil {m3/s} SPACE1-1 Zone Coil Water In Node, !- Coil_Water_Inlet_Node SPACE1-1 Zone Coil Water Out Node, !- Coil_Water_Outlet_Node SPACE1-1 Zone Coil Air In Node, !- Coil_Air_Inlet_Node SPACE1-1 In Node; !- Coil_Air_Outlet_Node

40

Summary

This lecture highlighted the EnergyPlus input necessary to define most VAV and Terminal Reheat systems Air loop and zone equipment input Thermostat input Fan and coil component input Controller input

Documents

Lecture 17: VAV and Terminal Reheat Systems Material prepared by GARD Analytics, Inc. and University of Illinois at Urbana-Champaign under contract to