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Lecture Objectives:. Finish with HVAC systems Discuss airflow modeling in energy simulation tools. HVAC systems. Detailed list of HVAC System Types is in eQUEST help file Most common / most important: - Packaged Single Zone DX with Furnace Packaged Multizone with Furnace

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lecture objectives
Lecture Objectives:
  • Finish with HVAC systems
  • Discuss airflow modeling in energy simulation tools
hvac systems
HVAC systems
  • Detailed list of HVAC System Types is in eQUEST help file
  • Most common / most important:
  • - Packaged Single Zone DX with Furnace
  • Packaged Multizone with Furnace
  • Packaged VAV with Elec Reheat
  • Packaged Multizone with Elec Heat
  • Standard VAV with HW Reheat
  • 4-Pipe Fan Coils with HW Heat
  • Dual Duct Air Handler with HW Heat
  • ………
basic purpose of hvac control
Basic purpose of HVAC control
  • Daily, weekly, and seasonal swings make HVAC control challenging
  • Highly unsteady-state environment
  • Provide balance of reasonable comfort at minimum cost and energy
  • Two distinct actions:
        • 1) Switching/Enabling: Manage availability of plant according to schedule using timers.
        • 2) Regulation: Match plant capacity to demand
control models integrated in hvac system simulation
Control models integrated in HVAC system simulation

Example:

Economizer (fresh air volume flow rate control)

Controlled device is damper

- Damper for the air

- Valve for the liquids

fresh

air

damper

mixing

recirc.

air

T & RH sensors

difference between perfect and non perfect control and impact on energy consumption
Example: Heat exchanger control

Modulating (Analog) control

Cooling coil

air

water

Difference between perfect and non perfect control and impact on energy consumption

x

(set point temperature)

the control in hvac system only pi
The control in HVAC system – only PI

Proportional

Integral

value

Set point

Proportional

affect the slope

Integral

affect the shape after

the first “bump”

Set point

slide8

Combined 1) Air flow and 2) Energy flow modeling Example: Night Cooling/Hybrid Ventilation:The IONICA Office Building, Cambridge, UK

coupling

Energy

Simulation

Program

Air Flow

Program

Coupling

Twall,CFM, Tsupply

Data:

geometry

weather

materials

IAQ

V,T,…

Energy cons.

Tnear surface, h surface

coupled airflow and energy simulation software components and data flow
Coupled Airflow and Energy Simulation SoftwareComponents and Data flow