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Objectives. Learn about 1) Control for HVAC systems - Economizers (Psychrometrics) and control - Heat recovery systems (Psychrometrics) 2) Some advance HVAC systems desiccant, enthalpy, sensible wheel . Economizer. Economizer (fresh air volume flow rate control).

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Objectives
Objectives

Learn about

1) Control for HVAC systems

- Economizers (Psychrometrics) and control

- Heat recovery systems (Psychrometrics)

2) Some advance HVAC systems

desiccant, enthalpy, sensible wheel


Economizer
Economizer

Economizer (fresh air volume flow rate control)

Controlled device is damper

- Damper for the air

- Valve for the CC

fresh

air

damper

mixing

recirc.

air

T & RH sensors


Economizer cooling regime
Economizer – cooling regime

How to control the fresh air volume flow rate?

If TOA < Tset-point → Supply more fresh air than the minimum required

The question is how much?

Open the damper for the fresh air

and compare the Troom with the Tset-point .

Open till you get the Troom = Tset-point

If you have 100% fresh air and your

still need cooling use cooling coil.

What are the priorities:

- Control the dampers and then the cooling coils or

- Control the valves of cooling coil and then the dampers ?

Defend by SEQUENCE OF OERATION

the set of operation which HVAC designer provides to the automatic control engineer

% fresh air

100%

Minimum for

ventilation


Economizer cooling regime1
Economizer – cooling regime

Example of SEQUENCE OF OERATIONS:

If TOA < Tset-point open the fresh air damper the maximum position

Then, if Tindoor air < Tset-point start closing the cooling coil valve

If cooling coil valve is closed and T indoor air < Tset-point start closing the damper

till you get T indoor air = T set-point

Other variations are possible


Sequence of operation for the humidity control system design
Sequence of operation for the humidity control system design

Adiabatic

humidifier

CC

HC

SA

OA

  • mixing

RA

Define the sequence of operation for:

WINTER operation and:

- case when humidity is not controlled

- case when humidity is precisely controlled




Heat recovery system in nsm building at ut
Heat recovery system in NSM building at UT


Desiccant wheel

Desiccant wheel


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