Final Project Presentation

• On Monday, same classroom at noon

• PowerPoint (5 minutes presentation)• Upload the file before the class

• Approximately 6-7 slides (a minute per slide)• Problem introduction • Model development - specific problem• Results • Results • Discussion• Conclusions

Manufacturer data

• http://www.titus-hvac.com/ecatalog/subcategory.aspx?refid=37&subref=130

• http://www.mestek.com/company-directory.asp#.U1_bi1dkW1c

• http://www.price-hvac.com/Catalog/Section_F1/CatalogData.aspx

• http://www.krueger-hvac.com/

• http://www.trane.com/commercial/north-america/canada/en/products-systems/equipment/air-handlers/packaged-climate-changer-LPC.html

• http://www.johnsoncontrols.com/content/us/en/products/building_efficiency/products-and-systems/integrated_hvac_systems/Industrial___Commercial_HVAC_Equipment/airside_products/york_custom_ahus.html

• http://www.lennoxcommercial.com/products/packaged-rooftop-units/

• …….

VAV repeaters:

http://www.nailor.com/onlineCatalog09/CAT-06/CATBSD.pdf ETL models

http://www.dhtcoils.com/?gclid=CPus9rO8wMkCFRCGaQodfqUCXw

ObjectivesLearn about

1) Control for HVAC systems

- Economizers (Psychrometrics) and control

- Heat recovery systems (Psychrometrics)

2) Some advance HVAC systems

desiccant, enthalpy, sensible wheel

EconomizerEconomizer (fresh air volume flow rate control)

mixing

damper

fresh

air

T & RH sensors

recirc.

air

Controlled device is damper

- Damper for the air

- Valve for the CC

Economizer – cooling regime

How to control the fresh air volume flow rate?

% fresh air

Minimum for

ventilation

100%

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

Sensible and Enthalpy and Desiccant wheels

Sensible and Enthalpy Wheels

Heat recovery system in NMS building at UT

Sensible Enthalpy

Desiccant wheel

»Figure 3 – A desiccant-based cooling system combined with regenerative heat exchanger, vapor compression cooling, and evaporative

humidifier (hybrid system).

Commercial HVAC Systems

Single zone Multi zone

VAVCAVVAV CAV

All Hydroinic

that relay on

infiltration

With and

without

reheaters

DOAS with

fan coils

or radiant

ceilings

With

reheaters

Dual

duct

Dual

ductDOAS with

fan coils

With and

without

humidity

control

This is not the complete list !

Residential System

Residential vs. Commercial systems

• Course focus was on HVAC equipment that is used in both: residential and commercial systems

• Emphasize on the application in commercial systems

Course objectives• Apply fundamental physical principles to HVAC

design• Describe and size each component in an HVAC

system• Design HVAC systems based on manufacturer’s

datasheets• Contrast residential systems with commercial

systems and use appropriate design techniques for each type of system

• Solve HVAC design problems with high-quality references