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Old 08-02-2010, 01:18 PM   #1
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Building HVAC Instructional Unit


We're trying to build an HVAC instructional unit to be used in a school laboratory. Its purpose is to help students understand all the cycles involved in the system. Can anyone help with suggestions on how to begin sizing and selecting components? Thanks!!

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Old 08-02-2010, 01:58 PM   #2
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Building HVAC Instructional Unit


Some background info needed first:
1) Are you a HVAC tech and what kind of experience do you have?
2) What aspects of HVAC are you interested in: Heat pumps, electric furnaces, basic AC cycles?
3) Who is the project geared to? High school students, entry level HVAC guys?

The reason I ask is the field I/we work in is getting huge with all the different types of systems, electronic controls etc and we want to narrow down what you are looking for.

NATE has good training info for entry level guys:http://www.natex.org/
Helps later with getting a job if you have some qualifications to show.

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Last edited by yuri; 08-02-2010 at 02:00 PM.
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Old 08-02-2010, 02:16 PM   #3
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Building HVAC Instructional Unit


Quote:
Originally Posted by yuri View Post
Some background info needed first:
1) Are you a HVAC tech and what kind of experience do you have?
2) What aspects of HVAC are you interested in: Heat pumps, electric furnaces, basic AC cycles?
3) Who is the project geared to? High school students, entry level HVAC guys?

The reason I ask is the field I/we work in is getting huge with all the different types of systems, electronic controls etc and we want to narrow down what you are looking for.
We are a group of undergrad mechanical engineering students taking this on for our senior project.
We would like to:
- have the unit in a university thermal fluids lab for undergrad
- heating/re-heating, cooling, humidification, dehumidification
- we want to be able to vary fan speed and measure pressure/temperature at different points in the cycle (*important)
- we don't need to have the refrigeration cycle transparent, since there's already an instructional unit for that, so we were thinking of just installing a refrigeration unit into the hvac unit

thanks for your help!
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Old 08-02-2010, 02:36 PM   #4
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Building HVAC Instructional Unit


How much dough $$ do you guys have? Sounds like an expensive project. You need a electric furnace or air handler with strip heaters and a variable speed ECM motor/blower and a reasonably full size of proper ductwork. If not the fan will overspeed or hunt. A 2 stage AC unit will give you de-humidifying ability. You are going to need a LOT of space and equipment similar to what you have in a residential house system. Do you have the room for these units?
Look at page 4 in this brochure for a representative system:http://www.lennox.com/pdfs/brochures...onditioner.pdf
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Last edited by yuri; 08-02-2010 at 02:40 PM.
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Old 08-02-2010, 03:13 PM   #5
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Building HVAC Instructional Unit


We have a good amount of space, but we were thinking to do something on a smaller scale, maybe fit everything on 2-3 utility carts, similar to this unit
http://www.usdidactic.com/images/pro...160000%202.pdf
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Old 08-02-2010, 03:40 PM   #6
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Building HVAC Instructional Unit


Sounds German to me, look at the voltage and type of 3 phase power it requires B4 ordering it.
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Old 08-02-2010, 06:31 PM   #7
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Building HVAC Instructional Unit


Some what simple. Somewhat hard.

Get a 6,00 to 9,000 BTU med temp condenser. get a matching coil for it. A rheostat for fan speed control. 4 Cooper X copper X MIP Tees, for each refrigerant line. Plus the gauges for each tee.

A small electric heat kit. 1 10"X10"X3" metal pan. 2-200 watts heat lamps.

Decide if you want line or low voltage control. Get your thermostat, humidistat, and dehumidistat i n those voltages. And the proper relay if you go with low voltage control.

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