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Cooling and Heating Load Calculation SoftwareHelpful Member! 

hepa99 (Mechanical) (OP)
11 Jan 09 16:03
guys, can you share what's HVAC load calculation software you are using and what's your comment and experience?

I'm looking for residential/commercial HVAC load calculation software that can use in USA and other country (ASIA, etc.)

appreciate your relpy. thanks!
imok2 (Mechanical)
11 Jan 09 16:13
Manual "J" for resedential from ACCA

manual 'N" for commercial from ACCA
trashcanman (Mechanical)
12 Jan 09 13:48
I use Elite Chvac 7.01.  Works fine, except for a building with a lot of zones, you have to calculate all zones just to see the results of a change in 1 zone.
Dan1978 (Mechanical)
12 Jan 09 17:05
We use Wrightsuite Universal in our office. It uses the ACCA Manual "N", or the ASHRAE methods, Radiant Time Series and the traditional method. It has a graphical interface where you can load a floor plan and trace your different rooms or zones into the program directly. Its OK for medium sized buildings, but for larger spaces the graphical interface is tedious as you cant zoom to see the extents of your building much beyond 150'

It's the best program I've seen though, much simpler and easier to use than others mentioned. There residential programs are good too. They have worked out a lot of bugs in their latest release and their technical support is pretty good.

hepa99 (Mechanical) (OP)
6 Apr 09 7:33
guys anybody use Trane (trane trace) and Carrier (E-20II) cooling load software?

CptHk (Mechanical)
6 Apr 09 8:24
We use Elite Chvac 7.1 as mentioned above.  It is good for loads only.

Now that we are doing simulations we also have Trane Trace 700 and that is all half our office uses now.  I have more complaints with the simulation portion, but for loads my biggest complaints are how windows are input, it has no window type option, so each wall needs window are defined.

Trace has a nice 62.1-2004 ventilation rate calculation option that saves me time from having to do the calcs on a separate spreadsheet that we had to do when we only had Elite.
Helpful Member!  cdmac122395 (Mechanical)
6 Apr 09 14:21
I've used both Trane and Carrier.  My personal preference is Carrier.  It comes down to basically for me that I like the way Carrier organzies it inputs and printouts.  The Information is easy to find and they have good tech support from my experiences.
hepa99 (Mechanical) (OP)
6 Apr 09 16:52
does HAP (Hourly Analysis Program)have cooling and heating load estimate for commercial and residential?
cdmac122395 (Mechanical)
6 Apr 09 17:46
Well,  I'm not quite sure what you are asking me, but the program is a load calculating program.  So I guess the answer to your question is yes.  That is exactly what I use it for.  Now, it might also be able to do an energy analysis and stuff, but I use it for load calculating.  The analysis is performed the same was for commercial and residential.  So it doesn't really prompt you for what the analysis is for.  But you can input glass types, and wall types that are already in the program or you can make your own.  I've used Trane and Chvac as well and my preference is HAP.

If you have any more specific questions about it let me know.  I hope I answered your questions.
TwinScrew (Mechanical)
6 Apr 09 21:03
Carrier Block Load is great for basic CRU's, etc...

HAP (Hourly Analysis Program) is much more advanced, but is highly favoured with many of my consultants.

You can also design around different systems, and compare them.. (Splits, Pkg., CW, etc.).

Here's an overview that explains a lot for you:,2047,CLI1_DIV12_ETI496_MID4355,00.html
hepa99 (Mechanical) (OP)
7 Apr 09 10:16
i read HAP feature and it didn't say it include Residential load calculation. I think its for Commercial only. Correct me if i'm wrong.

Also do you know if they have 30day trial?

Actually i'll use this for my PERSONAL use only. It's expensive though ($1,495)

cdmac122395 (Mechanical)
7 Apr 09 10:23

What is different about calculating the residential loads than commercial loads?  I input my walls, roofs, windows the same.  The lighting and occupancy schedules might be different, but I use HAP to calculate residential loads all the time.  I'm not sure why a particular program that can calculate commercial building loads wouldn't be able to calculate residential loads.

Maybe you are talking about a systems analysis with residential type furnaces and stuff.  I just model the system as a constant volume roof top unit in that case.

What else am I missing ?
msb01 (Mechanical)
10 Apr 09 11:10
You can use DesignBuilder software for your load calculations ( You can download fully functional 30 days evaluation version. This way you do not need to pay. It uses ASHRAE heat balance method for load calculations. It uses E+ simulation engine.  
hepa99 (Mechanical) (OP)
11 Apr 09 3:54
thanks for the info msb01, but the price is very expensive compare to HAP.

i'm just waiting for HAP-Carrier support to give me a link to try their software (hopefully for 30days) before purchasing the full license.

cvanoverbeke (Mechanical)
12 Apr 09 8:29
Our firm has been using Trane Trace 700 Load Design for 3 years.  It is good software.  They have a 30 day trial if you want to use it personally.

hepa99 (Mechanical) (OP)
14 Apr 09 20:39
I need to talk first to carrier local carrier distributor before they give me trial version or buy the software.

this is sucks! carrier software support won't give me the link to download trial version of HAP without approval of their local carrier distributor....worse thing is the distributor is slowwwwwww....
KiwiMace (Mechanical)
15 Apr 09 1:26
Buy lots of chillers and you will get this software for the asking.
walkes (Mechanical)
19 Apr 09 10:14
If price is a factor you can try eQuest.  It is energy simulation software that is available for free download. However you may have difficulty in finding the load information you are looking for as it tends to produce thousands of pages of reports in the detailed output.  The simplified graphical outputs may help though.

Find it here:

PS. I normally use Carrier HAP for both residential and commercial load calculations.  For quick energy modelling I use eQuest.
chicopee (Mechanical)
19 Apr 09 20:43
The problem with software is that many people using them have little knowledge how to calculate heating and coolimg loads and consequently these people will have no "feel" on their results.
In MA you can download worksheets that allows you to input initial conditions and proceed step by step with the calculations.  Once you understand the formulae, than you can appreciate the value of such sofware.
Using these worksheets for resential,commercial and light industrial is a good place to start before embarking on larger projects.
HVAC68 (Mechanical)
23 Apr 09 8:29
I have been using Carrier HAP since it was first launched.  A good program - Lot of bugs initially, more or less taken care now.  A good and user friendly program.  Has a very helpful "HELP" function.  If you get stuck somewhere, just press the "F1" button and a help screen appears which clears the doubts.

Good luck.


hepa99 (Mechanical) (OP)
7 May 09 16:02
can somebody share your experience between HAP ver4.4 vs System Design Load of carrier?

Price is 50% difference. Since i will use this for my own, i guess System Design Load is good enough?
jnam82 (Mechanical)
14 May 09 13:30
Chicopee, what is MA, where can I download the worksheets?
chicopee (Mechanical)
15 May 09 11:54
MA are the intials to Massachusetts.
The MA State Building Code 780CMR sheet #760.22. Complementing is the REScheck Compliance Certificate 2003IECC.  Additional info is 522 CMR 9.00.
This material goes back to the early part of 2000 however I don't believe much has changed.
montoy (Mechanical)
27 May 09 21:01
Chicopee, can you post upload that worksheet here? I'm scheduled to attend a HAP training in a couple of months but I have no experience using the software although I'm now trying to teach myself how to use the Trace 700 since I have the Demo version. Maybe this said worksheet can enlighten me.
marcoh (Mechanical)
28 May 09 7:46
I have used HAP for many years now and have never really had any issues.  The only real limitation is complicated shading geometries need to be approximated with the limited input options.

If simulating Carrier chillers you can get chiller performance maps for the exact chiller from Carrier which makes life easy.

We also use IES software which is very capable but has a very long steep learning curve.

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