Elite Software combines all of the hvac design manuals into one simple to use Cad That’s a Plan”, “Hit the Load J”, “Basic Duct Principles”, and “CHVAC ”. chvac logo Commercial Load Calculation Software. Calculates heating and cooling loads for commercial applications, compliant with ASHRAE Standard Elite Software Chvac Medical Gas and Vacuum Systems Handbook NFPA Health Care Facilities The B-Line series Cable Tray Manual
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I used at least half dozen of calculation software and don’t like much those who try to do work for you, in more complex projects such automatism can cause nasty errors. When I drop the humidity of the air below a certain point, reheat coil should be added in order to reheat the air to maintain the sens zone temperature.
All of these methods employ more sophisticated procedures than what Manual J uses.
Elite leaves such decisions to the judgement of the designer, but cautions that Manual J tends to calculate lower cooling loads than ASHRAE, especially for glass. Am I missing something here? Rhvac Online is based on Manual J and is intended primarily for detached residential buildings.
I always leave it, i.
Each designer has to make their own decision on whether a particular method is appropriate for use on their specific project.
The supply fan should be considered a sens gain during the summer and sens loss during the winter? I will try to look at it when reaching HAP. If the roof is exposed to a conditioned area, select Roof on Exposed Beams roof material selections 17A through 17L and enter dimensions of inclined and flat portions of the roof in the Room Data page. Promoting, selling, recruiting, coursework and thesis posting is forbidden.
At best, software is your reliable helper who does less errors in tedious tasks. An excessive infiltration rate often occurs when the building is in excess of square feet.
Another reason for excessively high loads could be windows. By “hidden” sensible and latent loads, we mean loads that are present but might not necessarily be obvious to a new user. In Manual J, east glass has one summer load factor. Red Flag This Post Please let us know here why this post is inappropriate. Join your peers on the Internet’s largest technical engineering professional community.
There are several things that you should check and that might be responsible for low loads:. Since the sensible gain for windows and skylights at the system level is always based on the average load procedure plus any AED excursion load, the sum of the room cooling airflows will be larger than that of the system in this case.
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The Rhvac Online program allows you to have several systems within the same project and specify different design conditions for each one of them on System Data page. Close this window and log in.
ACCA Manual J is a residential load calculation procedure that makes many simplifying assumptions so that it is reasonably easy to perform manual heat gain and heat loss calculations. You can also obtain load reports for every system and zone in your project see the Select Reports topic. Since the ratio of a room’s sensible gain to the sensible gain of the system is probably not equal to the ratio of the rooms sensible loss to the sensible loss of the system, the rooms’ heating and cooling airflows are probably different, so the sum of the room airflows may not equal that of the system.
You should rate your buildings conservatively on their construction.
Why does HAP subtract the supply fan load and Elite doesn’t? Call Elite Software at oror visit www. It is very “modern” concept, and I don’t know if any standard supports it.
I have learnt a great deal. Nevermind that east glass has more heat gain in the morning and less heat gain in the afternoon.
Elite Software Chvac 8.02.32
Click Here to join Eng-Tips and talk with other members! As mentioned above, most peak heating loads calculations do not subtract loads from fan or internal gains – for reasons of safety margin. Why elitr the sum of the room airflows not equal the airflow of the system? You can assign a zone and a system for every room in your project see Room Data topic. Fan adding heat to supply air is not adding load but actually reducing it.
It is provided for your convenience, so that, instead of entering the same room component over and over again, you could simply copy it from the Default room.