http://forums.designmaster.biz/index.php Mon, 09 Apr 2012 17:22:46 +0000 60 http://forums.designmaster.biz/index.php?showtopic=1783
I'm designing a system where I mix air coming my heatpump and air coming from an hrv. Is that possible in DM? Can I have two supply lines blending into one?

Thanks,
Fred]]> Mon, 09 Apr 2012 17:22:46 +0000 http://forums.designmaster.biz/index.php?showtopic=1783 http://forums.designmaster.biz/index.php?showtopic=1782 While using Design Master HVAC, from time to time sporadically ghost lines from fittings/ducts are left on the screen. These bits and pieces are the same layer as the current layer. For example: I draw 24x12 duct with turning vanes. Multiple fittings, taps, etc are drawn including connections to diffusers. Then the cfm for the diffusers is reduced, resulting in smaller duct after the system is calculated. However, some of the previous size duct outlines, turning vanes, etc....bits and pieces are left on the screen. Re-calculating the system does no good. Even if you completely delete all the duct. diffucers, etc.....the bits and pieces remain. I have started always keeping DEFPOINTS layer current so that at least the bits do not plot. Any ideas?? Thu, 05 Apr 2012 17:59:34 +0000 http://forums.designmaster.biz/index.php?showtopic=1782 http://forums.designmaster.biz/index.php?showtopic=1781
I've modeled a room to have no CFM to it at all, only walls, roofs and windows cooling and heating load. Yet, when I run the calculations, it shows a Cooling Supply CFM (no Heating Supply CFM though) in the Supply Air Requirements?

I would attach a JPEG of the results, but the insert attachments and insert image functions don't work.

Thanks,]]> Tue, 27 Mar 2012 13:59:22 +0000 http://forums.designmaster.biz/index.php?showtopic=1781 http://forums.designmaster.biz/index.php?showtopic=1779 What I was wanting to do is:
1) layout diffuser positions.
2) give an air handler CFM
3) DM auto sizes diffuser volumes based on the heat load of the rooms that the diffusers are in and the given volume.

Please let me know if there is a way to do this.
Thanks
Matt]]> Tue, 21 Feb 2012 14:40:14 +0000 http://forums.designmaster.biz/index.php?showtopic=1779 http://forums.designmaster.biz/index.php?showtopic=1778
Does anyone know of a way to trick my model to take that into account?

Thanks,
Fred]]> Mon, 06 Feb 2012 18:12:40 +0000 http://forums.designmaster.biz/index.php?showtopic=1778 http://forums.designmaster.biz/index.php?showtopic=1708
It seems to me that no matter what system airflow you indicate to DM (Supply, Return, Exhaust, or Outside Air), it always performs the pressure drop calcs as if it were a supply duct. It always indicates positive pressures and never negative pressures. Is there an assumption made that if you reverse flow in a duct system, the pressure will be exactly the same? For example, if a supply system is calculated to require 1.234" of pressure. If cfm are locked and all the duct stays exactly the same, the only change is that flow is reversed, is it safe to say that the fan will require -1.234" of pressure? It's really more of an engineering question than a software question. Does reversing airflow create a mirror image of the static pressures (in real life)? Is it a simple exercise of changing positive to negative symbols? If reversability is the same, then this shouldn't really matter. I've had client reviewers reject my calcs because it's showing positive pressures on negative ductwork. Any advice? I can't get the attachments to work here.]]> Mon, 09 Jan 2012 16:09:17 +0000 http://forums.designmaster.biz/index.php?showtopic=1708 http://forums.designmaster.biz/index.php?showtopic=1703 Fri, 25 Nov 2011 14:35:43 +0000 http://forums.designmaster.biz/index.php?showtopic=1703 http://forums.designmaster.biz/index.php?showtopic=1672
I have a vertical duct running from floor to floor. The problem is, all my floors are on the same drawing. Is there a way to create the equivalent of a ''drawing to drawing'' link but on the same drawing?

Thanks,
Fred]]> Fri, 02 Sep 2011 17:39:20 +0000 http://forums.designmaster.biz/index.php?showtopic=1672 http://forums.designmaster.biz/index.php?showtopic=1671
Thanks,
Fred]]> Fri, 02 Sep 2011 14:57:14 +0000 http://forums.designmaster.biz/index.php?showtopic=1671 http://forums.designmaster.biz/index.php?showtopic=1669
I'm very new to this software, so I apologize if this is an obvious question. Is it possible to use DM-HVAC to insert a Mechanical Equipment Schedule (same as the Diffuser Schedule)?

Thanks,
Fred]]> Thu, 25 Aug 2011 14:19:09 +0000 http://forums.designmaster.biz/index.php?showtopic=1669 http://forums.designmaster.biz/index.php?showtopic=1666 I think a good addition to the schedules available would be to incorporate a ventilation schedule. I get more and more requests for documenting this from permit reviews. Mon, 08 Aug 2011 20:08:28 +0000 http://forums.designmaster.biz/index.php?showtopic=1666 http://forums.designmaster.biz/index.php?showtopic=1664
Is anybody using design master for ductwork layout and converting to CAD-Mech for fabrication?

Any input would be welcome.]]> Mon, 18 Jul 2011 21:07:00 +0000 http://forums.designmaster.biz/index.php?showtopic=1664 http://forums.designmaster.biz/index.php?showtopic=1663
Is there a list of software improvements/bug fixes & new features (HVAC only)?

What type of files can we export?

What type of files can we import?

Can it figure or output Reheat at no load conditions or do you still do this manually based on min. vav flow?

Thanks for any help.]]> Fri, 15 Jul 2011 12:02:39 +0000 http://forums.designmaster.biz/index.php?showtopic=1663 http://forums.designmaster.biz/index.php?showtopic=1649
Thanks,

George]]> Tue, 10 May 2011 23:20:45 +0000 http://forums.designmaster.biz/index.php?showtopic=1649 http://forums.designmaster.biz/index.php?showtopic=1639
Thanks,

George]]> Thu, 28 Apr 2011 23:16:39 +0000 http://forums.designmaster.biz/index.php?showtopic=1639 http://forums.designmaster.biz/index.php?showtopic=1636 In the lower right-hand corner of the Options dialogue box, check the Drawing is Metric box" as stated in the DM HVAC User Manual.

I am using DM HVAC 7 evaluation version.

Regards,

Jav]]> Tue, 05 Apr 2011 05:10:07 +0000 http://forums.designmaster.biz/index.php?showtopic=1636 http://forums.designmaster.biz/index.php?showtopic=1144
My question is if the Zone says it is 100% OA, why is the zone load not enough to cover 100%OA?


Thanks]]> Mon, 24 Jan 2011 18:04:40 +0000 http://forums.designmaster.biz/index.php?showtopic=1144 http://forums.designmaster.biz/index.php?showtopic=1019
I'm a newB here and have a question for the pros... Cities for my State are limited to just a few, are there any ways to add new ...cities to the selection list when starting a new job?

Thanks,]]> Wed, 17 Nov 2010 00:17:35 +0000 http://forums.designmaster.biz/index.php?showtopic=1019 http://forums.designmaster.biz/index.php?showtopic=1014
is there a way to extract from the DM database duct sizes and associated quatities. This would be very helpful for the larger projects.

Best,
John kitsalis, PE]]> Tue, 05 Oct 2010 03:00:01 +0000 http://forums.designmaster.biz/index.php?showtopic=1014 http://forums.designmaster.biz/index.php?showtopic=1011
http://wishlist.designmaster.biz/]]> Fri, 24 Sep 2010 18:15:00 +0000 http://forums.designmaster.biz/index.php?showtopic=1011