tag:blogger.com,1999:blog-9240097.post151010352145962791..comments2024-03-28T14:45:49.929-07:00Comments on Revit OpEd: Revit MEP Heating and Cooling Loads ResultsStevehttp://www.blogger.com/profile/14230364057800484763noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-9240097.post-36179439949615585282014-05-30T13:51:59.182-07:002014-05-30T13:51:59.182-07:00So why does the help file state that making change...So why does the help file state that making changes here will only affect an energy analysis and not the H & C load analysis?<br /><br />Straight from help file: "In the Energy Settings dialog, these settings affect the results of a Energy Analysis for Autodesk® Revit® performed using conceptual masses or building elements. <br /><br />Note: These settings do not affect room or space based gbXML export or heating and cooling load calculations and cooling in Revit MEP."n8https://www.blogger.com/profile/01799158672151319437noreply@blogger.comtag:blogger.com,1999:blog-9240097.post-38582740257563604522014-03-11T21:50:09.005-07:002014-03-11T21:50:09.005-07:00After generating the heat and cooling load report ...After generating the heat and cooling load report from revit 2014, i find Cooling Load Density is very low likewise 40(W/m²) as per the building manual calculation, where can correct itAnonymoushttps://www.blogger.com/profile/13023657365089766112noreply@blogger.comtag:blogger.com,1999:blog-9240097.post-3779587727406676482013-03-26T11:32:56.496-07:002013-03-26T11:32:56.496-07:00As mentioned above this is completely reasonable. ...As mentioned above this is completely reasonable. Notice your peak heating load; essentially double with the addition of the outdoor air. This OA value is also very high, standard office is .06 cfm/SF, and does not include an OA per person value. This is why Revit load analysis package is essentially useless for any engineer adhearing to ASHRAE standards. Hogtown Velohttps://www.blogger.com/profile/05524561782401135741noreply@blogger.comtag:blogger.com,1999:blog-9240097.post-49950176027085742102013-03-14T21:36:44.268-07:002013-03-14T21:36:44.268-07:00@ steve : thanks for taking interest in solving ou...@ steve : thanks for taking interest in solving our query.<br />soon we will post details of it here..<br />@ Jordi Xifra there are number of ways to assign parameters to model, so it doesn't matter from which dialog box we have given settings.cooldigzhttps://www.blogger.com/profile/08852396715849261327noreply@blogger.comtag:blogger.com,1999:blog-9240097.post-2085221480864866262013-03-14T05:37:38.741-07:002013-03-14T05:37:38.741-07:00yes this is completely reasonableyes this is completely reasonableAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-9240097.post-7976573086995604512013-03-14T02:15:12.359-07:002013-03-14T02:15:12.359-07:00Hello,
A very good post, thank you for having thi...Hello,<br /><br />A very good post, thank you for having this blog. I just want to ask a question:<br /><br />The second image qeu samples in this post is about "energy settings", I think this dialogue is used to simulate mass energy, while the result given thermal load calculation offers its own dialog to configure the features. I think it's different energy settings to calculate heat loads, you think I'm right?Jordi Xifrahttps://www.blogger.com/profile/09703746549647467800noreply@blogger.comtag:blogger.com,1999:blog-9240097.post-54250224395660470302013-03-13T08:48:49.395-07:002013-03-13T08:48:49.395-07:00Thanks for the input, I thought this might poke yo...Thanks for the input, I thought this might poke you in the eye. :)<br /><br />I guess the flaw in my thinking is to assume that the so called peak is a rigid or fixed place in time and not affected by multiple factors.Stevehttps://www.blogger.com/profile/14230364057800484763noreply@blogger.comtag:blogger.com,1999:blog-9240097.post-57017394341567566582013-03-13T08:45:00.486-07:002013-03-13T08:45:00.486-07:00This is entirely understandable. Depending on the...This is entirely understandable. Depending on the climate, Outside Air can represent a significant - if not the dominant - component of the peak cooling load.<br /><br />Although you didn't show the previous state of the Outside Air settings, I am assuming that they were undefined in this initial state. In that situation, you only have to care about the outside air dry bulb temperature, and the amount of sun per day. So, since the days are longer in June, I'd expect a peak Cooling load to happen then -> The longer time in the sun outweights the lower dry bulb temperature in June vs. August.<br /><br />Once you introduce Outside Air into the equation, you have condition that outside air, and the wet bulb temperature starts to matter a lot. This is because it takes a lot of energy to dehumidify humid outside air.<br /><br />You can see from your image that there is significant difference in wet bulb temperature between June and August. That added component to the overall total cooling load makes August the new peak month -> The increased Outside Air component outweighs the decrease in outside air temperature along with the decrease in total time of Sun hitting the exterior surfaces.<br /><br />So, this is really a situation where you need to understand the energy flows in the building, and how different components influence the total cooling load that is reported.KyleBhttps://www.blogger.com/profile/17147511783897630792noreply@blogger.com