Dear Marion, So, if I understand, in my case (lack of internal shading), QSOLTR should be bigger than QTSABS because it includes also QTSOUT and radiation that is absorbed by windows but then transferred by convection to outside: QSOLTR=QTSABS+QTSOUT+radiation absorbed by windows and then transferred by convection to outside. If I am right: 1) Way QSOLTR < QTSABS in my case? 2) Solar gain is QTSABS because it represents solar radiation that is captured inside zone while QSOLTR include also QSTOUT and radiation absorbed by windows and then transferred by convection to outside. I would be grateful for more clarification! Kind regards, From: hotline [mailto:hotline@Transsolar.com] Dear Karol, I have to confess that this is a little confusing. For better understanding of the differences of QSOLTR and QTSABS it is important to understand the considered “parts”. QSOLTR is the total shortwave solar radiation transmitted through all external windows including shading device into the airnode. Then in the airnode this radiation is distributed to surfaces (taking into reflection). (For simplicity reasons we assume that there are no adjacent windows). As a results QSOLTR is either a) immediately transferred as convective heat gain to the internal air (= Qsolair, doesn’t exist in Trnsys 17) or is b) absorbed by walls or b) is absorbed by windows (panes, frame and internal shading devices) as radiation leaves (!) the airnode to the outside or c) is transmitted to the outside (= QTSOUT, NType 73) QTSABS (NType 75) consists of
Thus, QSOLTR and QTSABS consider different parts of the solar radiation. I assume you are looking something like QSOLTR – QTSOUT. I hope this explanation helps. Kind regards, Marion Von: Karol Bandurski <karol.bandurski@put.poznan.pl> Dear Christoph, Thank you for your response! The problem is that, it seems to me, that I don’t have internal shading, so QSOLTR should equal QTSABS. Am I right? How should I set window type and external devices to get QSOLTR=QTSABS? Kind regards, From: hotline [mailto:hotline@Transsolar.com] Dear Karol, QSOLTR is the total shortwave solar radiation transmitted through external windows and internal shading. QTSABS also includes the secondary heat flux which includes the convection of internal shader. Hope that clarifies your energy balance a bit. Best, Christoph Von: TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org> Im Auftrag von Karol Bandurski via TRNSYS-users Dear All, I am going to find whole solar gain which come to zone throug windows. There are two outputs that I consider: QTSABS and QSOLTR. It seems to me that bigger should be QSOLTR, because it is shortwave radiation transmitted through window (but not kept 100% in air node). The QTSABS is what exactly has been kept - has been absorbed by inside surfaces. But it is appear that QTSABS > QSOLTR… Could you write me what is right interpretation of those outputs? Kind regards, -------------------------------------------------------------------- Karol BANDURSKI M. Sc. Faculty of Civil and Environemntal Engeneering Division of Heating, Air Conditioning and Air Protection Poznan University of Technology https://www.researchgate.net/profile/Karol_Bandurski www.put.poznan.pl/~karol.bandurski |