[esp-r] Re: Res output, what, exactly, is given?

[paul strachan]

Hi Achim,

The "solar entering" is the amount entering the zone - it does not 
include any solar radiation absorbed in the glazing as it enters the 
zone, and it does not include any reduction for solar radiation leaving 
the zone. The solar radiation in the monthly gains/losses table 
corresponds with data you can get from the "solar processes" choice 
(e.g. if you get the mean value of "solar entering" from the solar 
processes table and multiply by the number of hours in the month, it 
agrees with the monthly gain - at least for the tests I did).

The "cooling load" can be greater than the "solar entering" (even when 
there are no internal gains) because of the additional load caused by 
solar radiation absorbed in the glazing and transferred by radiation and 
convection into the zone.

The "solar absorbed" in the zone should always be less than the the 
"solar entering" the zone.

Regards
Paul

Geissler Achim wrote:
>
> Hi everybody,
>
> is there anybody out there, that can tell me what, exactly, the output 
> is for
>
> res
>
> (d) enquire about
>
> (l) monthly gains & losses
>
> ¦ Solar radiation ¦
>
> ¦ Absorb ¦ entering ¦
>
> ¦ Inside ¦ zone ¦
>
> ?
>
> I would assume that “absorb inside” is the solar radiation (direct and 
> diffuse) absorbed by all surfaces that receive short wave radiation 
> and “entering zone” is short wave radiation entering (direct and 
> diffuse) minus direct reflected short wave radiation back out again. 
> Is this correct?
>
> However, I am not quite sure about this. I would have expected that 
> cooling load reduction and solar entering zone reduction when 
> introducing a shading obstruction would be similar (as we have no 
> internal loads and no ventilation, control to constant air 
> temperature, solar radiation is the main gain). This is not the case 
> in our model (reduction of solar entering by approx. 15 - 20 %, 
> reduction of cooling load by approx. 30 %). Strange, I think.
>
> Also, interestingly, for a south oriented zone, the “absorb inside” is 
> mostly larger than “entering zone”, for a west oriented zone, both 
> values are more or less equal … can that have something to do with 
> incidence angles, the direct-to-diffuse ratio and reflection out again?
>
> By the way, ESRU, in above mentioned output there seems to be a small 
> bug, the “Annual” line (last line of output table) seems to be too 
> short, as the last one or two annual sums are not printed (to screen, 
> at least).
>
> Thanks for any ideas.
>
> Best regards,
>
> Achim Geissler
>