Just for the heck of it today I write a dymanic model of a greenhouse, incorporating incoming solar radiation as it varies throughout a typical day, for each day of the year, looking at the inclintaion of the sun and incoming radiation throughout the day. Coupled with some basic heat transfer coefficients for a greenhouse and a bit of tuning to match real data its started to look fairly realistic compared to both my greenhouse and conservatory.
Couple of things to add in to make it more realistic, i need a monte carlo generator to simulate the correct number of random cloudy hours/years (although this year it seems to be all the time). I also need to incorporate the effect of autovents at the hotter periods.
Apart from that its proving quite 'interesting' i use the word with caution, lol. It certainly helps to understand in quantitive terms the effect of thermal lag over the course of a year and how much benefit it is in monetary value.
Next step is perhaps to use it to calculate the the optimum level of insulation/thermal lag to give the minimum life time cost.
So what is the point of all this you may ask, probably none at all except I find the excersise interesting.
Im also thinking of getting a new 16ft greenhouse so playing with the insulation values may be interesting.
Heres the difference between 50kg of water and 250kg of water on a small greenhouse! It is however overly simplified because it assumes the water is allways at the same temperature as the air in the greehouse, which becomes harder and harder to achieve the more water you have!
Next semester im going to learn programming for my meteorology. I suppose we are going to write some simple weather models but it is interesting.
If you know the maths the programming part is not so hard. The problem with a lot of young engineers using simulators these days is they actually believe the results of simulations withought understanding how bug ridden most of those simulations actually are...
No idea what arcgis is but In my area which is chemical engineering most of the software is fundamentally unreliable and most young engineers have lost the ability to use pen and paper and check the results. I imagine its the same everwhere as the software is continuously dumbed down to increase sales.
plantguyty1: I'm looking for pollen.
Dec 31, 2016 23:50:46 GMT 7
fredp: I'm trying to add a PDF file to a new thread but it doesn't seem to work thru the "Add Attachment" button. Can someone help?
Jan 8, 2017 0:08:27 GMT 7
plantguyty1: Does anybody need pollen? I have N. Miranda it's the first time it flowered for me so I do not know if its sterile or a good candidate. Is there anybody with an active female that would like to give my pollen a shot?
Feb 19, 2017 1:19:37 GMT 7
siravi: im looking for seeds, anyone?
Mar 15, 2017 13:41:04 GMT 7
samu0945: I'm looking for N. Aristolochioides
Apr 2, 2017 8:48:30 GMT 7
thatoneplantboi: Hey guys, I'm new to growing nepenthes, I'm getting a mini indoor greenhouse to grow them in. What kind of light should I use for them? Also, if you could provide a link to a product, it would be very much appreciated
Oct 5, 2017 10:16:29 GMT 7
borneo: Yes, they work superbly. But you don't need expensive lights, cheap ones work well too.
Sept 2, 2018 14:34:57 GMT 7
mylesg: i havent checked in here for a while, why does it seem all the CP forums have lost their once strong activity? the trade/sale section used to be so active and now its a ghost town. where is everybody hanging out these days for a strong online CP community?
Dec 9, 2018 3:15:01 GMT 7
mylesg: Happy holidays to everyone out there!
Dec 26, 2018 0:23:13 GMT 7
lance: Everyone left the forums and moved to facebook groups.
Oct 2, 2019 12:09:05 GMT 7
mylesg: yes, facebook groups will never have same feel as this place once did
Nov 3, 2019 8:34:22 GMT 7
etiennecancio: perhaps we can try to revitalize the old forums? i always found them to be much more convenient than facebook groups at least hah
Nov 4, 2019 17:01:25 GMT 7
mylesg: i refuse to abandon this place, i am posting in my grow thread with many photos and always there to answer any questions just built new grow room and tons of pitcher shots!
Nov 6, 2019 21:17:59 GMT 7