Chris Wilson Posted June 22, 2007 Share Posted June 22, 2007 Looking for a cheapish (used is fine) split unit A/C system to cool a large room of about 4200 cubic feet. Probably at least 30,000 BTU cooling needed? Will I find something on Ebay? Doesn't have to look state of the art or even pretty, just be capable of cooling a large room down to maybe 50 degrees F in the hottest of UK weather with several incubators throwing out heat into the room with no windows open. Thanks Quote Link to comment Share on other sites More sharing options...
JustGav Posted June 22, 2007 Share Posted June 22, 2007 Chris, if you remind me tomorrow, I'll dig out all my spreadsheets from what I've done for data centre computer rooms, as I've had to do a few small communications rooms which only required around 3kw worth of cooling, and I'll do some figures and work out a size for you roughly. Gav Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 22, 2007 Author Share Posted June 22, 2007 Thanks Gav, I never cease to be amazed at the breadth of knowledge in here, it's rare someone asks a techie question that someone can't answer with accuracy and aplomb Quote Link to comment Share on other sites More sharing options...
JustGav Posted June 23, 2007 Share Posted June 23, 2007 Okay, done some initial calcs... Assuming your 4200 cubic feet... I've made a guess at the following.. Room Length : 10metres (32.8084ft) Room Breadth : 5metres ( 16.4042ft) Room Height : 2.45metres (8.038058) Giving a total of 4326.047 cubic feet The total BTU's for the room would be 16850... However this does not include the lighting or the heating equipment. If you can provide those BTU's I can calculate the next bit. Thanks Quote Link to comment Share on other sites More sharing options...
Guest Blata Posted June 23, 2007 Share Posted June 23, 2007 I cannot argue with the figures but to acheive 50 f on a domestic unit is nigh on impossible it would require a low temp application . however temps of 62f upwards could be acheived. Long technical expalnation could be given Quote Link to comment Share on other sites More sharing options...
JustGav Posted June 23, 2007 Share Posted June 23, 2007 I cannot argue with the figures but to acheive 50 f on a domestic unit is nigh on impossible it would require a low temp application . however temps of 62f upwards could be acheived. Long technical expalnation could be given This is true... I'm just doing the initial figures, to see what it works out to be, from there I'm sure we can see if there are any low-end units that would do it. I'd be more worried about the duty cycle on the 'home' style units being up to the job. Quote Link to comment Share on other sites More sharing options...
JustGav Posted June 23, 2007 Share Posted June 23, 2007 Okay, just double checked something... 50f is only 10oC isn't it?? As you can see from my spreadsheet I don't work in imperial... As Blata says 10oC will be tough... Quote Link to comment Share on other sites More sharing options...
Guest Blata Posted June 23, 2007 Share Posted June 23, 2007 Yep 10c is tough on domestic almost looking at a cold room application, what sort of budget do you have in mind and is 50 f what you are looking for? Quote Link to comment Share on other sites More sharing options...
Guest Geneb Posted June 23, 2007 Share Posted June 23, 2007 Blata should know his stuff lol its what he does for a living hehe Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 25, 2007 Author Share Posted June 25, 2007 Typo alert, I meant 40 to 50 degrees C, of course, not Fahrenheit... Not tyrying to store a side of beef in there.... If you assume that the incubators give off between 1 and 3 Kw of heat, depending on how many are on, and the room receives sunlight through 2 fairly big double galazed windows, one adjoing a conservatory that gets *loody hot on a summers day, is that accurate enough to give a guide? I want the room to be cool enough to leave a dog in without it feeling uncomforatbe, with no windows open. Doable without anything too trick or expnsive. Quote Link to comment Share on other sites More sharing options...
lust2luv Posted June 25, 2007 Share Posted June 25, 2007 40-50C? Are you trying to cook said dog? Quote Link to comment Share on other sites More sharing options...
AndyT Posted June 25, 2007 Share Posted June 25, 2007 You need something for 60 Fahrenheit Chris - 15.6 degrees Celsius. Pooch won't be happy with you otherwise. Quote Link to comment Share on other sites More sharing options...
Havard Posted June 25, 2007 Share Posted June 25, 2007 40-50C? Are you trying to cook said dog? I do like a hot dog occasionally though!! http://img513.imageshack.us/img513/1171/funnyphoto034fe2.jpg H. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 25, 2007 Author Share Posted June 25, 2007 Sorry, I am losing the plot today, trying to bale out the workshop, get to the doctors for the wifes medicine, and finish someones Supra, as well as wondering if wallabies can swim I mean hold the room at a cool comfortable temeprature for a dog to be in That's safest, rather than try and work out an actual temperature Thanks guys. Quote Link to comment Share on other sites More sharing options...
Guest IainS Posted June 25, 2007 Share Posted June 25, 2007 Hi everybody, I'm pretty new to the forum...but know a bit about this myself...CIBSE B guide recommends 12-18degC for dogs and (interestingly) suggests that male dogs have a total heat gain of 26W and female dogs 22W when resting! Quote Link to comment Share on other sites More sharing options...
JustGav Posted June 26, 2007 Share Posted June 26, 2007 Something like 18oC would be easy enough to maintain, as it is usual at the low end of the scale of commercially available units. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 26, 2007 Author Share Posted June 26, 2007 So what sort of spec do I need to look for, if i find any used units? how are they rated, and is there jiggery pokery in ratings to be aware of, as in, for example, audio amps, and RMS, peak to peak, et cetera? Thanks everyone. Quote Link to comment Share on other sites More sharing options...
Pete Posted June 28, 2007 Share Posted June 28, 2007 The above sounds way over complicated to me for the task. First thing I'd do is set yourself a budget - unit prices vary a lot in price and reliability. They cost LOTS in electricity to run, you're better off getting an inverter unit as they're cheaper in the long run to run. (Varies cooling output rather than just on/off) As an example we've just bought some LG P05 units (http://uk.lge.com/proddivergent.do?actType=search&categoryId=0806&modelCategoryId=&parentId=08&category_level=) at about £4k fitted ea. unit. They're classed as consumer units Quote Link to comment Share on other sites More sharing options...
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