Forum: Geothermal & Heat Pumps
07-24-12, 02:02 AM
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Replies: 282
Views: 283,739
Just so the question has been asked. Did you...
Just so the question has been asked. Did you change the oil in the compressor? If I remember correctly, propane needs mineral oil, while R410a needs to run on a special synthetic oil. Getting that...
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Forum: Geothermal & Heat Pumps
06-19-12, 02:40 AM
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Replies: 1,943
Views: 6,535,996
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Forum: Renovations & New Construction
06-11-12, 12:57 PM
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Replies: 588
Views: 762,888
Constand decay rate is not a real world...
Constand decay rate is not a real world situation, is it? Using dt/L and claiming it to be real world example would demand that the material surrounding the pipe drops in temperature exactly like the...
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Forum: Renovations & New Construction
06-11-12, 04:01 AM
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Replies: 588
Views: 762,888
You twisted yourself out of that quite well...
You twisted yourself out of that quite well Robert, but I am not convinced. I think this is a simplified illustration, not a simulation(?). If it is a simulation, the the parameters you have used is...
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Forum: Renovations & New Construction
04-10-12, 02:40 PM
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Replies: 588
Views: 762,888
Hi AC.
Thicker alu means longer distance...
Hi AC.
Thicker alu means longer distance between pex pipes. Higher alu-cost, lower pex cost. I suggest cc 200mm with about 17mm pex, and maximum 80m long circuits. Just divide in several circuits...
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Forum: Geothermal & Heat Pumps
03-23-12, 10:59 AM
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Replies: 1,943
Views: 6,535,996
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Forum: Geothermal & Heat Pumps
03-23-12, 10:45 AM
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Replies: 1,943
Views: 6,535,996
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Forum: Geothermal & Heat Pumps
03-23-12, 07:38 AM
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Replies: 1,943
Views: 6,535,996
True, but that would be screwing up your...
True, but that would be screwing up your reputation. I was talking about the loads of companies that has a good reputation, and keeps it by delivering good quality systems. They do consider...
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Forum: Geothermal & Heat Pumps
03-13-12, 04:56 AM
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Replies: 1,943
Views: 6,535,996
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Forum: Geothermal & Heat Pumps
03-11-12, 08:47 AM
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Replies: 1,943
Views: 6,535,996
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Forum: Geothermal & Heat Pumps
03-09-12, 02:59 PM
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Replies: 1,943
Views: 6,535,996
Arduino code
Hi all
Sorry for the wait. I have only had an hour today, so I did not get to make it very nice or anything, but this should work. Tell me what you want in addition to this. If you do understand a...
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Forum: Conservation
02-29-12, 08:35 AM
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Replies: 575
Views: 1,419,172
As we have very cold winters here, I have a...
As we have very cold winters here, I have a little insight. With a proper set up ventilation system in Norway, there is a slight negative pressure. The reason is logical when I tell you now =)
If...
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Forum: Geothermal & Heat Pumps
02-28-12, 04:11 AM
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Replies: 1,943
Views: 6,535,996
AC, that should be easy enough to do. Sparkfun...
AC, that should be easy enough to do. Sparkfun carries some current measurement devices, but what kind of pressure sensors would you use? Any other ideas?
Regarding SSR and electro-mechanical. The...
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Forum: Geothermal & Heat Pumps
02-27-12, 11:25 AM
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Replies: 1,943
Views: 6,535,996
Hi guys.
I have been very busy for a long...
Hi guys.
I have been very busy for a long time now. Regarding Arduino stuff, I said earlier that I could help out if someone needed it. I have yet to receive any questions, but still AC said that...
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Forum: Geothermal & Heat Pumps
12-28-11, 05:32 PM
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Replies: 282
Views: 283,739
CO2 can be used, but only in high thermal...
CO2 can be used, but only in high thermal difference sites, the return temperature on the high side must be quite low. It will be working without phase shift, but can then give COP of 10 or above in...
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Forum: Conservation
12-28-11, 04:11 AM
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Replies: 575
Views: 1,419,172
Hi.
There is a false back. That is how the...
Hi.
There is a false back. That is how the airflow gets where it is supposed to. The doors have rubber gaskets on them ensuring an airtight seal. They might be as much as 30cm deep though. Cannot...
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Forum: Conservation
12-27-11, 03:09 PM
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Replies: 575
Views: 1,419,172
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Forum: Geothermal & Heat Pumps
12-23-11, 03:03 PM
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Replies: 1,943
Views: 6,535,996
Got the last pieces I need today, so not yet....
Got the last pieces I need today, so not yet. Currently running with a hot water heater. It is cold, but just around freezing, not like last year, when we had 20C below (40F?) for a month already.
...
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Forum: Geothermal & Heat Pumps
12-23-11, 02:34 AM
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Replies: 1,943
Views: 6,535,996
You are quite right. Parallel is better. The...
You are quite right. Parallel is better. The reason is simply that you avoid having possibly a full HX freeze up. The first one will always be colder than the second one. This is the same problem as...
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Forum: Renovations & New Construction
12-23-11, 01:05 AM
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Replies: 588
Views: 762,888
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Forum: Conservation
12-05-11, 03:05 PM
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Replies: 575
Views: 1,419,172
Just a couple of questions. was it 18,50C or...
Just a couple of questions. was it 18,50C or 19,49C indoors? What about return temperature? 16,50 or 17,49? If we take the most extreme cases, the best one gives ( 100 * ( 17,49 + 13 ) / ( 18,50 + 13...
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Forum: Conservation
12-05-11, 02:25 PM
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Replies: 575
Views: 1,419,172
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Forum: Conservation
12-05-11, 02:20 PM
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Replies: 575
Views: 1,419,172
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Forum: Conservation
12-05-11, 03:16 AM
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Replies: 575
Views: 1,419,172
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Forum: Conservation
11-30-11, 04:59 PM
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Replies: 575
Views: 1,419,172
I suggest increase fan speed, or decrease fan...
I suggest increase fan speed, or decrease fan speed to keep them both stable. Say 1% fan speed per 1% RH, and something similar for CO2. Then you use the highest of the two. I also suggest adding a...
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