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Search: Posts Made By: Ko_deZ
Forum: Geothermal & Heat Pumps 07-24-12, 02:02 AM
Replies: 282
Views: 199,452
Posted By Ko_deZ
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...
Forum: Geothermal & Heat Pumps 06-19-12, 02:40 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
Although CO2 is in some situations are much more...

Although CO2 is in some situations are much more efficient than the alternatives, the very high pressure it demands seem to be a reason for people not using it much. 4400 psi is quite a lot, and both...
Forum: Renovations & New Construction 06-11-12, 12:57 PM
Replies: 588
Views: 502,376
Posted By Ko_deZ
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...
Forum: Renovations & New Construction 06-11-12, 04:01 AM
Replies: 588
Views: 502,376
Posted By Ko_deZ
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...
Forum: Renovations & New Construction 04-10-12, 02:40 PM
Replies: 588
Views: 502,376
Posted By Ko_deZ
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...
Forum: Geothermal & Heat Pumps 03-23-12, 10:59 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
No problem AC, I am trying have a look here now...

No problem AC, I am trying have a look here now and again in case of any questions or remarks. Hope you get all the issues dealt with.
Forum: Geothermal & Heat Pumps 03-23-12, 10:45 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
Then Vlad, we are in agreement, larger heat sinks...

Then Vlad, we are in agreement, larger heat sinks is always more efficient than small ones (given the right pressures). I must have misread your earlier posts.
Forum: Geothermal & Heat Pumps 03-23-12, 07:38 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
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...
Forum: Geothermal & Heat Pumps 03-13-12, 04:56 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
Vlad, I think you are mistaking customers to be...

Vlad, I think you are mistaking customers to be properly intelligent and efficiency focused. That is not the case as any marketing person will tell you. A good design and good reputation of...
Forum: Geothermal & Heat Pumps 03-11-12, 08:47 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
I have never used the 1 wire temperature sensors,...

I have never used the 1 wire temperature sensors, so that is the main reason for not choosing those. Yeah, and the fact that I had all of these things around.

If you wish to change to 1 wire...
Forum: Geothermal & Heat Pumps 03-09-12, 02:59 PM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
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...
Forum: Conservation 02-29-12, 08:35 AM
Replies: 575
Views: 1,133,889
Posted By Ko_deZ
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...
Forum: Geothermal & Heat Pumps 02-28-12, 04:11 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
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...
Forum: Geothermal & Heat Pumps 02-27-12, 11:25 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
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...
Forum: Geothermal & Heat Pumps 12-28-11, 05:32 PM
Replies: 282
Views: 199,452
Posted By Ko_deZ
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...
Forum: Conservation 12-28-11, 04:11 AM
Replies: 575
Views: 1,133,889
Posted By Ko_deZ
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...
Forum: Conservation 12-27-11, 03:09 PM
Replies: 575
Views: 1,133,889
Posted By Ko_deZ
This is the one I have, with the front door open:...

This is the one I have, with the front door open:
http://ener.no/filestore/E101600K.pdf

The pipes going out of it is 200mm, so I guess the heat sinks are ca 20cmx20cmx100cm.

The principle is...
Forum: Geothermal & Heat Pumps 12-23-11, 03:03 PM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
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.
...
Forum: Geothermal & Heat Pumps 12-23-11, 02:34 AM
Replies: 1,943
Views: 3,686,231
Posted By Ko_deZ
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...
Forum: Renovations & New Construction 12-23-11, 01:05 AM
Replies: 588
Views: 502,376
Posted By Ko_deZ
Regarding expansion tank, yes, you certainly need...

Regarding expansion tank, yes, you certainly need one. The pressure should be between 1.6 and 2.4 bar in a floor heating system to make help make sure the pump does not cavitate. Also, you must have...
Forum: Conservation 12-05-11, 03:05 PM
Replies: 575
Views: 1,133,889
Posted By Ko_deZ
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...
Forum: Conservation 12-05-11, 02:25 PM
Replies: 575
Views: 1,133,889
Posted By Ko_deZ
I drive past Fagernes on my way to our mountain...

I drive past Fagernes on my way to our mountain cabin. I find our local weather gurus (norwegian metrological institute) better at statistics and displaying it (works outside norway too actually)...
Forum: Conservation 12-05-11, 02:20 PM
Replies: 575
Views: 1,133,889
Posted By Ko_deZ
I did not find any nearby, so I used Oslo. To be...

I did not find any nearby, so I used Oslo. To be more specific, IOSLO5.

Month starting HDD % Estimated
12/1/2010 1507 0
1/1/2011 1174 0
2/1/2011 1211 0.2
3/1/2011 1062 0.8
4/1/2011 538 9...
Forum: Conservation 12-05-11, 03:16 AM
Replies: 575
Views: 1,133,889
Posted By Ko_deZ
No, not passive house, but not too far away. The...

No, not passive house, but not too far away. The U value of my walls is about 0.15W/Km^2, which to my knowledge is the same as a passive house. In Germany a passivhaus makes more senes than here. It...
Forum: Conservation 11-30-11, 04:59 PM
Replies: 575
Views: 1,133,889
Posted By Ko_deZ
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...
Showing results 1 to 25 of 63

 
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