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Search: Posts Made By: dhaslam
Forum: Solar Heating 09-13-17, 08:08 PM
Replies: 10
Views: 9,621
Posted By dhaslam
I have a fairly similar size system. There are...

I have a fairly similar size system. There are 90 tubes plus three flat plate panels. There is a separate system with sixty tubes for hot water. My system heats an overground clay store with...
Forum: Solar Heating 07-01-14, 06:28 AM
Replies: 11
Views: 10,041
Posted By dhaslam
It is safer to use anti freeze. Heat pumps...

It is safer to use anti freeze. Heat pumps usually sense input temperature and cut out at around freezing but at that stage the return water will be below zero. It can happen if there is flow...
Forum: Solar Heating 06-30-14, 09:35 AM
Replies: 11
Views: 10,041
Posted By dhaslam
A compromise could be to just insulate the top of...

A compromise could be to just insulate the top of the tank. It isn't very easy to insulate the bottom anyway because moisture in the ground will accelerate cooling. The top of the store needs to...
Forum: Geothermal & Heat Pumps 03-14-14, 12:29 PM
Replies: 293
Views: 105,098
Posted By dhaslam
It looks like 2 x parallel loops of 250' of 3/4"...

It looks like 2 x parallel loops of 250' of 3/4" pex,

with flow of 3.65 gpm in each loop
at Delta T of 20* F , (tank vs. water inside pex)
should transfer about 15 Tons of heat = 180K btus
At...
Forum: Geothermal & Heat Pumps 03-13-14, 03:52 PM
Replies: 293
Views: 105,098
Posted By dhaslam
That doesn't sound right. I use a calculation of...

That doesn't sound right. I use a calculation of about 6 watts per metre which would be about 7 watts per foot pipe run. I have 1/2 mile of pipe for a 2500 sq' bungalow. Of course being...
Forum: Geothermal & Heat Pumps 03-13-14, 09:44 AM
Replies: 293
Views: 105,098
Posted By dhaslam
If the input water is hot enough it should be...

If the input water is hot enough it should be diverted into the heating circuit and bypass the heat pump. At intermediate temperatures the input temperature can be regulated by mixing the...
Forum: Geothermal & Heat Pumps 03-08-14, 01:18 PM
Replies: 293
Views: 105,098
Posted By dhaslam
The usual input temperature limit for a GSHP is...

The usual input temperature limit for a GSHP is 20C/68F The one I have only allows 15C maximum. The problem is that the compressor can overheat, it needs the cool water input to keep it...
Forum: Geothermal & Heat Pumps 03-07-14, 07:14 PM
Replies: 293
Views: 105,098
Posted By dhaslam
Yes I understand about the problem of...

Yes I understand about the problem of overheating the soil underneath the house. Overheating isn't so much of an issue here because we are about 15 degrees farther north so the sun isn't so hot...
Forum: Geothermal & Heat Pumps 03-07-14, 12:25 PM
Replies: 293
Views: 105,098
Posted By dhaslam
The mound is round and about eight metres...

The mound is round and about eight metres across. Originally the heating source was to be hot air supplied by home made coroplast collectors so there were large land drainage pipes for...
Forum: Geothermal & Heat Pumps 03-07-14, 10:46 AM
Replies: 293
Views: 105,098
Posted By dhaslam
I had a fairly similar situation in Ireland. The...

I had a fairly similar situation in Ireland. The ground is layered limestone rock and not practical for a ground loop. After some experimentation I have ended up with an overground heat store ...
Forum: Geothermal & Heat Pumps 11-01-12, 06:32 AM
Replies: 16
Views: 9,316
Posted By dhaslam
There is no point in applying heat to an...

There is no point in applying heat to an underground loop. One good days rain will take all the stored heat away. I have a clay filled seasonal store that starts about one metre below...
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