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Search: Posts Made By: dhaslam
Forum: Solar Heating 09-13-17, 08:08 PM
Replies: 10
Views: 4,781
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: Product Reviews 02-17-17, 09:53 AM
Replies: 25
Views: 7,708
Posted By dhaslam
In Europe TVs did not have an energy rating until...

In Europe TVs did not have an energy rating until 2010. Any most large TVs before that make good room heaters. I noticed my TV bought in 2008 was able to raise the room temperature by one degree...
Forum: Geothermal & Heat Pumps 09-17-15, 10:25 AM
Replies: 8
Views: 2,235
Posted By dhaslam
When you reach a fairly large size of heat pump ...

When you reach a fairly large size of heat pump you should also consider having two smaller ones. They are fairly reliable but repairs can be a problem. You also would have the option of...
Forum: Geothermal & Heat Pumps 09-17-15, 04:58 AM
Replies: 21
Views: 5,957
Posted By dhaslam
The heat from waste water goes mainly into the ...

The heat from waste water goes mainly into the pipework close to the house and in cold climates it prevents freezing.

For water heating the best choice is evacuated tubes even in countries ...
Forum: Geothermal & Heat Pumps 09-15-15, 05:05 AM
Replies: 18
Views: 4,001
Posted By dhaslam
It is very easy to make a seasonal heat store on...

It is very easy to make a seasonal heat store on the side of a steep hill. You can cut out a section of the hill, insert insulation, water protection and heat exchange pipes and refill it. ...
Forum: Geothermal & Heat Pumps 09-09-15, 07:21 AM
Replies: 218
Views: 51,164
Posted By dhaslam
I think that WyrTwister has a fair point about...

I think that WyrTwister has a fair point about transferring water. The normal GSHP setup using a ground array and heat exchanger has two inefficiencies compared to DX. There is something like...
Forum: Geothermal & Heat Pumps 08-16-14, 07:04 PM
Replies: 29
Views: 5,625
Posted By dhaslam
Depending on air for a heat source is always...

Depending on air for a heat source is always going to be a problem in cold weather. Drilling in deep rock for geothermal is supposed to be easier because the sides don't have to be lined. ...
Forum: Geothermal & Heat Pumps 08-15-14, 07:37 PM
Replies: 29
Views: 5,625
Posted By dhaslam
Although it would be fairly expensive you could...

Although it would be fairly expensive you could add a buffer tank to store heat that can supplement the output at selected times. Heat input is more efficient during the day and usually heat...
Forum: Solar Heating 07-01-14, 06:28 AM
Replies: 11
Views: 4,988
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: 4,988
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 06-21-14, 08:51 PM
Replies: 18
Views: 7,391
Posted By dhaslam
It is interesting to hear of someone else ...

It is interesting to hear of someone else attempting to use seasonal heat storage. It should be the main way to heat buildings in winter and would be relatively easy to do on a big scale for ...
Forum: Geothermal & Heat Pumps 03-14-14, 12:29 PM
Replies: 293
Views: 48,075
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: 48,075
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: 48,075
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: 48,075
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: 48,075
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: 48,075
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: 48,075
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 11-03-12, 10:50 AM
Replies: 16
Views: 4,934
Posted By dhaslam
The Canadian site seems to be quite dry. There...

The Canadian site seems to be quite dry. There is about one half metre of precipitation in the year and about one third of that is snow. The boreholes are in a circle about 35 metres across ...
Forum: Geothermal & Heat Pumps 11-01-12, 11:48 AM
Replies: 16
Views: 4,934
Posted By dhaslam
Very impressed with your efforts with home made...

Very impressed with your efforts with home made heat pump etc.

I am hoping to have an old air to water heat pump modified professionally to boost the temperature of the water coming from the...
Forum: Geothermal & Heat Pumps 11-01-12, 06:32 AM
Replies: 16
Views: 4,934
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...
Showing results 1 to 21 of 21

 
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