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Search took 0.00 seconds. Search: Posts Made By: Mikesolar
Forum: Geothermal & Heat Pumps 12-17-13, 12:05 PM
Replies: 45
Views: 25,870
Posted By Mikesolar
Xringer, What is the lowest outdoor temp you have...

Xringer, What is the lowest outdoor temp you have measured and what kind of performance have you seen with your HPs?
Forum: Geothermal & Heat Pumps 11-26-12, 05:35 AM
Replies: 45
Views: 25,870
Posted By Mikesolar
If you are stripping the aluminum off the coil, I...

If you are stripping the aluminum off the coil, I hope you counted the fins and approximate surface area because somehow you will have to make up surface area in another way, perhaps a liquid jacket...
Forum: Geothermal & Heat Pumps 11-26-12, 05:32 AM
Replies: 45
Views: 25,870
Posted By Mikesolar
I've used the Ranco before and done many things...

I've used the Ranco before and done many things to adapt defrost mechanisms to different machines and it is still a pain IF the goal is the lowest cost overall heating (best COP). One problem with...
Forum: Geothermal & Heat Pumps 11-25-12, 06:18 PM
Replies: 45
Views: 25,870
Posted By Mikesolar
The question for all makers of ASHPs is how do...

The question for all makers of ASHPs is how do you best defrost for the shortest amount of time without taking heat from the conditioned space. Most older traditional HPs would have a relay that...
Forum: Geothermal & Heat Pumps 11-25-12, 11:02 AM
Replies: 45
Views: 25,870
Posted By Mikesolar
The heating element will be the cheapest method...

The heating element will be the cheapest method but it really sucks the power to use straight electricity to defrost when there is hot gas available at a lower energy penalty.
Forum: Geothermal & Heat Pumps 11-25-12, 06:17 AM
Replies: 45
Views: 25,870
Posted By Mikesolar
Adam, What you need is a reversing valve or...

Adam,
What you need is a reversing valve or easier still, a hot gas bypass defrost system. Basically, all it does is take the hot gasses straight out of the condenser and puts it directly into evap...
Forum: Geothermal & Heat Pumps 10-20-12, 06:28 AM
Replies: 45
Views: 25,870
Posted By Mikesolar
The Sanyo is definitely in the open, where my...

The Sanyo is definitely in the open, where my coil is entirely within a cabinet and only subject to reflected light, if at all. I think the tuning can be made to avoid it but it needs to be quite...
Forum: Geothermal & Heat Pumps 10-20-12, 06:23 AM
Replies: 45
Views: 25,870
Posted By Mikesolar
Often the sensor is placed at the "air on"...

Often the sensor is placed at the "air on" position as this is where the coldest refrigerant will be and frost starts there and if the two halves of the unit sense the full width of the fin, (from...
Forum: Geothermal & Heat Pumps 10-19-12, 08:15 PM
Replies: 45
Views: 25,870
Posted By Mikesolar
I was wondering whether a system like this...

I was wondering whether a system like this coupled with something that measures the exact distance between two fins, which would have to be precise, and compare the distance with frost/no frost on...
Forum: Geothermal & Heat Pumps 10-19-12, 06:17 PM
Replies: 45
Views: 25,870
Posted By Mikesolar
It will have to be tested in real time under many...

It will have to be tested in real time under many types of snow, rain, sleet etc. I would be interested in putting it in the next HP I make but that is a few months away.
Forum: Geothermal & Heat Pumps 09-29-12, 10:45 AM
Replies: 45
Views: 25,870
Posted By Mikesolar
That looks cool. I will have to look into it...

That looks cool. I will have to look into it further. All ASHPs have the same problem of working down to -15C or so although there is not much moisture in the air at that temp.

What is the spacing...
Forum: Geothermal & Heat Pumps 09-29-12, 08:16 AM
Replies: 45
Views: 25,870
Posted By Mikesolar
Your best bet would be to use 2 thermisters, one...

Your best bet would be to use 2 thermisters, one for the ambient temp (air on) ad one on the fins (at the air on location). Remember that your liquid line is going to be X deg colder than ambient so...
Showing results 1 to 12 of 12

 
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