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Forum: Geothermal & Heat Pumps 11-14-14, 12:46 AM
Replies: 37
Views: 11,636
Posted By F357
Yes, I know a lot about CHP. That is not what I...

Yes, I know a lot about CHP. That is not what I am talking about. I have no plans to generate electricity.


I was just asking what is available. Suggestions?



Yeah, I'm pretty familiar...
Forum: Geothermal & Heat Pumps 11-09-14, 05:15 PM
Replies: 37
Views: 11,636
Posted By F357
Except components for such a small system are...

Except components for such a small system are nearly non existent. Compressor heat pump stuff is often available for less than scrap price. Also the ammonia needed is highly poisonous so that doesn't...
Forum: Geothermal & Heat Pumps 11-09-14, 09:34 AM
Replies: 37
Views: 11,636
Posted By F357
Interesting. Is there nothing else available? Car...

Interesting. Is there nothing else available? Car compressors are probably inefficient for a lot of reasons, I would bet mostly just to keep them cheap and light. But what about something more...
Forum: Geothermal & Heat Pumps 11-09-14, 12:23 AM
Replies: 37
Views: 11,636
Posted By F357
Anybody ever build a natural gas heat pump?

So I've been thinking lately...

What if you take an automotive style A/C compressor, and drive it with a natural gas powered engine? Then, capture the waste heat from the engine.

From what I...
Forum: Geothermal & Heat Pumps 11-08-14, 07:10 AM
Replies: 6
Views: 2,774
Posted By F357
The cheap/free units we get on craigslist gotta...

The cheap/free units we get on craigslist gotta come from somewhere. :D
Forum: Geothermal & Heat Pumps 11-06-14, 01:15 AM
Replies: 34
Views: 12,426
Posted By F357
Yeah, I will definitely try to put a reversing...

Yeah, I will definitely try to put a reversing valve in the mix.


My goal here will be to keep my office at roughly the same temp all the time, so I don't have to swing it up and down all the...
Forum: Geothermal & Heat Pumps 11-04-14, 12:44 AM
Replies: 34
Views: 12,426
Posted By F357
Turning a window unit into a mini split?

I have an office I am trying to build an approximately 10k BTU heat pump for. I've been wanting to do a simple backwards air conditioner, but I'm running into more problems than I would like in my...
Forum: Geothermal & Heat Pumps 11-02-14, 07:46 PM
Replies: 31
Views: 9,345
Posted By F357
That's another thing I don't understand about the...

That's another thing I don't understand about the commercial window heat pumps. They often are rated a few thousand BTU less in heating mode. Shouldn't it be the other way around?
Forum: Geothermal & Heat Pumps 11-01-14, 05:01 AM
Replies: 31
Views: 9,345
Posted By F357
Well, to me it all just seems too easy. I must be...

Well, to me it all just seems too easy. I must be missing something. I could go to Walmart and spend $99 on a brand new air conditioner. I could spend another $100 in random parts from ebay, add a...
Forum: Geothermal & Heat Pumps 10-31-14, 04:00 PM
Replies: 31
Views: 9,345
Posted By F357
Oh, I know they make window heat pumps, but they...

Oh, I know they make window heat pumps, but they still don't make sense to me. They all cost something like $600-900+. Not going to save any money paying that much! Mini splits are great too, but if...
Forum: Geothermal & Heat Pumps 10-31-14, 07:46 AM
Replies: 31
Views: 9,345
Posted By F357
Looks like it's definitely an air flow thing. I...

Looks like it's definitely an air flow thing. I pointed a desk fan at the evaporator and it ran for several hours in similar temperatures and never froze up. Still going to hook up a frost sensor......
Forum: Geothermal & Heat Pumps 10-31-14, 12:20 AM
Replies: 11
Views: 3,600
Posted By F357
I'm no expert, but... Yep. I did...

I'm no expert, but...


Yep. I did something very basic like this several years ago with a window unit. Basically pumped pool water over the condenser and caught some of it to go back into the...
Forum: Geothermal & Heat Pumps 10-29-14, 01:57 AM
Replies: 13
Views: 6,226
Posted By F357
Great information. :thumbup:

Great information. :thumbup:
Forum: Geothermal & Heat Pumps 10-29-14, 01:55 AM
Replies: 9
Views: 5,096
Posted By F357
Actually I run it pretty solid through September....

Actually I run it pretty solid through September. Gets spotty about the beginning of October. Even if you just throw the cold away they should make small/portable heat pump pool heaters, like they do...
Forum: Geothermal & Heat Pumps 10-28-14, 05:27 AM
Replies: 9
Views: 5,096
Posted By F357
It would be fantastic if they made a pool heater...

It would be fantastic if they made a pool heater unit also. Here in the NW a swimming pool is barely usable for a month without heat. But the air conditioners all pump heat into the air for 4+ months...
Forum: Geothermal & Heat Pumps 10-26-14, 07:20 PM
Replies: 31
Views: 9,345
Posted By F357
That's what I was thinking. Problem with that is...

That's what I was thinking. Problem with that is when I shut it off, and the ice melts, that rush of water hits the fan and I get some water mist out the hot side. I suppose I need to modify it to...
Forum: Geothermal & Heat Pumps 10-26-14, 02:00 AM
Replies: 31
Views: 9,345
Posted By F357
Reverse air conditioner freeze up problem

I'm experimenting with a 5000 BTU window air conditioner to heat a small work room in my shop. The "outside" part is in the bigger area of my shop where it was 57 degrees. I put the temperature...
Forum: Geothermal & Heat Pumps 10-25-14, 08:25 AM
Replies: 10
Views: 3,982
Posted By F357
That does not mean that an intelligent, non...

That does not mean that an intelligent, non electrician person can not safely and correctly do electrical work, but some electricians will lead you to believe that. The fact is it is perfectly legal,...
Forum: Geothermal & Heat Pumps 10-25-14, 03:08 AM
Replies: 5
Views: 2,181
Posted By F357
I've always wanted to do something like that for...

I've always wanted to do something like that for an A/C system, that way I could take advantage of the time of use power billing option, and only make cold at night when it is cheap...not sure how...
Forum: Geothermal & Heat Pumps 10-24-14, 10:44 PM
Replies: 10
Views: 3,982
Posted By F357
I agree completely. I thought electricians were...

I agree completely. I thought electricians were bad, but HVAC techs are worse. I think that EPA license is granted by god himself to an elite chosen few. :rolleyes:

That's what I love about this...
Forum: Geothermal & Heat Pumps 09-23-14, 04:26 AM
Replies: 22
Views: 4,977
Posted By F357
How about this, where does the heat from the...

How about this, where does the heat from the compressor motor end up going? I never thought about that before, but my 8000BTU unit uses around 800 watts. That's 2700 BTU! Is all (most) of that heat...
Forum: Geothermal & Heat Pumps 09-22-14, 05:12 PM
Replies: 3
Views: 1,570
Posted By F357
Seems like some misinformation here. ...

Seems like some misinformation here.



Even a big diesel generator is lucky to make 12 kilowatts from a gallon of diesel fuel. If diesel cost $6 like they say, that's 50 cents/kilowatt hour.
Forum: Geothermal & Heat Pumps 09-22-14, 04:55 PM
Replies: 22
Views: 4,977
Posted By F357
Would an oversized evaporator help with this?

Would an oversized evaporator help with this?
Forum: Geothermal & Heat Pumps 09-22-14, 12:39 AM
Replies: 22
Views: 4,977
Posted By F357
I read something about purging with nitrogen...

I read something about purging with nitrogen after brazing joints. Is this completely necessary?



I'm going to find a bigger/better A/C unit while they are plentiful. Mine also needs a new fan...
Forum: Geothermal & Heat Pumps 09-21-14, 04:26 AM
Replies: 22
Views: 4,977
Posted By F357
I think I might just end up using the compressor...

I think I might just end up using the compressor on this unit as a vacuum pump, and make a recovery machine for the next unit. Being at the end of summer they are just giving away air conditioners on...
Showing results 1 to 25 of 30

 
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