make your recommendation

[Lc_shi]

Hi sirs
I've been seeking new developed good quality and price products in HVAC field . Would you pls make your recommendation?

thanks

regards
LC

[Peter_1]

What excatly do you mean Lc?
Standard equipment like tools, handtools or machines like compressors, evaporators, ... :confused:

[Lc_shi]

Sorry to make an unclear question.
I mean new air conditioning and refrigeration product or component not including tools. For example, a new kind of heat pump /heat exchanger etc.
Hope it make clear.

regards
LC

[BigJon3475]

It's not really new but the cost priced it out of the normal persons price range up until recently. It's still fairly expensive but better priced than in the past here in the US...

http://www.gotohallowell.com/

The all climate heatpump.

[Peter_1]

Read their technical paper
http://www.gotohallowell.com/assets/DS_White_PaperLR.pdf

I don't understand why they're switching on their 2 internal compressors when outside temperature drops to increase max BTU.
If outside temperature drops and you switch on your 2nd compressor, then evapoarting pressure will even drop very fast further down and coil will freeze up faster.
The DT across the coil increases (larger capacity) but the COP drops very fast when evaporating pressure drops.

It's not because you increase pumped volume that capacity will increase. You can only pump what coil extracts.

So, I don't follow them very well. Am I missing something?

[Peter_1]

Further on my comment, if you use the ambient as a heat source... I have great doubts.

[BigJon3475]

To be honest I have never worked on one or seen one. It was just brought up in another forum I go to as something "new" So I can't really speak very intelligently on it :o.


I did find this article while chatting about it in the other place:

http://archrecord.construction.com/resources/conteduc/archives/0603edit-1.asp


It was tried out by a university and so far they seem to have good results. Most of this systems seem to be in Canada so far and are just starting to try and branch out in the US. I will keep looking into it more and see if I can add something more useful.

[Peter_1]

Perhaps a litlle off topic but I think Lc is interested in the whole explanation of this Heatpump.
Here is the link to the pdf file http://www.megaupload.com/nl/?d=LUN133MF

[Peter_1]

Already tried this Google feature ?
http://www.google.com/patents?as_q=heat+pump&num=10&btnG=Google+Search&as_epq=&as_oq=ground&as_eq=&as_pnum=&as_vt=&as_pinvent=&as_pasgnee=&as_pusc=&as_pintlc=&as_drrb_is=b&as_minm_is=1&as_miny_is=2000&as_maxm_is=1&as_maxy_is=2007&as_drrb_ap=q&as_minm_ap=1&as_miny_ap=2007&as_maxm_ap=1&as_maxy_ap=2007

[Peter_1]

http://www.google.com/patents?id=ol2AAAAAEBAJ&dq=%22heat+pump%22+ground&as_drrb_is=b&as_minm_is=1&as_miny_is=2007&as_maxm_is=10&as_maxy_is=2007

[Peter_1]

http://www.sunmachine.de/download/prospekte/sunmachine_2006_pellets.pdf
Not direct refrigeration related but heating and power generation with wood pellets vai a stirling engine.
Nice piece of mechanic.
Some movies and flash movies http://www.tibri.be/psm2.php

[Lc_shi]

very good information!
thanks.

regards
LC