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Anyone seen a phase change unit with an inverter driven compressor? - Page 3

post #21 of 24
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NimbleJack, the main issue with those is that I think they typically use proprietary digital communications between the controller and the inverter for the compressor.
I know there have been products that use an analogue 12vdc signal from the control board to run the inverter, but I'm not sure which manufacturers have, or if they still do.
I don't encounter the small stuff enough to have much experience with it, and it is still relatively uncommon equipment in the US.
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post #22 of 24
When you hadn't mentioned small ductless units I was afraid you were going to say that you hadn't encountered them very much. I surprised they wouldn't be that common though. They get used for spot cooling and additional server room cooling all the time, as much as I am not a huge fan of them, they do get the job done. And they aren't that tough to shoe horn into job sites because you only need the line set between them.

As for the proprietary communication, I can testify to the mitsubishi units using something akin to line voltage between the evap and cond to talk to each other. I'll look into it a bit, I don't know how the micro processor board and compressor communicate, but the thermostat controller communicates differently then normal as well, so it may be more of a headache to play with them not.
post #23 of 24
Quote:
Originally Posted by Gray Mole View Post

Nice biggrin.gif
Good to see someone else in the industry looking at technically advanced ideas.
For the most part you'd never see it in production level units, since the cost outweighs the market.
But a person could make up a prototype in that design. The applications for things like biomedical, CCD and Laser cooling will always be there, and PC cooling is a great place to test it.
The inverter/variable capacity compressors are out there. I did a bit of consulting for a company in the UK that was using them for a chiller system.
Furthering that approach with multiple evaporators and a real electronic metering system is fantastic. Expensive, but fantastic.
I think if you added to the PID a hot gas bypass for each head, you could complete the 'full temperature control' design.
I don't much like the full time approach of HGB in the Cascade units since it can be left running and lead to premature burnout off compressors but in a tightly controlled system it's much safer and could produce (with the ETEVs) a completely controlled temperature system.
New technology like that has been around long enough to come down in price from when it was introduced (though the ETEVs are still right up there) and it really sounds like you could make up a prototype given your experience.
Any chance you can 'appropriate' what you'd need to throw together a working system?
Gray



with some of the stuff you say does make sence. but you will need a extra pump to help with the delivary of the liquid a single compressor will be too be really btig to do the job and very costly. thus getting a second pump in to help with delivary.

but it is very possible.

whay do we not throw in our ideas to do a small prototype??

i am a bit rusty as it has been a while that i worked on refgigeration systems but i still got the know how and knowlage.
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post #24 of 24
Thread Starter 
Quote:
Originally Posted by NimbleJack View Post

When you hadn't mentioned small ductless units I was afraid you were going to say that you hadn't encountered them very much. I surprised they wouldn't be that common though.

Ductless splits are very common for a variety of applications.
It is just the inverter driven ones that, while not new, are still small subset of a small subset of the units I see.
My company rarely installs them because we charge more than most. To much competition on that stuff from the lowballers pricing themselves out of business.

The bane of my existence lately has been the full blown commercial VRV systems. The companies that install them in new buildings typically don't service them, so we have picked up the service of several buildings with them. And at my company, "we" means "me" when it comes to any equipment that has controls that do more than turn compressors and fans all the way on, or all the way off. rolleyes.gif
I haven't come upon one yet that didn't require hours or days of fixing stuff the installers f'ed up because they didn't read, didn't understand, or didn't care about the installation instructions...sozo.gif
Edited by Caleal - 1/24/12 at 10:31pm
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