Quote:
Originally Posted by NiHaoMike
Once defrost is over, the heat pump will then have to run a little longer, but it would still be more efficient than using heat strips. You can wire a relay to drop the fan speed to low so the cool air isn't as easy to notice.
There's an electromagnetic defrost heat pump that uses a burst of 915MHz, 800V AC to flash the frost into steam through dielectric heating, which then blows the rest of the frost out of the coils. That is done with a wire routed through the coils, such that it forms a transmission line with the frost as a very lossy dielectric. I don't think there are any production units but there are a few prototypes out there.
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In defrost cycle you STEAL heat from your house and use it for defrost. It is not magic. You cool your inside coil and heat outside. This is why you MUST let cold air flow inside your house, then you reheat it with electric heater or you will get freezing blast.
The second thing is just fantastic it will never work in real world. You just climb on roof and see what is there. You will find real environment including acids dust mice and birds crap plastic bags and more and more. You want to use 800 volt discharge
you will kill somebody there may be even yourself. Many of cool inventions are only good for lab use they will never work. Over 50% of discharge lines on splits have no even insulation You know why? Because birds love it for breakfast
. Another cool idea is to build huge microwave around roof top unit and use it for defrost
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Sorry if it sounds rude. It is just real life on any roof.
