Re: [EVDL] Mitsubishi air source heat pumps

2021-03-23 Thread Jay Summet via EV
On 3/23/21 12:11 PM, Willie via EV wrote: I have the unconfirmed impression that the "hyper heat" heat pumps are better at low temperature heat production than the resistive heat add ons. Heat pumps are almost always more efficient that a restive heat element. However, when the

Re: [EVDL] Mitsubishi air source heat pumps

2021-03-23 Thread Willie via EV
Thanks for the VERY informative information! "Hyper heat" seems to have become a common label applied to air source heat pumps that can produce heat down around zero F; other brands than Mitsubishi offer them. I have the unconfirmed impression that the "hyper heat" heat pumps are better at

Re: [EVDL] Mitsubishi air source heat pumps

2021-03-23 Thread Jay Summet via EV
On 3/22/21 12:33 PM, Willie via EV wrote: Someone asked for link: https://www.mitsubishicomfort.com/benefits/hyper-heating There has to be a catch.  How can they efficiently extract heat from such cold air?  I'm eager to learn details and see evaluations. Here is one explanation:

Re: [EVDL] Mitsubishi air source heat pumps

2021-03-22 Thread Lee Hart via EV
John Lussmyer via EV wrote: Just depends on the system involved. 0F is WAY above absolute 0. It's quite possible to make a heatpump that works with a large temperature difference. It's not going to get a 20x factor like most, but I'm quite sure that you can make one that is > 1. Bingo! :-) I

Re: [EVDL] Mitsubishi air source heat pumps

2021-03-22 Thread John Lussmyer via EV
On Mon Mar 22 16:57:39 PDT 2021 ev@lists.evdl.org said: >They can't, I don't care what they say. The laws of physics still apply. >The "heat" that is being discharged might be 60F which is hot compared >to 0F. They would have to circulate thousands of cubic yards of 0F air >to obtain even a tiny

Re: [EVDL] Mitsubishi air source heat pumps

2021-03-22 Thread Bill Woodcock via EV
> On Mar 22, 2021, at 7:17 PM, EVDL Administrator via EV > wrote: > > On 22 Mar 2021 at 11:33, Willie via EV wrote: > >> How can they efficiently extract heat from such cold air? I'm eager >> to learn details and see evaluations. > > They can indeed extract heat, but I'm not so sure

Re: [EVDL] Mitsubishi air source heat pumps

2021-03-22 Thread Alan Arrison via EV
They can't, I don't care what they say. The laws of physics still apply. The "heat" that is being discharged might be 60F which is hot compared to 0F. They would have to circulate thousands of cubic yards of 0F air to obtain even a tiny amount of "heat". Someone asked for link:

Re: [EVDL] Mitsubishi air source heat pumps

2021-03-22 Thread EVDL Administrator via EV
On 22 Mar 2021 at 11:33, Willie via EV wrote: > How can they efficiently extract heat from such cold air? I'm eager > to learn details and see evaluations. They can indeed extract heat, but I'm not so sure "efficiently" necessarily applies. I have a Mitsubishi Mister Slim M series

[EVDL] Mitsubishi air source heat pumps

2021-03-22 Thread Willie via EV
Someone asked for link: https://www.mitsubishicomfort.com/benefits/hyper-heating There has to be a catch. How can they efficiently extract heat from such cold air? I'm eager to learn details and see evaluations. ___ Address messages to