To Daikin DZK or not
Snohomie
| Posted in GBA Pro Help on
It would be nice to have zones using a single indoor air handler. But my gut tells me that this DZK thing would cause way more friction loss and in the end would be less energy efficient.
Thoughts?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
Search and download construction details
Replies
Do a good job of duct design and efficiency impact will be low. But only you can put a value on increased comfort.
Theses systems can certainly be made to work and can be reasonably efficient. It likely won't be as efficient as a couple 1:1 systems. The lower the load of a home, the less zoning is an issue generally. Good modulation also takes care of a lot of comfort issues.
One of the bigger problems will be that I think the smallest unit is 3 tons. Daikin equipment is also expensive.
See here for more discussion: https://www.greenbuildingadvisor.com/question/difficulty-finding-a-modulating-multi-zone-air-source-heat-pump
I am designing a fujitsu slim duct system and considering implementing a VAV of some sort to drop the temp of my little used conditioned attic space. It will be a slave with no ability to call for heat. This should work reasonably well as the space has a notably lower heat loss to volume ratio than the 2nd floor space served by the system. The biggest reason for doing this to stretch the cold weather capacity a bit further for short periods. It may yield some energy use benefits, but I will only push that so far due to moisture concerns. I still have some numbers to crunch to see if it will work and make sense. It will be a bit of a science experiment.