paceinternet
15-12-2011, 05:56 PM
Some interesting discussion on defrosting in this thread:
http://www.refrigeration-engineer.com/forums/showthread.php?33840-Buffer-Tank-Assisted-Defrost
So I have something for Pilko and MikeHolm and mad fridgie to pass comment on.
What do you think the efficiency difference would be between that method, or other methods, and avoiding defrost altogether by raising the ambient air temperature going into the outside coil?
If you could direct some warm air towards the intake to keep the overall input air temperature at ? (whatever temperature avoids icing) in a controlled way. This energy could come from a buffer and only be introduced when a sensor indicates it is needed. Maybe easier in an air to water system, but the initial question is, would the overall efficiency be better, because when you go through a conventional defrost routine, it must discharge quite a lot of energy to ambient and be lost, whereas the concept I am describing could recover some, or all, of that energy.
Conventionaly, there must also be some drop in efficiency as ice builds up on the fins and coil which would be avoided.
I don't know if any hot gas defrost systems attempt to do anything like this, or do they just heat the coil to remove ice when it has built up?
Thanks
http://www.refrigeration-engineer.com/forums/showthread.php?33840-Buffer-Tank-Assisted-Defrost
So I have something for Pilko and MikeHolm and mad fridgie to pass comment on.
What do you think the efficiency difference would be between that method, or other methods, and avoiding defrost altogether by raising the ambient air temperature going into the outside coil?
If you could direct some warm air towards the intake to keep the overall input air temperature at ? (whatever temperature avoids icing) in a controlled way. This energy could come from a buffer and only be introduced when a sensor indicates it is needed. Maybe easier in an air to water system, but the initial question is, would the overall efficiency be better, because when you go through a conventional defrost routine, it must discharge quite a lot of energy to ambient and be lost, whereas the concept I am describing could recover some, or all, of that energy.
Conventionaly, there must also be some drop in efficiency as ice builds up on the fins and coil which would be avoided.
I don't know if any hot gas defrost systems attempt to do anything like this, or do they just heat the coil to remove ice when it has built up?
Thanks