Mitsubishi cycling while on chilled water output
@downfield I think the cooling capacity ratings for you fan coils are misleading for your application (I am assuming the units are mounted just above skirting level) as in this position cooling becomes self limiting. You may well achieve the rated cooling output from them when you first switch on but after a short period of running the cooler (denser) air that they have previously generated will sink back to floor level only to sucked back into the fan coil thus now reducing effective delta t. Thus to be effective at cooling the room the fan coils need to be mounted higher up at head height or ideally at ceiling level. At skirting level you'll get cool ankles I guess but not a great deal more.
Perplexity AI summarises as follows: The height at which you position a cooling device significantly affects its efficiency in a room.
Higher placement (ceiling or high on the wall) generally improves efficiency because hot air rises, so the device can more effectively cool the warmest air at the top of the room. As this cooled air sinks, it helps distribute cool temperatures more evenly throughout the space.
Better air circulation is achieved when the cooling device is higher, allowing it to exchange and mix air more effectively across the room, which enhances overall cooling performance.
If a cooling device is placed low (near the floor), it mainly cools the already cooler, denser air at floor level, which is less efficient for whole-room cooling. The device may not be able to address the warmer air accumulating near the ceiling, leading to uneven temperatures and longer run times.
The energy cost to generate cool air does not change with height, but the ability to target and remove heat from the room is improved at higher positions, making the cooling process more effective.
In summary, placing a cooling device higher in the room increases its efficiency by targeting the warmest air and improving air circulation, resulting in more even and effective cooling.
So is the cooling capability for these fan coil units being overhyped by the marketing people?? Sorry to say but I think that's a good possibility.
- 22 Forums
- 2,097 Topics
- 46.2 K Posts
- 34 Online
- 3,385 Members
Latest Posts
-
RE: Mitsubishi cycling while on chilled water output
@downfield I think the cooling capacity ratings for you...
By IaAck , 29 seconds ago
-
RE: Weather compensated secondary circuits with Biomass
@sune thanks for the LK link, looks like a possible opt...
By AndyCoo , 14 hours ago
-
RE: Heat pump solutions and/or installer recommendations for France
No idea, but Google-Fu leads me to Bon chan...
By Scalextrix , 15 hours ago
-
If you are thinking of heating on the immersion conside...
By JamesPa , 1 day ago
-
RE: Surface mount or bury primaries for heat pump installation?
@tomasmcguinness, I think your best bet would be using ...
By Aventus Eco , 1 day ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@toodles all depends on asking the right questions! And...
By Tim441 , 2 days ago
-
RE: Commencing on an ASHP Installation Process
I received confirmation this morning that my Greener Ho...
By Sheriff Fatman , 2 days ago
-
@jamespa Thanks for the advice - very helpful. I had al...
By abam48 , 3 days ago
-
RE: Adding battery storage to SolarEdge PV system
@chandykris No need to apologise at all! I forgot to ad...
By Toodles , 4 days ago
-
RE: Say hello and introduce yourself
Yes please do Suggesting a loss in the region...
By JamesPa , 4 days ago
-
As I have reported elsewhere we turned on the cooling o...
By downfield , 5 days ago
-
-
@el3b Hi, sorry to hear that, it is advisable to instal...
By ASHP-BOBBA , 6 days ago