Has anyone ever used their heat pump for cooling the house via UFH?
If so what are the optimal settings used?
Most manufacturers don't recommend it with UFH because of rrisk of forming condensation on the floor
Where is the condensation formed, on the floor surface itself?
Keep the flow return higher than the dewpoint and your floors wont condense water vapor. You will get condensation on the manifolds and exposed uf pipes, but not an issue if addressed.
Also a good idea to have a condensate pipe installed from your unit inside the house, if your going to cool the slab with the heat pump. Most have an evaporation tray and that may suffice, depends on the unit and how much condensate the refrigerant pipes produce.
There is a drain off the back of the unit.
We have HRV so exposed moisture doesn't last long anywhere in the house.
Did a bit of research and the average temp of the water will be 16-18 degrees. The house is hitting 30 degrees at the minute so If I can get that down to 25 It would make a huge difference..
wow 30 is hot, do you have summer bypass on your MHRV? Will make a massive difference at night if you turn up the fans.
I have MHRV and air to water heating. I turned on summer bypass the last few evenings and found very little difference.
I wonder would it be expensive to put in air conditioning when MHRV is already fitted. Bedrooms are nearly 26 degrees at night at the moment.
The first summer I had the HRV I quickly found out the summer bypass is not worth a fiddlers.
If the outside air is warm and this also gains a few degrees entering a warm house you would need a HRV for every 2 rooms of the house to make any noticeable difference. Max fan with all vents blocked bar kitchen/sit and bedroom might drop a degree..
I Have summer bypass from April-October every year and still have to open windows and doors during the day to try cool the house.
I can buy one of these for my ventilation unit but is almost the same price as my whole system cost fully installed and no guarantee it will work effectively. https://www.phstore.co.uk/zehnder-comfocool-q600
Thank you that is the same price more or less as my heat recovery system cost to install. I might call the plumber that installed and see if he has any solution.
Interesting on the summer bypass comments. During the day we have the mhvr set to a low fan speed, but at night the speed in increased to 80% with the bypass on, have found the house is cooler by 3c in morning when hot weather is here just with the bypass and no cooling from the heatpump.
I blocked 5 supply vents in unused rooms(stuffed old t-shirts in the opening) and it has made a significant difference to the rooms we use, dropped from 29 to 27 overnight. The weather did get cooler today so the cool breeze is making a huge difference. My fan speed is 33% 66% and 100% I left them at 66%
I also turned the cooling function on the heat pump and it is definitely cooling the floor most noticeable on tiled surfaces..