Sun, 19 Apr 2026 05:02:18 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219225#Comment_219225 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219225#Comment_219225 Wed, 11 Feb 2015 19:01:32 +0000 johnuready
I'm using a Vent Axia Kinetic.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219227#Comment_219227 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219227#Comment_219227 Wed, 11 Feb 2015 19:54:45 +0000 borpin
It is running slowly (3 out of 10) which helps the recovery.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219233#Comment_219233 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219233#Comment_219233 Wed, 11 Feb 2015 20:03:44 +0000 Greenfish
Had a go using IR thermomter a little while ago, hoping this was wildly inaccurate as the results were so dissappointing. My other problem is that my wet/smelly extract rooms are not the hottest ones.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219238#Comment_219238 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219238#Comment_219238 Wed, 11 Feb 2015 20:22:41 +0000 borpin https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219292#Comment_219292 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219292#Comment_219292 Thu, 12 Feb 2015 11:14:19 +0000 johnuready
The first issue I have with my MVHR is the "From Atmosphere" temperature at the MVHR spigot. Its currently 3.7 C outside and I'm reading 8.1 C.

The insulated pipe travels through a "cold" roof (vented) space anybody seen a temperature increase when insulated?

Unfortunately I do not have sensor in the roof space, perhaps in the coming days.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219294#Comment_219294 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219294#Comment_219294 Thu, 12 Feb 2015 11:20:50 +0000 ringi https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219301#Comment_219301 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219301#Comment_219301 Thu, 12 Feb 2015 11:41:44 +0000 johnuready https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219302#Comment_219302 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219302#Comment_219302 Thu, 12 Feb 2015 12:02:27 +0000 ringi
Are the sensors digital? (If not the cable length to the A/D may effect the reading.)

Is the outside sensor protected from rain and wind?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219316#Comment_219316 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219316#Comment_219316 Thu, 12 Feb 2015 13:33:15 +0000 johnuready
Good idea I have never bothered with confirming sensors before but in this case it's a good idea to check any variance. I have sensors in all 4 spigots.

I am using DS18B20 1 Wire Digital with an accuracy of +/- 0.5 degree.

Also loft space needs a sensor ASAP.

Looks like I'm ordering new sensors.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219431#Comment_219431 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219431#Comment_219431 Fri, 13 Feb 2015 13:37:55 +0000 borpin Posted By: johnureadyI'm using an online system to track loads of sensors I installed while building the bungalow.Which one?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219561#Comment_219561 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219561#Comment_219561 Sun, 15 Feb 2015 10:49:20 +0000 johnuready https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219562#Comment_219562 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219562#Comment_219562 Sun, 15 Feb 2015 10:56:32 +0000 SteamyTea http://www.engineeringtoolbox.com/heat-recovery-efficiency-d_201.html]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219564#Comment_219564 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219564#Comment_219564 Sun, 15 Feb 2015 11:16:26 +0000 johnuready https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219565#Comment_219565 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219565#Comment_219565 Sun, 15 Feb 2015 11:23:58 +0000 SteamyTea Hard to tell if it is good or not without knowing the mass of air that passed though the heat exchanger.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219568#Comment_219568 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219568#Comment_219568 Sun, 15 Feb 2015 11:28:42 +0000 johnuready https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219570#Comment_219570 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219570#Comment_219570 Sun, 15 Feb 2015 11:53:34 +0000 SteamyTea
For every 1°C difference the maximum energy is therefore 0.0456 kWh

If your fan is running at 50% the power rating it is then using 0.075 kWh (or 75W continuous power).
And if your heat exchanger is running at 95% efficiency then you can get 0.0433 kWh energy recovered
You seem to be getting 3 times that, this implies that there was a larger temperature difference, 3°C on average. Does that seem right?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219572#Comment_219572 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219572#Comment_219572 Sun, 15 Feb 2015 12:09:54 +0000 johnuready
I was concerned about a 3 degree temp difference between the outside temperature and the temperature at the MVHR. After checking the roof space under the insulation, the temperature held in the OSB airtight box and plasterboard (bungalow) you can feel the stored heat. Once I get more sensors in I can measure the roof space temperatures. Anybody else found 3 to 4 degree increase on incoming fresh air through a roof?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219677#Comment_219677 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219677#Comment_219677 Mon, 16 Feb 2015 23:38:38 +0000 Viking House Posted By: johnureadyAnybody else found 3 to 4 degree increase on incoming fresh air through a roof? If you're bringing in air through the roof space and its gaining 4 degrees then you're cooling the roof space which increases the heat-loss from the house. Adding these 4 degrees to the efficiency of the MVHR won't give you an accurate efficiency reading. Some MVHR manufacturers use inefficient fans and add the heat-loss from the fans to their efficiency figures, which gives inflated efficiency results. The difference between lab results and in house results is often between 10-15%.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219679#Comment_219679 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=13097&Focus=219679#Comment_219679 Tue, 17 Feb 2015 00:25:30 +0000 Gotanewlife