Sat, 09 May 2026 21:07:25 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140223#Comment_140223 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140223#Comment_140223 Tue, 20 Mar 2012 21:35:54 +0000 DamonHD
Rgds

Damon]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140224#Comment_140224 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140224#Comment_140224 Tue, 20 Mar 2012 21:49:05 +0000 borpin https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140240#Comment_140240 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140240#Comment_140240 Tue, 20 Mar 2012 23:14:16 +0000 Paul in Montreal
Internal temperature was 72F (22.2C) for most of the winter with the heating set to run as required to maintain this temperature 24/7

Paul in Montreal.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140302#Comment_140302 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140302#Comment_140302 Wed, 21 Mar 2012 15:41:28 +0000 WillInAberdeen
I downloaded the HDD data for every station within about 20 miles of me. The difference between the highest and lowest was 18%. Surprisingly the station nearest the sea was not the lowest HDD. Two stations a mile apart were different by 6%.

From this I agree with Seret that the available HDD data is not very precise and I shouldnt sweat over making corrections for my own site location.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140344#Comment_140344 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140344#Comment_140344 Thu, 22 Mar 2012 06:59:14 +0000 borpin Posted By: WillInAberdeenThe difference between the highest and lowest was 18%. Surprisingly the station nearest the sea was not the lowest HDD. Was the trend the same i.e was is consistently different 18%.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140347#Comment_140347 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140347#Comment_140347 Thu, 22 Mar 2012 07:32:19 +0000 SteamyTea The way to get around this is to calculate the Standard Error of the Mean SD/N^0.5, this will allow you to set the upper and lower bounds, and as long as 95% of your data is within these, you have nothing to worry about.
Alternatively you you can go down the ensemble route where you average all the results from the different sources during the same time period. I would use mode rather than mean if there are enough data points as that automatically gets rid of the extreme reading (these are the ones that are most likely to be wrong). Think of this as a consensus method of looking at data. Look at what they have in common, not what they have that is different.
Statistics is your friend here and your data will not lie to you.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140370#Comment_140370 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140370#Comment_140370 Thu, 22 Mar 2012 10:20:42 +0000 borpin Posted By: SteamyTeaStatistics is your friend here and your data will not lie to you. I will resist.....]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140427#Comment_140427 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8828&Focus=140427#Comment_140427 Thu, 22 Mar 2012 17:44:28 +0000 SteamyTea ]]>