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Posted By: crusoeSo my question, before telling you what I would fit, is: 'How are you intending to install the system?'
Posted By: crusoeIt appears that ETs installed to 'best practice' - ie sealed systems being allowed to stagnate - are failing long before they were expected to...see recent threads on the subject.So my question, before telling you what I would fit, is: 'How are you intending to install the system?'
Posted By: owlmanI assume you mean me, 'cept it doesn't seem to work.
Posted By: an02ewPosted By: crusoeSo my question, before telling you what I would fit, is: 'How are you intending to install the system?'i am not installing myself, but have a very close friend that was in the ST business for many years(at the beginning) we have chewed the fat over which type of system drain down or pressurized, but are not really sold on either yet. So maybe give us your ideal system.
Posted By: crusoeI think terminology is getting in the way of a full discussion. If you are ideologically opposed to the idea of a thermal store, but like the idea of a buffer tank
Posted By: crusoesuspect the DHW element may be the eco-confusion here - ie you like the idea of storing sunshine, but want to keep the hot water separate? In which case you want hot water cylinder and separate thermal store, fully specced for the future when you can plug-n-play all the new renewable technologies into it (unlike a buffer tank) and thence, if you so desire, to your DHW too.
Posted By: Ed DaviesPosted By: borpin: “I am also sold on the drain back system. Why have a complicated pressurised system when gravity will do the job for you?”This paragraph seems to be conflating a number of distinct issues but I'm not sure which. Gravity doing what job? - thermosyphon or frost protection?
Posted By: Ed DaviesPosted By: borpin: “Firstly just to check, evac tubes have a smaller collector area than physical area - right? If so then per m2 of roof they are less efficient? Or have I got that completely back to front.....”Yes, you're right if the sun is bright or the collector fluid temperature is low. If the sun is not so bright and fluid is hot then ETs start to win. Since that's the case which determines the length of your DHW solar season I think it's important.
Posted By: borpinYes but if you need a 6M2 collector and do not have the space for the ETs then that has to be a factor as well does it not?
Posted By: an02ewAre you saying that when calculating the size of ET i should use the gross collector area, the aperture area or the absorber area? There is a huge difference between them.
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