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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Heating and cooling: How do I size an expansion vessel

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    • CommentAuthorVespar
    • CommentTimeNov 8th 2009
     
    Hi
    I am trying to work out the size of expansion vessel I need. I already have a pressurized central heating system with its own 20l expansion vessel running at 1 1/2bar. I am planning to install a 20kW pellet boiler and a 2000l accumulator tank. Total volume calculated = boiler 117l, pipework 3.75l + tank = 2121l is a 4%/85l expansion vessel sufficient and what pressure should it be set to?
    Any info would be of great help
    • CommentAuthorJulian
    • CommentTimeNov 8th 2009 edited
     
    Hi Vespar
    I am not an expert but with that size store I think you may need a vessel nearer to 200 litres. This is based on advice I was given for a similar sized system. Do you have any figures for the boiler? Eg operating pressure - the store / accumulator can be specified when you have this figure.
    Lots of useful stuff here if you've not already found it (take a few days holiday and read through....)
    http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=660&page=12#Item_1
    • CommentAuthorCWatters
    • CommentTimeNov 9th 2009
     
    I've not used it but there is a tool here for sizing exp vessels...
    http://www.mikrofill.co.uk/simulator.php

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