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| Green Building Bible, Fourth Edition |
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These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
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Posted By: tonyWhy insulate heating pipes, inside a heated envelope all the heat lost is helping, insulation in that case is a waste of time, materials and effort. If they are outside te heated envelope then a redesign is needed.Because this is for DHW pipes which are significantly warmer that the surrounding air and also the pipes close to the tank which again have significant losses. However, there is a point where it is not worth insulating above but I wondered if that changed if the pipe temp was higher.
Posted By: borpinBecause this is for DHW pipes…It's for CH pipes under the floor.
Posted By: borpinThis may be a really stupid question, but I presume the temperature of the water in the pipe makes a difference. Is that linear? I.e. the hotter the water in the pipe the thicker the insulation can be before the benefits drop off?Depends what you mean by “benefits”. For our little sidetrack on the fall-off of effectiveness with increased insulation thickness for the first few mm the temperature of the pipe is irrelevant. Once you get passed that and start balancing the cost of more insulation vs the cost of the heat lost then, yes your intuition is right, higher temperature does justify more insulation.
Posted By: Ed DaviesMmm but my question was moving the discussion on. Even so my CH pipes directly connected to the tank are pretty hot so it is relevant.Posted By: borpinBecause this is for DHW pipes…It's for CH pipes under the floor.
Posted By: Ed DaviesHow do you model that in the equation? There seemed to be nothing relating to the temperature differential between pipe temp and environmenal temp.Posted By: borpinThis may be a really stupid question, but I presume the temperature of the water in the pipe makes a difference. Is that linear? I.e. the hotter the water in the pipe the thicker the insulation can be before the benefits drop off?Depends what you mean by “benefits”. For our little sidetrack on the fall-off of effectiveness with increased insulation thickness for the first few mm the temperature of the pipe is irrelevant. Once you get passed that and start balancing the cost of more insulation vs the cost of the heat lost then, yes your intuition is right, higher temperature does justify more insulation.
Posted By: borpinHow do you model that in the equation?We don't, because it's not relevant when you're only looking at how the thermal resistance changes with the thickness of the insulation.
