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Last seen: Oct 4, 2026
When we first moved into the house, it had single glazing, cavity wall insulation, and about 150mm of loft insulation. If I take all the upgrades out ...
Posted by: @cathoderay All I am doing is emphasising the point that the long term averages used to calculate the HTC must be based on frequent enou...
Posted by: @jamespa Whilst I don't like determining things based on a single measurement point because you don't have a tool to spot errors, I also...
@cathoderay @ian33a The way the calculation works is to determine the Heat Transfer Coefficient (HTC) - the total energy required to keep the indoo...
@ian33a You only need the heat energy in kWh output by your heating system for 1 cold month e.g. January, along with your average indoor temperature...
@ian33a I recently did a heat loss calculator spreadsheet based on gas usage over a cold period in winter e.g. January. I'm sure you could easily ad...
@bobflux The hydraulic simulator is very interesting. I don't know if I can give you enough information to do a reasonable model of our heating sys...
Changing the 15mm pipe would be very disruptive and no doubt expensive, so I don't want to go there. As an alternative, I would be happy to compromi...
Posted by @jamespa There are a couple of possible installer parameters namely conf heat build pump, unit %pwm, default auto, but can be set 50%-100...
Post by: @robs Is the pipework the original, like the radiators? Also, your calculated pressure drops seem quite low. Thanks for the tip abo...
@jamespa The DT will be what the DT will be, its determined by the equations you set out above. This means that most of the time (with a constan...
@jamespa Thanks for the feedback, the pipe work is 22mm to the airing cupboard where the hot water tank is situated, and then disappears off into in...
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