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richlist wrote:If you have solar pv panels it makes sense to heat your hot water tank via an immersion heater from your solar energy for free.
PhaseThree wrote:Unfortunately you are unlikey to get anywhere near a COP of 4 even in summer.
Take a look at http://www.narecde.co.uk/wp-content/uploads/2014/11/COP-of-water-heating-technologies.pdf for a real world analysis of an ASHP used for hot water. Their conclusion :-"The ASHP system daily COP for the month of September is reasonably consistent within the range 1.44 to 1.88, with average for the month of 1.59".
It's easy to imagine the COP falling below 1 in the cold and wet of winter at which point you would do better with the immersion.
dspp wrote:richlist wrote:If you have solar pv panels it makes sense to heat your hot water tank via an immersion heater from your solar energy for free.
Yes, that is true. However by putting the same amount of elec through an ASHP you can essentially multiply it by about x4 to get even more warmth into your house. If, of course you have both an ASHP and PV fitted.
regards, dspp
fisher wrote:I have an ASHP which is our only source of heating ... Ask if you want more information on anything specific.
dspp wrote:Are you able to give some data that I can pop in my before/after/etc comparison spreadsheet
richlist wrote:dspp wrote:richlist wrote:If you have solar pv panels it makes sense to heat your hot water tank via an immersion heater from your solar energy for free.
Yes, that is true. However by putting the same amount of elec through an ASHP you can essentially multiply it by about x4 to get even more warmth into your house. If, of course you have both an ASHP and PV fitted.
regards, dspp
My solar PV panels produced 420Kwh of energy during the whole of April. Hot water used 54Kwh of that so plenty left for running other stuff like ASHP.........
fisher wrote: That is, warming the house from 19 degrees to 21 degrees will take a couple of hours, warming it from 15 degrees to 21 degrees will take a couple of days in winter!
GoSeigen wrote:fisher wrote: That is, warming the house from 19 degrees to 21 degrees will take a couple of hours, warming it from 15 degrees to 21 degrees will take a couple of days in winter!
Interesting anecdotal view, but the above makes no sense to me. You are saying:
1. warming the house from 19 to 21 degrees will take a couple of hours , so
2. warming the house from 17 to 19 degrees will also take a couple of hours (if not, why not?), so
3. warming the house from 16 to 17 degrees will take less than a couple of hours, so
4. six hours max to warm from 16 to 17, then 17 to 19, then 19 to 21.
YET...
to warm the house from 16 to 21 degrees will take a couple of days? Could you explain why this is so?
GS
richlist wrote:dspp wrote:richlist wrote:If you have solar pv panels it makes sense to heat your hot water tank via an immersion heater from your solar energy for free.
Yes, that is true. However by putting the same amount of elec through an ASHP you can essentially multiply it by about x4 to get even more warmth into your house. If, of course you have both an ASHP and PV fitted.
regards, dspp
My solar PV panels produced 420Kwh of energy during the whole of April. Hot water used 54Kwh of that so plenty left for running other stuff like ASHP.........
fisher wrote:richlist wrote:dspp wrote:
Yes, that is true. However by putting the same amount of elec through an ASHP you can essentially multiply it by about x4 to get even more warmth into your house. If, of course you have both an ASHP and PV fitted.
regards, dspp
My solar PV panels produced 420Kwh of energy during the whole of April. Hot water used 54Kwh of that so plenty left for running other stuff like ASHP.........
How do you ensure that your immersion only kicks in when the solar PV panels are producing energy? Do you have some sort of relay switch being triggered by the electricity generation?
I also have 4KW of Solar Panels but I rarely use the electricity generated for the Immersion. Most of the time it used by washing machines or tumble driers but this does require us to switch them on manually when the sun shines. Otherwise, our ASHP heating, Fridges or Computers will soak up what they can when they're running automatically.
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