Tim Robinson
@gr0mit.bsky.social
Retired from running a telecommunications business. Two children. Two lovely grandchildren. Still very cross about Brexit.
overall system power output into the house.
October 24, 2025 at 6:24 PM
overall system power output into the house.
this is my theory. So I may need to throttle down the other rads to increase the overall system power. Chatgpt told me i'd not increase overall power. But I think this might have parallels to impedance matching of a transmission line to optimise power. Maybe that's a stretch too far...!
October 24, 2025 at 4:39 PM
this is my theory. So I may need to throttle down the other rads to increase the overall system power. Chatgpt told me i'd not increase overall power. But I think this might have parallels to impedance matching of a transmission line to optimise power. Maybe that's a stretch too far...!
So this has got me thinking. I have a 'big' radiator far away that struggles to get hot and gets far less flow than some much smaller rads that have much lower power dissipation. So if I throttle flow to small rads, to encourage more to BigRad, does the overall system heat output inc or dec?
October 24, 2025 at 4:10 PM
So this has got me thinking. I have a 'big' radiator far away that struggles to get hot and gets far less flow than some much smaller rads that have much lower power dissipation. So if I throttle flow to small rads, to encourage more to BigRad, does the overall system heat output inc or dec?
Yup. We are waiting for my next fix! I've built a low temperature weather compensated system based on Tomas's videos. So far working well..!
October 15, 2025 at 9:48 PM
Yup. We are waiting for my next fix! I've built a low temperature weather compensated system based on Tomas's videos. So far working well..!
so that's nearly 1000 litres per hour? Wonder why my flow is only around 660 litres/hour. I'm wondering if my pump is a bit short of oomph, or whether it's just working as designed?
September 11, 2025 at 3:29 PM
so that's nearly 1000 litres per hour? Wonder why my flow is only around 660 litres/hour. I'm wondering if my pump is a bit short of oomph, or whether it's just working as designed?
Hey Tom, just looking at your historical data. What unit is the flow rate in? l/s?, m^3/hr? or something else?
September 11, 2025 at 3:21 PM
Hey Tom, just looking at your historical data. What unit is the flow rate in? l/s?, m^3/hr? or something else?
Oooh i guess i could stick in a Shelly 1 PM rather than faff with a kWh meter. I will have a rummage through my box of bits!
September 10, 2025 at 6:08 PM
Oooh i guess i could stick in a Shelly 1 PM rather than faff with a kWh meter. I will have a rummage through my box of bits!
urgh. That's so annoying....Now I'm going to have to meter the power used by the boiler 🙄 which means installing a kwh meter into my board and adding a feed to my esp32 meter pulse counter.
September 10, 2025 at 4:01 PM
urgh. That's so annoying....Now I'm going to have to meter the power used by the boiler 🙄 which means installing a kwh meter into my board and adding a feed to my esp32 meter pulse counter.
ok so here's mine. emoncms.org/app/view?nam... I've not got a kwh meter on the boiler electricity supply as I think it's quite negligible compared to the gas usage!
Emoncms - app view
emoncms.org
September 10, 2025 at 3:30 PM
ok so here's mine. emoncms.org/app/view?nam... I've not got a kwh meter on the boiler electricity supply as I think it's quite negligible compared to the gas usage!
Did I imagine it or are you uploading gas boiler performance stats to openheatpumpmonotor.org?
September 9, 2025 at 2:58 PM
Did I imagine it or are you uploading gas boiler performance stats to openheatpumpmonotor.org?
Ooooh. Videos would be great if you have time.
September 9, 2025 at 2:55 PM
Ooooh. Videos would be great if you have time.
Are you going to post progress? I'm really interested and wondered if this is something that we should be doing. We'd need to mount our ASHP above our back door I think, so is not a straightforward install. But a very simple pipe run.
September 9, 2025 at 2:49 PM
Are you going to post progress? I'm really interested and wondered if this is something that we should be doing. We'd need to mount our ASHP above our back door I think, so is not a straightforward install. But a very simple pipe run.
Exciting times! Are you doing all the plumbing too?
September 6, 2025 at 9:19 PM
Exciting times! Are you doing all the plumbing too?
How Hard Can It Be?
September 6, 2025 at 9:14 PM
How Hard Can It Be?
Installing your own heat pump? Sounds exciting. But HHCIB?
September 6, 2025 at 8:01 PM
Installing your own heat pump? Sounds exciting. But HHCIB?
I've changed the headings to reflect the values in Watts!
September 3, 2025 at 4:41 PM
I've changed the headings to reflect the values in Watts!
don't have an email for you and I think your DMs are blocked?
September 3, 2025 at 4:40 PM
don't have an email for you and I think your DMs are blocked?
I can send you my spreadsheet which was loosely based on your video if I can DM it?
September 3, 2025 at 4:25 PM
I can send you my spreadsheet which was loosely based on your video if I can DM it?
are we talking deltaT between flow and return, or between av flow temp and room temp?
September 3, 2025 at 4:23 PM
are we talking deltaT between flow and return, or between av flow temp and room temp?
pump is set to fixed rate.
September 3, 2025 at 4:18 PM
pump is set to fixed rate.
well i was hoping to simulate a heat pump at DT20. That's clearly not going to work with the heat losses I have calculated.
September 3, 2025 at 4:17 PM
well i was hoping to simulate a heat pump at DT20. That's clearly not going to work with the heat losses I have calculated.