New Feature - Display "Current" Heat Loss

[critictidier]

Context

Please correct me if I’m wrong but one metric not currently displayed, and one that could provide another angle when comparing heating performance across buildings is Heat Loss, but not just the Heat Loss at the design temperature, but the Current Heat Loss.

Example

My heating demand projection design

However, the average demand in winter will be around 5kW.

Current Heat Loss Calculation

U value = 1.93 W/(m2*K)
Total Area = 184.87 m2
Delta_T = Current Room Temperature - Current Outdoor Temperature

Current Heat Loss Formula = U * A * Delta_T

Current Heat Loss = 1.93 * 184.87 * 0.6

Notes for comments

1. What are your thoughts on the benefits, if any, of this indicator?
2. That metric could also be added to the heatpumpmonitor website tables as one of additional fields to display.
3. You could also consider adding option to provide current heat loss at the target thermostat temperature, but unless you’re using Home Assistant, it might not be feasible to pass on your current target thermostat temperature to EmonCMS.

[Robert.Wall]

Can you try to use “present” or “now” rather than “current” when you mean now, because of the possibility of misinterpretation by non-native English speakers. (current loss = I²R loss ?)

[Timbones (Tim)]

That’s an interesting idea. I do something similar for my system, using the total heat transfer coefficient (w/K) calculated from usage. It could be useful to plot heat loss over time on My Heatpump chart, so that people can compare it to heat pump output.

It’s also possible to calculate the output from radiators, for comparing against what the heating system is producing:

This shows quite clearly that my (oversized) heat pump runs nicely when the produced heat (orange) is under the output of the radiators (red). Otherwise it will cycle.