ASHP defrost cycle

[SteamyTea]

Does anyone have an proper data on this?

It would be interesting to correlate it with local weather data and see what conditions make it better, or worse.

[billt]

Depends what you mean by proper data.

 

A defrost energy calculator has recently been added to the Open Energy Monitor heat pump app, so you can see data from lots of monitored systems at https://heatpumpmonitor.org/

 

There's a discussion on defrosting at https://community.openenergymonitor.org/t/ashp-sizing-for-freezing-conditions/24802/60

 

My system shows a calculated energy loss of 7% for defrosting, but these are quite extreme conditions. (-6C last night and 94% rH.

 

[SteamyTea]

48 minutes ago, billt said:

epends what you mean by proper data.

Basically a time series, in a useful export format i.e. .csv, .txt, .xls

That can be correlated to local temperatures and RH, which is usually easy enough to get hold of.

 

Initially I would just look at instances of the defrost cycle happening, just to get a feel of the problem.