GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Why your minisplit is likely not “modulating” at all

user-1137156 | Posted in Energy Efficiency and Durability on

In other posts I’ve made observation of specified “capacity reduction” of several hyper heat like systems.
Those observations were all based specifications, which are all at 47f. I observed that most offer a 1/3 ratio. some offer a 1/9 or 1/10 ratio. I found this graph of constant speed capacity.
https://www.highseer.com/pdf/Heat_Pump_Heating_Performance_Chart.pdf
This dramatically alters how we must interpret the specification as outside temperature changes. !/3 capacity ratio @ 47f will maintain constant output. NO MODULATION.
There are some multi splits that have a min/max 0f 1/9 or 1/10 which if we started with the 1/3 modulation offer a reduction of 1/3 of nominal output ie an 18k can drop to 6k.
it takes a 1/3 capacity reduction to maintain constant output..

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |