Get Living Zone Temp to Behave

asked 2021-04-29 11:58:26 -0500

sashadf1 gravatar image

Hi, I hope you are all doing well.

I am trying to implement an HVAC system (ideally a simple ASHP) to serve enough heating/cooling to the residential living zone so that the heating and cooling setpoint temperatures of 80 deg F are constantly met.

i.e., the LIVING ZONE AIR TEMPERATURE (DEG F) timeseries plot should look like a horizontal line at 80.

Unfortunately, my zone air temperature for the living zone deviates from the setpoint quite a bit throughout the year, especially during the cooling season.

I have tried oversizing (by 2000%) the rated capacities and airflows through the single speed dx heating/cooling coils and supplementary resistance heating coil on the supply side of the air loop, but oversizing seems to make the problem worse.

Is there anything I can do to my ASHP (through a measure, etc.) so that it will be able to meet load (i.e. temp = setpoint) 100% of the time? Does changing the rated capacities and airflow rates not actually change the amount of instantaneous heating/cooling delivered to the zone that is used in heat balance?

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I tried using a variable speed ASHP instead of single stage and that did not work either.

sashadf1 gravatar image sashadf1  ( 2021-04-30 13:05:06 -0500 )edit