Energy balance of Ideal loads air system

Hi everyone,

I have question

In InputOutputReference,the balance of energy is this
“When the economizer is not active, these values are related by the following equation:
Zone Ideal Loads Supply Air Total Cooling Energy + Zone Ideal Loads Heat Recovery Total Cooling
Energy = Zone Ideal Loads Zone Total Cooling Energy+ Zone Ideal Loads Outdoor Air Total Cooling

However, the results I got is not so. This Balance is not kept.
(economizer is off)

I guess that heat recovery affects this.

・Heat recovery energy is not zero when the outdoor air flow rate and Zone Ideal Loads Heat Recovery Active Time are zero.
・Results sometimes show" heat recovery heating energy > outdoor Air heating energy ".

I hope someone have idea about this

It’s hard to know what is going on without a sample file. I would also highly recommend the “HB Annual Loads” component in the LBT 1.2.0 plugin. The energy balance it gives is almost always complete.

Hi @chris

I’ll try that component.
I also found the topic about energy balance and your answer.
This is helpful information.
How are the energy balance items calculated?

Thank you for your answer.

1 Like