Question-and-Answer Resource for the Building Energy Modeling Community
Get s tarted with the Help page

# How is fraction latent, radiant, lost and convective decided for the heat gain from equipment? And why is the cooling energy higher when convective gain is 1, as compared to when the radiant gain is 1?

Greetings!

I wanted to understand how is the fraction latent, radiant, lost and convective decided for the heat gain from electric equipment? What is the typical distribution of fraction heat gain from the computer in a space?

I understand that the cooling energy is lowest when fraction lost is 1. But why is cooling energy higher when fraction latent is 1? And why is the cooling energy highest when convective gain is 1?

My results are as follows: Cooling energy when fraction lost is 1 = 14265 kWh Cooling energy when fraction latent is 1 = 16094 kWh Cooling energy when fraction radiant is 1 = 17783 kWh Cooling energy when fraction convective is 1 = 19902 kWh

Thank you.

edit retag close merge delete

Sort by ยป oldest newest most voted

One reason might be that some of the radiant gains are being lost from the building. Since radiant gains are distributed to the surrounding wall surfaces, they are turned into space loads when that energy is being convected from the wall into the air of the zone. While that is happening some of the radiant gains that have been absorbed by the wall are being transmitted through the wall to the exterior and lost to the external environment.

more

I agree with your explanation Jason, thank you.

( 2019-03-14 13:35:31 -0500 )edit