Free air cooling

[Charley3]

Hi there i am a newbie to the forum. i have a project in a dairy plant for a evaporator drying plant that requires some cooling to the building that the plant is contained in to leave it comfortable for process workers. I have been supplied with the loads that the plant will generate (total of 254Kw) and the building has a volume of 6350m³, ambient temperature max 25°c and target temperature in the building of max 35°c. My question is how do i work out the require air changes per hour to achieve the cooling required. Thanks and waiting for your help!

 

[willard3]

This is not a class in thermodynamic, it is a web forum.

 

[lukaiENG]

I agree with Willard - you need to do some legwork yourself if you're ever going to get any traction as an engineer.
As a starting point, you need to look at the enthalpy change from your air intake to your air discharge, this will allow you to work out the AC/h.
You need to know humidity values as well as temperatures, get to know and love your psychrometric charts, this is a great application for their use.

 

[BronYrAur]

You need a lot more than a forum can (or should) provide. The 254kW given to you may just be the process power consumption. You still need the building envelope load. Also, I would imagine that the drying process either dumps humidity into the building or exhausts it outside. Either case presents HVAC challenges that you must address. You need to do a complete load of envelop, people, ventilation, and internal process loads. That gives you a starting point of total cooling required.

If worker comfort is the only concern, spot coolers may be an option.