Free software for heat load calcs & sizing A/C units?

[eskimoair]

Does anyone know where i can download some free software for calculating heat loads & sizing up A/C units?

I need to size up a A/C unit for a bodybuilders gym with about 150 people in it at any 1 time pumping iron.

[Samarjit Sen]

You may refer CoolPack. The link may already be in this forum. You will have to locate the same.

[nike123]

Coolpack software has module named "Cooling demand for air conditioned room"
http://tinyurl.com/2x83d9

[Samarjit Sen]

The Cool Pack download link is as follows :

http://www.et.web.mek.dtu.dk/Coolpack/UK/reg-download.html

[eskimoair]

Thanks guys very good program :)

BTW does anyone know where i can find the chart that tells you how many watts per sq meter you need for certain applications?

Or even a good quick and easy heat load calc sheet??

[nike123]

Thanks guys very good program :)

BTW does anyone know where i can find the chart that tells you how many watts per sq meter you need for certain applications?

Or even a good quick and easy heat load calc sheet??

Why do you need chart when you have software like that? Is this software very complicated for you?

[eskimoair]

The software is great whilst im in the office but a quick reference chart would be great whilst out in the field when i need to quickly size up a unit for a customer.

Of course the chart would have to be suitable for use is Sydney Australia.

[Tesla]

I find the AIRAH hand book the best for quick checks in the field, it's got all sorts of goodies in it. Made for Ausi + NZ. www.airah.org.au (http://www.airah.org.au) Ph 03 9328 4116. Good luck and welcome to the forum, I also work in Syd. 28 degs today, time for a beer.

[Samarjit Sen]

Visit the undermentioned link, it may be of help.

http://www.tombling.com/cooling/heat-load-calculator.asp

[eskimoair]

thanks guys ive been looking for a copy of that hand book...........sweeeet.

now it's time for a bundy & coke.

[eskimoair]

Ok i have come up with 90kw can some one verify this is correct or calculate it using your software?

Specs

Type of Business
Gym
Location
Brisbane Australia
Area
220sq/m
Ceiling
8m high from slab to the tin roof with insulation
People
120 people working out at peak times
Peak Time
3pm
Walls
4 external Besa Block walls
Floor
Concrete Slab

[eskimoair]

anyone got experience sizing air con for gyms?

[nike123]

That is job for HVAC engneer to go on site and consider all in his calculations. He also need to calculate needed ventilation and heat gain and loss by ventilaton, maybe consider heat recovery and etc. That is not something what you could properly done on forum or by phone. Without considering all said, you could be pretty much off from really needed capacity.

[Samarjit Sen]

Calculating the heat load, there are a large number of factors to be considered. Even while using the software, one has to have the basic knowledge and consider many factors. In the software you should put the proper inputs and then you can get the correct load. Otherwise follow your thumbrule .

[Abby Normal]

you would typically keep a gym cooler than say a house

gym needs fresh air, you need to check your ventialtion load for your 120 people.

the people will have a big gain also, probably 32 kW or there about, a lot of it will be latent.

If ventilation air is more humid than normal room air, I think you will need either reheat or a dedicated dehumidifier

[Abby Normal]

have you accounted from the heat gain of the lighting?

[eskimoair]

I have allowed for the metal halide lighting, yes.
Just need to work out how much fresh air i need per person...........

In coolpak it asks for the air change factor (ACF= the amount of times the air is completely changed over in a 24hour time peroid) is this where i enter how much fresh air i require?

[nike123]

I have allowed for the metal halide lighting, yes.
Just need to work out how much fresh air i need per person...........

In coolpak it asks for the air change factor (ACF= the amount of times the air is completely changed over in a 24hour time period) is this where i enter how much fresh air i require?

You enter number 240 (10 complete air changes in 1 hour is standard here in Croatia for gym) for ACF.
Also you need to consider windows, shading etc... , but Coolpack doesn't have that option

[Samarjit Sen]

CoolPack has the Window details. There are a lots of option in it.

[eskimoair]

You enter number 240 (10 complete air changes in 1 hour is standard here in Croatia for gym) for ACF.
Also you need to consider windows, shading etc... , but Coolpack doesn't have that option

Thanks nike123 :)
Can anyone from Australia chip in here? is 10 air changes an hour sufficient.

The gym has no windows.......just a roller door which is permanantly shut.

[nike123]

I totally oversee that. I did not use Coolpack for that purpose for few years! You are right Samarjit Sen.

[eskimoair]

so is 10 air changes correct?

When i enter that coolpak sizes the unit up as being in excess of 400Kw

[nike123]

No, ACF means Air Change Factor and it is expressed in number of air changes per 24 hours. So, if you have 100 m3 of room volume and 10 air changes in hour that mean that you have 1000m3/h or 240ACF. You have possibility to enter both of these values selecting proper input on form field.
Watch your units, they must be metric!

[nike123]

From my quick calculation you need 90 kW for fresh air and 35 kW for heat generated by peoples for 120 peoples and outdoor highest 35°C. I did not added here building transmission heat gain.