Calculating Pipe Sizes for large Commerical Building

[mattywallace]

Hi im just looking for some help for pipe sizing one level of a commercial building

I have all the wattage requirements for all the radiators, along with flow rates.

What do i need to do next?

Many Thanks

 

[bellairaphon]

length of pipe, fittings. use the pipe sizing chart

 

[Onetap]

What do i need to do next?

Employ an engineer.

Alternatively, at a later date, employ a solicitor and he'll employ a barrister on your behalf.

Many Thanks

Don't mention it.

 

[D_Hailsham]

Read Copper Tubes in Domestic Heating Systems and SmallBore heating Systems.

They will give you an idea of the work involved.

 

[Biggles..]

First post,welcome along.

I presume this is a college thing and your not actually being employed to do this.(no disrespect but asking how to size a commercial circuit on a diy froum might be considered a bit weird)

You could look at it a few ways,calculate your heat output for the floor against any cooling factor that may be in place,calculate the required flow for the heat requirement and size pump from there(simpleist)

Factors to consider are pipework layout,one pipe,two pipe,reverse return,cicuit design is it CT or VT and how are you controlling the pump and cicuit, what efficiency do you want from your pump(modulating or fixed speed), pump duty(single head,dual head),what are your filling your system with(water,glycol,anti freeze).

DH's bboks will give you an understanding but wont cover some of the differences in the commercial world.

Good luck welcome to the mine field, watch how you tread.

Lee

 

[compheat]

I'm just in the process of finishing a large 7 storey office refurb, 35 rads per floor, total output 500kw. Boilers 3x 240 kw Buderas GB 320.
If you know the boiler output then thats where you start with what size pipe for the risers, low loss header etc. then theres the pump, expansion vessel air and dirt seperator and so it goes on

 

[Norcon]

Are gas boilers and radiators the way forward for the modern commercial office block?
I only ask as most of the office blocks I worked on had vrv heat pumps fitted. Natural gas being available!
One did have a boiler and rads but most of the engineers questioned the consultants "thinking" on having both systems.
The client on that particular job though was quite wealthy so perhaps it was his decision.
The office workers probably run the boiler and the vrv cooling at the same time. LOL

 

[Biggles..]

VRV heating/cooling depends on office block layout,ideal for large open plan but small sectonal office space ,individual heat/cool control is lost.
Space is normally at a premium and plant size a minimum therefore loads of heat units becomes a problem.

Most office redesign is radiators with some aspect of cooling for large areas for summer useage.

7floors 500kw would be about 6l/s flow,nothing unusual,but the height will cause issues,would have thought 7 floors is 30+ metres.

We would have split the design into 3 zones,1-3,4 and 5,6 and 7. Reverse return normally up and down either side of the lift shaft,commisioning valve and sets on each floor to balance the flow.

Lee

 

[Norcon]

vrv control works fine on small individual rooms. We did a few hotels.
Three pipe layout with bs boxes. Daikin system!
Up on the roof there's lots of space. Getting your tools to the top is the big problem.

 

[Biggles..]

Last one I did in the centre of Notts,planning refused permission for any roof mounted plant. The only space was basically above the lift shaft with the winding gear.
I spent too many days in a man rider for my liking on that job trying to run tray up the corner of the building.