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I will clarify... Its an AHU serving one bellmouth per floor through 8 floors, each take off has a vcd, then I have a pitot traverse point drilled in the duct, then it goes out the supply bellmouth. Each floor is identical. When I say "index" I mean the branch recieving the lowest % of design...

I have been asked to balance a supply air system with 8 supply bell mouths. Normally this would be a simple balance. Each branch would be balanced by a duct traverse. However as well as a design airflow I have been given a requirement for a static pressure at the index branch. I have been...

mintjulep - im not sure if log mean temp difference is what i need? (what can this be used for anyway) and the fan coil has a counterflow heat exchanger sailcat 753 - yes i know what you have said above but my query is how do i work out the new DT of the water if the flow temp has changed from...

cheers

yes but cant seem to find a list in metric, all in inches. could convert but thought somebody might have it handy or know where to point me for it

I am looking for a list of standard pipe sizes wall thickness's in the range of 15mm to 200mm for carbon steel pipe, or other common pipe material used for heating/cooling water applications. It would be useful to know when using an ultrasonic flow meter. need wall thicknesses in mm

IRstuff - i am just looking for clarity on this as my knowledge is not extensive. sorry to drag this on in the equation you used above you got the ratio between a 70 deg water flow temp to heat air by 24 deg - to - an 80 deg water flow temp to heat air by 24 deg this was 79.3% so if the 100%...

ok that makes sense thank you. so if water flow temp drops from 82 to 70 and both flowrates across coil remain the same and outside temp remains same we know that Q and DT have both changed How do i work out what they have changed to? as i cannot use Q=mcDT is coil output directly proportional...

ok still not sure if air design conditions are as follows (example only) air flowrate = 0.3 m3/s outside air = -2, design supply air = 22 (air DT = 24 deg c) Heating requirement to do this 8.82kW Therefore fan coil unit heating coil size is 8.82kW, heating system has 11 deg c DT (82 flow, 71...

i have a question about delta t for heating coils in fan coil units it seems like a stupid question but anyway if a heating system is designed as 82deg c flow and 71 deg c return therefore an 11 deg c delta t. If all the coils in the system are also designed for 11 deg delta t at design flow...