You could calculate the cost using this:
(cost of electricity)*(consumption)*(hours of operation/day)*(days of operation/year)=cost for one year
Note that power consumption is usually different in cooling and heating modes, so do the calculations for both and add them up.
If you divide the...
I need to supply a three-phase transformer that has a peak/starting power of 7kVA. Voltage supply im my country is 230V. If my calculations are correct, the starting current on each phase is 8.2A and I selected a 5*2.5mmm2 cable with a 3*10A fuse. Will that be ok? Thanks!
I agree with the pump selection. In any similar case, you add the flows needed and take the pressure of the last fixture of the circuit, or the fixture in the most disfavored position (by the means of pipe length, curves, orifices, etc). If you consider the equivalent electrical circuit, flow is...
You can use the following figures as a guideline:
People: 74 W/person sensible and 58 W/person latent
Lights: 2.5 W/ft2
Equipment: 1.0 W/ft2
Hope this is usefull.
The flow is way too big for the 10" pipe! You should increase the pipe diameter or connect a second 10" pipe in parallel with the existing one to distribute the flow. You will need a collector where the two pipes meet.
For the second case (1600 m3/h) you will need more than two parallel pipes...
Try using PVC or PP. If you do use stainless steel be sure to use plenty of sacrificial anodes. I find the following links very useful:
http://www.corrosionsource.com/discuss2/ubb/Forum43/HTML/000006.html
http://www.corrosion-doctors.org/MatSelect/rouging.htm...
