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mechman
23-01-2014, 07:44 PM
hi oaks
Could danfoss dircalc software be use to do pipe sizing for network of rooms and evaporators? Did you done that before?

Peter_1
24-01-2014, 09:41 AM
Sure it can, you only have to select NH3 and make sure your inputs are correct. The result is only as good as your inputs are good.

mechman
02-02-2014, 06:24 PM
thks Peter
do you simulate the network of evaporators by adding up the individual capacities of evaporators on applicable branch line?

Peter_1
02-02-2014, 08:04 PM
Indeed, select the network for each evaporator with Dircalc and each time you connect those to the main suction and liquid line, the capacity of the main lines increases each time with the capacity you just added with a single evaporator.
Finally, when adding the last evaporator, m¨ost close to the compressor, you will have max capacity through the lines.
I should select the main line for max 80% total evaporator capacity so that at part load you still have sufficient speed.
We always select with a pressure drop equal to 1 K over the suction line.