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Hi everybody! Would you please help me to understand the terms in the attached image? Thank you a lot.

Hi If you make a cut on the inner pipe of a double pipe heat exchanger or make a hole on it and attach a rectangular or a pin shaped fin on (in) it,(and of course, weld it) so that it is extended from inside of the pipe to it's outside,how would the fin effectiveness be changed? I wonder if in...

thread403-400808 Hi A garbage chute duct is simultaneously subject to positive and negative pressure at sections downstream and upstream of the garbage when it is falling down. So I think it is not a good idea to install the exhaust fan on the upper end of it. Generally speaking, a separate duct...

Hi everybody In rating a cooling tower, dry bulb temperature of air is not considered. On the other hand the ratio of latent to sensible heat transfer is dependent on it. If the thermal performance of a cooling tower is considered as the sum of its ability to sensible heat transfer and latent...

Hi every body If there is no need to have cooling and heating simultaneously and if there are control valves on air handling units ,is it enough to have just a single coil for both heating and cooling?

Hi In a reverse return heating system does it matter if the pump is installed on return or supply line just because it is a reverse return system?

Hi everybody This thread is interesting for me very much. Unfortunately I can't get Biginch's diagram.Any help please? thread407-199822

1 -Is there something like "pressure gradient" or "driving force gradient" in a thermosiphon system?If so,how is it drawn? 2 - Suppose a simple thermosiphon system of a heat source at bottom ,a sink at top and two risers.If there is another sink in the middle of source and sink how the system...

1- Is it possible to calculate the density of a solution (for example Li Br solution) from solvent's mass percentage? 2 - Where can I find a table or a chart for Li Br - water solution density?

Is there any rule for when to use blind flanges and when to use blind caps for headers (say parallel pumps headers)?

If we suppose the flow at the outlet of a water tank to be the discharge of a pump,and if we connect a pump to this outlet it is as if we have two pumps in series.In such arrangement we don't expect the flow rate to be increased specially if the system curve is near to flat.But in practice the...

Sorry for asking such a basic question! In a 6 floor car parking the design area consists of 12 sprinklers in 6th floor.Suppose the flow rate to be 240 g.p.m and the feed main pipe size to be 3".What will the flow rate for which the riser size will be calculated at lower floors?The same 240...