I am using three passes for the heat exchanger. The water flows due to gravity. The tube carries hot water and the shell, cold water. The type of flow is counter flow. The hot stream loses heat to the cold stream twice, as the length is limited and i want to ensure that maximum amt of heat is transferred. The problem is, i don't want the reverse to happen, in case the cold stream is already hotter than the hot stream at exit of the first pass. How do i determine the temperature of the streams at the outlet, for a given mass flow rate, length and dia of pipes, specific heats of the pipe material?? The tubes are horizontally placed, with an inlet on the top and outlet at the bottom.
When the entering cold stream is colder rthen the hot stream, you have absolutely no possiblity of ever getting it hotter than the hot stream with a heat exchanger. Apparently you haven't understood the concept yet.
understand the flow arrgt graph.
