I want to calculate the temperature of the oil cooler after heat exchange, but I don’t have the necessary data and don’t know how to do it
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There was originally a stainless steel shell-and-tube heat exchanger with a heat exchange area of 41㎡. Now it’s been changed to a copper tube heat exchanger, with a heat exchange area of 39㎡. The cooling water flows through the tube side, while the lubricating oil flows through the shell side. The inlet temperature of the cooling water is 16℃, and that of the lubricating oil is 90℃. Are there any other data needed? It seems like there are quite a few missing pieces of information Required oil cooling outlet temperature? How do I calculate it?
Flow area in the shell and tube sides, fluid flow rate, density, and viscosity.
With this software, you’ll get all the data you need: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1003595&extra=page%3D1
With this software, you’ll get all the data you need: https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1003595&extra=page%3D1
But you only provide red copper and area; there is no information on other geometric data. For example, the specifications of the heat exchange tubes, the tube center distance, the arrangement pattern of the tubes, the tube length, the shell diameter... are not provided at all; how can anyone know what your heat exchanger looks like?
It is a horizontal shell-and-tube heat exchanger of the type with baffle plates in between. Now, copper tubes have been used instead, with a diameter of Φ16×1, and the heat exchange area is 39㎡. When stainless steel tubes were used previously, the inlet temperature of the cooling water was 16℃ and the outlet temperature was 40℃; the inlet temperature of the oil was 90℃ and the outlet temperature was 82℃. For ordinary lubricating oils, what temperature can the oil be cooled to under the same operating conditions now that copper tubes are being used? How do I calculate it?
If previously a stainless steel heat exchanger with a surface area of 40 square units was used, and now a copper heat exchanger with a surface area of 39 square units is used, and the operating conditions remain unchanged, then the heat transfer coefficient of the copper heat exchanger will be much higher.
If there is a detailed structure of the heat exchanger, it can be calculated by inputting it into HTRI or other calculation software. If there are no changes compared to the design mentioned above, using copper pipes should provide a 5-10% higher design margin. So the difference in outlet temperature should not be significant.