Ask for help on the relationship between pressure drop and baffle spacing of tube coolers
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This post was last edited by Qieting-Fengyin on 2019-5-30 22:10. For a lubricating oil cooler of our company, the customer reported that the pressure difference between the inlet and outlet oil pressure was too large. The oil inlet pressure on the shell side is 0.5Mpa, the oil outlet pressure is only 0.35Mpa, and the pressure difference reaches 0.15Mpa. As a result, the flow rate of lubricating oil cannot meet the equipment requirements. This cooler is a GLC horizontal type, with a shell diameter of 426mm and a length of 2500mm. The size of the shell-side oil inlet and outlet is 159mm, and the heat dissipation pipe is an externally threaded copper pipe with an outer diameter of 14cm, and the spacing is 18cm in a regular triangle distribution. There are 17 equally spaced single-bow baffles. I would like to ask if there are too many baffles, causing the pressure drop to be too large. Is the spacing 18 suitable? The customer requires that the pressure difference cannot be greater than 0.05Mpa. How many baffles should be installed?
No way? ? ? Is the gasket opening too small during installation? Are there any resistance issues related to valves and oil lines? ? For example, the valve core falls off, the gasket opening is too small, the gasket is biased, the filter is blocked,,,,,. No matter how many baffles there are, as long as the oil passing cross-sectional area is larger than the area of the inlet and outlet oil pipes, there will not be such a large resistance. It is recommended to start by checking the oil lines of the entire system. Oh well, oil leakage is also a factor. Believe in yourself.
Other causes have been checked out, and the filter element and everything have been replaced with new ones, and the problem is still the same. Later, the customer replaced the original old cooler and the pressure difference was only 0.06Mpa. Then it was determined that it was a new cooler pressure drop problem.
This post was last edited by wiseboy on 2019-5-31 11:55. A principled discussion is meaningless for engineering. Principles are not specific data, but there are many influencing factors, and various factors need to be weighed. you should give: 1. Lubricating oil: quantity, inlet and outlet temperature requirements ； 2. Cooling medium (water): Inlet temperature, outlet temperature (optional) Then we can make scientific design for you. If you ask a general question like this, others will tell you many answers.: They all make sense and are not specific data.
This post was last edited by wiseboy on 2019-5-31 11:37. This is a similar heat exchanger I designed for a certain company in PetroChina, for reference only. It should be similar to yours, except that the amount and temperature of the lubricant may be different. Heat exchanger data are readily available.