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What Causes The Heat Exchanger's Heat Transfer Efficiency?
- Aug 18, 2017 -

What causes the Heat Exchanger's heat transfer efficiency?
   The Heat Exchanger has the advantage of high heat transfer efficiency when used, but it may be affected by various reasons in the actual use of the Heat Exchanger, resulting in the decrease of the heat transfer efficiency. Let me analyze the Heat Exchanger What are the reasons that affect the heat transfer efficiency of Heat Exchangers?
  Two reasons for determining the efficient operation of the device:
  1, the Heat Exchanger machine itself factors: the majority of users in the purchase of Heat Exchangers, only to provide manufacturers with heat transfer area, generally no heat transfer quantity, fluid flow, import and export temperature and other more specific parameters, so It will happen to buy the plate Heat Exchanger heat transfer area is matched, but other processes are not the same as the problem, resulting in Heat Exchanger heat transfer efficiency is low, even on this basis to increase the heat transfer surface no effect.
   2, the system configuration factors: plate Heat Exchanger is only used as a heat conversion machine, in accordance with the energy conservation rules, simply is the heat medium side of the heat dissipation is absorbed by the cold medium, in many cases, Heat side of the heat generated by the heat can not be cold side of the cooling water absorbed, there is the medium flow is insufficient, the water temperature is not high enough, it will make the heat medium side temperature is high, that is due to this factor, resulting in The volume of the plate Heat Exchanger is too large to achieve a fixed efficiency.
Understand that the above will make the Heat Exchanger running performance reasons, you can in the future maintenance and maintenance of the above two aspects as the main problem to do some measures. It can greatly improve the operation of the machine performance.
 Heat Exchanger heating temperature can not meet the requirements: the main feature is the export temperature is low, fail to meet the design requirements. The main part of the leakage is the seal between the plate and the plate, the two seals of the plate and the end plate and the inside of the compression plate. Pressure drop: medium into the export pressure drop more than the design requirements, or even higher than the design value many times, seriously affecting the system on the flow and temperature requirements. In the heating system, if the hot side of the pressure drop is too large, the primary side of the flow will be seriously inadequate, that is, heat is not enough, resulting in the secondary side of the temperature can not meet the requirements. String: The main feature of the pressure on the higher side of the medium into the lower pressure side of the medium, the system will appear pressure and temperature anomalies. If the media is corrosive, it may also cause corrosion of other equipment in the pipeline. The string of liquid usually occurs in the diversion area or in the two sealed areas.
   The fracture of the weld in the Heat Exchanger is mainly under the microstructure, and the cracking at the inlet end is mainly brittle cracking. The crack is cracked at the tip of the toothed plate. The crack is cracked along the crystal. The main morphological features are cleavage and secondary cracking. Characteristics. There is a temperature difference between the pressing plate and the plate bundle. If the temperature difference is 100e, the temperature difference stress produced on the pressing plate is greater than the standard yield strength of the 304 material. In addition, the original structure of the tube plate thickness of 60mm, the outer edge of the tube plate by the shell diameter limit.
  The main surface features of the welds at the inlet end of the Heat Exchanger are brittle fracture, and the main morphological features are the characteristics of the secondary cracking and the stress corrosion cracking. The fracture of the toothed groove of the outlet tooth is mainly characterized by the ductile fracture, which is due to the large residual stress and thermal stress of the weld at the outlet end. The chloride ion stress and the high temperature The
The upper housing of the Heat Exchanger is provided with a hole for checking the upper expansion of the bundle. When removing the tube bundle, it can be disconnected from the lower end of the upper expansion joint, and the upper case and the expansion joint are disassembled separately.