Antifreeze system, shell-and-tube heat exchanger, charging amount calculation method, and antifreeze method

Abstract

The invention provides an anti-freezing system suitable for a shell-and-tube heat exchanger, the shell-and-tube heat exchanger, a charging amount calculation method and an anti-freezing method, relates to the technical field of heat exchangers, and solves the technical problem that the vicinity of a tube plate is easy to freeze when the shell-and-tube heat exchanger is in refrigeration operation in the prior art. The anti-freezing system suitable for the shell-and-tube heat exchanger comprises a condensation cavity, an evaporation assembly and a connecting assembly. The condensation cavity ishermetically communicated with the evaporation assembly through the connecting assembly to form a circulating system; the circulating system is filled with a heat exchange medium; and the condensationcavity is adjacent to the tube plate and can exchange heat with the tube plate. The heat exchange medium can release heat and be liquefied in the condensation cavity of the circulation system and absorbs heat and evaporates in the evaporation assembly, and the heat absorbed in the evaporation assembly is replaced into the condensation cavity adjacent to the tube plate, so that it is guaranteed that the tube expansion portion cannot be frozen, the expansion tube is not prone to damage, the problem of refrigerant leakage cannot be caused, and the operation reliability of the shell-and-tube heatexchanger is guaranteed.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to an antifreeze system, a shell-and-tube heat exchanger, a charging amount calculation method and an antifreeze method. Background technique [0002] Shell and tube heat exchangers are widely used in modular air-cooled cold (hot) water units due to their compact structure, good heat transfer performance, and easy cleaning. However, there are currently many single-module air-cooled cold (hot) water units. The internal leakage of the shell and tube occurs mainly because during cooling operation, if the inlet water temperature of the inlet pipe of the shell and tube heat exchanger is low, the evaporation temperature of the refrigerant in the copper tube is likely to be lower than 0°C, which will cause the expansion of the tube position of the shell and tube tube plate The water freezes and expands, squeezing the expansion tube (the expansion tube is to insert the copper tube i...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide an antifreeze system, a shell-and-tube heat exchanger, a charging amount calculation method, and an antifreeze method to solve the problem in the prior art that the shell-and-tube heat exchanger is easy to freeze near the tube sheet during cooling operation. technical problem

Images