Heat exchanger for horizontal-tube falling film evaporator

Abstract

The invention discloses a heat exchanger for a horizontal-tube falling film evaporator. The heat exchanger comprises a liquid distributor and a heat exchange tube group, wherein the heat exchange tubegroup comprises a tube plate and a plurality of parallelly arranged curved heat exchange tubes side by side; each curved heat exchange tube comprises a water inlet tube, a water outlet tube, a baffleplate and a partition plate; the curved heat exchange tubes are of hollow structures; the partition plate covers two curved sides of each curved heat exchange tube hermetically, the baffle plate is arranged in the hollow structure, and a plurality of limber holes are uniformly formed in the baffle plate; the longitudinal sections of the curved heat exchange tubes are symmetrical curved surfaces symmetrical about the longitudinal axis, and each symmetrical curved surface comprises n circles and (n-1) necks, wherein n is greater than or equal to 2; convex arcs of the circles and concave arcs ofthe necks are in tangential transitional connection; the central angle between concave points of the two concave arcs of the necks and the center of circle of each circle is alpha; and the circles and the necks of adjacent two curved heat exchange tubes in the heat exchange tube group are arranged in a staggered mode. The heat exchanger disclosed by the invention can guarantee the flowing stability of a refrigerant, and solves the problem of accumulation and current deflection of liquid films at the bottom of a round tube effectively.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a heat exchanger for a horizontal tube falling film evaporator. Background technique [0002] In recent years, horizontal tube falling film evaporators have been widely used in refrigeration systems. Compared with conventional dry and flooded evaporators, horizontal tube falling film evaporators have the following advantages: [0003] 1. Good heat transfer performance. [0004] 2. The amount of refrigerant filling is small (about 50% to 70% of the flooded type). [0005] 3. The oil return performance of the unit is good. [0006] However, most of the existing heat exchange tube structures for horizontal tube falling film evaporators are round tubes, and it is difficult to ensure the stability and uniformity of liquid flow in actual operation. Such as figure 1 As shown, on the one hand, due to the uneven distribution of the local liquid film surface of the circular tube, the li...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a heat exchanger for a horizontal tube falling film evaporator, which can ensure the stability of the refrigerant flow and effectively Solve the problems of liquid film accumulation and liquid film deflection at the bottom of the circular tube

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