KR-20260067784-A - MULTI STAGE EVAPORATOR

Abstract

A multi-stage evaporator according to one aspect of the present invention may include a tank communicating with an inlet pipe, a plurality of trays spaced apart from each other in multiple stages and disposed inside the tank, a working fluid flowing out from the inlet pipe and contained in the trays, and a plurality of heat transfer tubes disposed inside the trays and submerged in the working fluid.

Inventors

• 김진섭
• 김우경
• 김정철
• 신동환

Assignees

• 한국기계연구원

Dates

Publication Date

20260513

Application Date

20241106

Claims (15)

1. Tank connected to the inlet pipe; A tray consisting of multiple units and spaced apart from one another in multiple stages and arranged inside the tank; A working fluid that flows out of the inlet pipe and is contained in the tray; and A heat transfer tube comprising a plurality of units, disposed inside the tray and submerged in the working fluid; A multistage evaporator characterized by including
2. In Article 1, A multi-stage evaporator characterized by further including a plurality of heat transfer fins disposed inside the tray and penetrating the heat transfer tube to be submerged in the working fluid.
3. In Article 1, A multi-stage evaporator characterized by the above trays being arranged in a zigzag pattern along a vertical direction parallel to each other.
4. In Article 1, The above working fluid is, It flows out from the above inlet pipe and is contained in the above tray placed at the top, and A multi-stage evaporator characterized by sequentially overflowing and flowing from the tray placed at the top to the tray placed at the bottom.
5. In Article 1, A multi-stage evaporator characterized in that one of the sides of the tray is lower in height than the other side.
6. In Article 5, A multi-stage evaporator characterized by having a blocking plate extended upwardly at the top of the remaining side.
7. In Article 2, The above working fluid is, A multi-stage evaporator characterized by being placed in the tray such that a part of the heat transfer tube or a part of the heat transfer fin is submerged.
8. In Article 2, A multi-stage evaporator characterized by further including an absorption portion disposed on the outer surface of the heat transfer tube or on the side of the heat transfer fin.
9. In Article 8, A multi-stage evaporator characterized in that the absorption portion comprises at least one of a porous coating layer, a mesh screen, and microgrooves.
10. In Article 9, The above microgrooves are, Formed on the side of the heat transfer fin along the vertical direction, A multi-stage evaporator characterized by being composed of multiple units spaced apart from each other along the horizontal direction.
11. In Article 9, The above microgrooves are, Formed on the outer surface of the heat transfer tube along the circumference of the heat transfer tube, A multi-stage evaporator characterized by being composed of multiple units and arranged spaced apart from each other along the length direction of the heat transfer tube.
12. In Article 1, A recovery line installed between the lower part of the tank and the inlet pipe; and A pump installed in the above recovery line to pump the working fluid collected at the bottom of the tank; A multistage evaporator characterized by further including
13. In Article 6, A multi-stage evaporator characterized by further including a plurality of baffles installed on the inner surface of the tank, spaced apart from each other along the vertical direction.
14. In Article 13, The side of the above baffle and the above tray is, A multi-stage evaporator characterized by being arranged along a diagonal direction, tilted at a certain angle and parallel to each other.
15. In Article 13, The bottom of the above baffle and the above blocking plate are, A multi-stage evaporator characterized by being arranged facing each other but spaced apart from one another to form a flow path.

Description

Multi-stage Evaporator The present invention relates to a multi-stage evaporator, and more specifically, to a multi-stage evaporator capable of efficiently evaporating a working fluid using a small amount of working fluid. The evaporator is a key component in turbo chillers, adsorption, and absorption heat pump systems that generates cold energy by evaporating the working fluid; improving the heat transfer performance of the evaporator can increase the overall system efficiency. In conventional flooded-type evaporators, the heat transfer tubes where heat transfer occurs are completely submerged in the working fluid; as heat transfer is carried out by natural convection, which has a low heat transfer coefficient, the evaporator's performance deteriorates. In addition, there is a disadvantage in that a large amount of working fluid must be filled to completely immerse the fin tube in the working fluid. FIG. 1 is a schematic diagram of a multi-stage evaporator according to a first embodiment of the present invention. Figure 2 is an enlarged view of the tray shown in Figure 1. Figure 3 is a plan view of the tray shown in Figure 1. FIG. 4 is a first embodiment of an absorbent portion disposed on a heat transfer fin shown in FIG. 2. FIG. 5 is an enlarged view of part A shown in FIG. 2, which is a first embodiment of an absorption portion disposed in a heat transfer tube. FIG. 6 is a second embodiment of an absorbent portion disposed on a heat transfer fin shown in FIG. 2. FIG. 7 is an enlarged view of part A shown in FIG. 2, which is a second embodiment of an absorption section disposed in a heat transfer tube. FIG. 8 is a third embodiment of an absorbent portion disposed on a heat transfer fin shown in FIG. 2. FIG. 9 is an enlarged view of part A shown in FIG. 2, which is a third embodiment of an absorption portion disposed in a heat transfer tube. FIG. 10 is a schematic diagram of a multistage evaporator according to a second embodiment of the present invention. Figure 11 is an enlarged view of part B shown in Figure 10. Figure 12 is an enlarged view of part C shown in Figure 11. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are to be illustrated and described in detail. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. The terms used in this invention are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this invention, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that in the accompanying drawings, identical components are indicated by the same reference numerals whenever possible. Furthermore, detailed descriptions of known functions and configurations that may obscure the essence of the present invention will be omitted. For the same reason, some components in the accompanying drawings may be exaggerated, omitted, or schematically depicted. Hereinafter, a multi-stage evaporator according to the first embodiment of the present invention will be described. FIG. 1 is a schematic diagram of a multi-stage evaporator according to a first embodiment of the present invention, FIG. 2 is an enlarged view of the tray shown in FIG. 1, and FIG. 3 is a plan view of the tray shown in FIG. 1. Referring to FIGS. 1 to 3, a multistage evaporator (100) may include a tank (110), a tray (120), a working fluid (130), a heat transfer tube (140), a heat transfer fin (150), and an absorption section (160). The tank (110) is in the form of a polyhedron such as a hollow cylinder or a cube, and the upper part of the tank (110) can be connected to an inlet pipe (111) and an outlet pipe (112). The tray (120) is a cuboid with an empty interior and an open top surface, and is positioned inside the tank (110) spaced apart from the inner surface of the tank (110), and can be fixed to the inner surface of the tank (110) via a known fixing member such as a bracket. The tray (120) is made up of multiple trays and is spaced apart from one another in multiple stages and placed inside the tank (110), and can be arranged in a zigzag pattern parallel to one another along the vertical direction. That is, the trays (120) facing each other in the vertical direction can be arranged sequentially by repeatedly moving i