A shell and tube heat exchanger, a heat exchanger group and a heat pump unit

Abstract

The invention discloses a shell-and-tube type heat exchanger, which comprises an auxiliary heat-exchanging cabin, a buffering cabin and a main heat-exchanging cabin, wherein the auxiliary heat-exchanging cabin, the buffering cabin and the main heat-exchanging cabin are sequentially connected; the main heat-exchanging cabin comprises a shell tube and a main heat-exchanging tube bundle, wherein the main heat-exchanging tube bundle is arranged in the shell tube, one end of the main heat-exchanging tube bundle is communicated with the buffering cabin, the other end of the main heat-exchanging tube bundle is communicated with a refrigerant discharging tube, the diameter of the shell tube is 200mm to 400mm, the diameter of a main heat-exchanging tube is 7mm to 11mm, the length of the shell tube and the main heat-exchanging tube is not shorter than 4000mm, and the equivalent heat-exchanging area of the shell tube is two to three times that of the main heat-exchanging tube bundle; a capillary bundle is arranged in the auxiliary heat-exchanging cabin, and the equivalent sectional area of the capillary bundle is greater than that of the main heat-exchanging tube bundle; the buffering cabin comprises a buffering cabin shell, and a buffering inner cavity is enclosed by the buffering cabin shell; the main heat-exchanging cabin is provided with a main water-inlet tube and a main water-outlet tube, and the auxiliary heat-exchanging cabin is provided with a water absorbing tube and an auxiliary water-outlet tube. The invention also discloses a heat exchanger set and a heat pump unit. The shell-and-tube type heat exchanger and the heat exchanger set as well as the heat pump unit have high heat-transfer coefficients.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to a shell-and-tube heat exchanger, a heat exchanger group and a heat pump unit. Background technique [0002] A heat exchanger is a device that transfers heat from a hot fluid to a cold fluid through the principles of convective heat transfer and heat conduction. Heat exchangers are widely used in chemical, petroleum, power and food industries. Among them, the shell-and-tube heat exchanger is a relatively commonly used heat exchanger. In the shell side of the shell-and-tube heat exchanger, refrigerant water flows, and in the tube side, refrigerant flows. The heat transfer coefficient is an important index of the heat exchanger, and the diameter and length of the shell side and the tube side of the heat exchanger are one of the important factors affecting the heat exchanger. The diameter determines the state of the fluid, and its length determines the heat absorption of the fl...

AI Technical Summary

Problems solved by technology

Due to the unreasonable configuration ratio of the length and diameter of the tube side and the shell side of the existing shell and tube heat exchanger, the heat transfer coefficient is affected. In addition, the existing heat exchanger directly connects the liquid (gas supply) nozzle to the The tube sheet of the heat exchange tube in the quasi-heat exchanger is connected to the heat exchange tube through the tube sheet for evaporation or condensation. Due to the limitation of the process size in the manufacturing process, the distance between the liquid supply tube and the tube sheet is very short, resulting in the refrigerant liquid After entering the heat exchanger, the refrigerant will churn and vortex, making the refrigerant entering the tube side uneven, and will also affect the heat transfer coefficient, so that the heat transfer coefficient of the existing heat exchanger is generally 3000-5000W / m 2 .K, up to 6000-8000W / m 2 .K, but no heat transfer coefficient can reach 10000W / m 2 .K shell and tube heat exchanger

[0003] In addition, the existing heat exchangers are generally single-unit heat exchangers, and when such single-unit heat exchangers are used in heat pumps as air conditioners for building units, they must be fully put into operation or completely stopped during operation. It cannot be adjusted according to the environment of the air conditioner and the actual usage as the season changes

For example, in early winter or early summer, the demand for air conditioning adjustment is low, and the redundant capacity of the heat pump is large, resulting in excess energy supply, resulting in waste; while in the dog days or cold winter, due to the high demand for air conditioning adjustment, the heat pump will appear energy supply again. insufficient

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