Device for evaluating internal condensation characteristic of enhanced heat transfer pipe

Abstract

The invention relates to a device for evaluating internal condensation characteristic of an enhanced heat transfer pipe. The device mainly comprises a steam system, a test section, a cold water takingsystem and a data acquisition system, and can evaluate the local condensation heat transfer and pressure drop characteristics of various kinds of steam or mixed gas in different enhanced heat transfer pipes. The steam system comprises a boiler, a precooler, an air compressor, a gas storage tank, a dryer, a gas heater and a static mixer, and can provide pure-component and multi-component steam orair-containing mixed gas needed by the test. The test section comprises a straight pipe measuring section, a condensation section, a measuring section and an observation section which are connected with one another sequentially; an inlet is connected with the steam system; and an outlet is connected with a gas and liquid separator. The two ends of an outer sleeve pipe of each of the precooler andthe test section are connected with one set of water cooling system in parallel. The internal heat transfer coefficient of the enhanced pipe is acquired through a thermal resistance separation method,and basis is provided for thermodynamic design of an efficient pipe shell type condenser.

Description

technical field [0001] The invention relates to the field of performance testing of heat transfer elements of heat exchangers, in particular to a device for evaluating the condensation characteristics in enhanced heat transfer tubes. Background technique [0002] The condenser can obtain a higher heat transfer coefficient with a lower heat transfer temperature difference, and is the main equipment of the cooling system. Among them, the shell-and-tube condenser is the most widely used condensing equipment because of its easy manufacture, low production cost, wide range of material selection, convenient cleaning, and ability to adapt to high temperature and high pressure, and is in a leading position in petroleum, chemical and energy industries. . With the growth of the domestic economy, the contradiction between social development and energy shortage has become increasingly prominent. Therefore, efficient and compact heat exchange equipment is designed and manufactured, whet...

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Problems solved by technology

During the test, the temperature at the measuring point of the thermocouple cannot be used to deduce the inner wall temperature through the Fourier heat conduction law, so the local condensation heat transfer coefficient cannot be obtained

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