Device for testing thermal performance and fluid resistance of liquid-liquid heat exchanger

Abstract

The invention discloses a device for testing thermal performance and fluid resistance of a liquid-liquid heat exchanger. The device is characterized in that a heat source medium container consists of a high-temperature container and a low-temperature container, which are arranged separately; heat source medium outlet pipelines of the high-temperature container and the low-temperature container are respectively connected with a heat source three-way regulating valve; a heat source variable frequency pump is arranged in the heat source medium outlet pipeline of the heat source three-way regulating valve; the outlet pipeline of the heat source variable frequency pump is connected to the heat source medium inlet of the tested heat exchanger; a steam heat exchanging unit is arranged in the heat source medium outlet pipeline of the tested heat exchanger; the heat source medium subjected to heat exchange in the tested heat exchanger is heated by the steam heat exchanging unit, and flows backto the high-temperature container; and an auxiliary electric heater is arranged in the high-temperature container. The device can realize fast detection and adjustment, effectively and stably controlthe temperature fluctuations of cooling and heat sources and reduce the error of a testing system.

Description

technical field [0001] The invention relates to a liquid-liquid heat exchanger thermal performance and fluid resistance testing device, more specifically for liquid-liquid heat exchangers (such as Shell-and-tube heat exchangers, plate heat exchangers, spiral plate heat exchangers, etc.) are test devices for thermal performance and fluid resistance testing. Background technique [0002] The energy saving of heat exchanger products is a key task in the energy saving work of high energy consumption special equipment, and the energy saving evaluation indicators are complex and difficult. The test device is mainly used for the detection of heat transfer performance and resistance drop of heat exchanger products. The determination of thermal performance and fluid resistance of heat exchangers provides an important basis for the development of high-efficiency and energy-saving products and the inspection of product quality characteristics. [0003] At present, industrial test dev...

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Problems solved by technology

[0005] 1. On the one hand, during the test process, since the hot side medium returns to the heat source medium storage tank after being cooled down by the test piece, the heat source medium storage tank is always mixed with the return medium, and the temperature adjustment cannot be realized, resulting in the system The temperature cannot be stabilized; on the other hand, the cold source medium cooling method of the open cooling tower makes the temperature of the cold source medium after passing through the cooling tower usually slightly higher than the local air wet bulb temperature. When the temperature changes, the temperature control cannot be performed; therefore, there are problems such as unstable test data at the working point, large test data error, and test data distortion.

[0006] 2. Once the temperature of the heat source medium is heated beyond the required test temperature, one way to cool down is to lower the temperature of the heat source medium through the test piece, and the other is natural cooling. These two ways waste energy and It is not conducive to the continuity of the test and prolongs the test cycle;

[0007] 3. In the existing system, the cold source medium is dissipated through the open cooling tower. If the open cooling tower cannot be used directly due to the particularity of the cold source medium, it is necessary to add an intermediate cooler or use an intermediate medium to cool down. The secondary heat transfer is increased, which increases the difficulty of temperature control of the cold source medium

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