An Experimental Method for Measuring Jet Entrainment by Monitoring Tracer Gas Concentration Value

Abstract

The invention relates to an experimental method for monitoring a tracer gas concentration value and measuring jet entrainment amount. An experiment device is set up, under the conditions that the jet flow temperature and indoor temperature are known, the concentration value of tracer gas flowing in a control body and the concentration value of the tracer gas flowing out of the control body are measured, and entrainment amount of jet flow in the control body on peripheral air can be calculated. SF6 is adopted as the detection tracer gas, is non-poisonous and harmless, and avoids influence on testing precision, and a reducing valve and a float flowmeter are used for adjusting the feeding speed of the tracer gas so that the tracer gas can be adaptive to different work conditions; according to the fluid dynamic theory, monitoring points are distributed at the axis of a jet flow track and hung on flexible wires, and measuring rods are prevented from being arranged to interfere the flow field; multipoint synchronous sampling is carried out, detection is accurate and scientific, stability is high, data are automatically recorded and stored through a computer, operation is convenient, and detection efficiency is high. The experimental method for measuring the jet entrainment amount is novel, and easy to realize and operate.

Description

technical field [0001] The invention relates to an air-conditioning system design optimization, in particular to an experimental method for monitoring the tracer gas concentration value and measuring the jet entrainment volume. Background technique [0002] With the progress and development of science and technology, there are more and more large-space buildings such as exhibition halls, theaters, and gymnasiums. The ensuing problems are the design, energy saving and optimization of the air-conditioning system in large-space buildings. Nowadays, layered air-conditioning systems are usually used in large-space buildings, which divide the interior space into an upper non-air-conditioned area and a lower air-conditioned area, and only adopt air supply air conditioning for the lower air-conditioned area, so as to achieve the purpose of energy saving. This would cause a large temperature difference between the upper non-conditioned zone and the lower conditioned zone, equating t...

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Problems solved by technology

[0003] The present invention aims at the problem that the traditional multi-section and multi-measuring point speed measurement method has a huge workload for testing the jet entrainment volume, and the problem that the experimental results have large deviations, proposes an experimental method for measuring the jet entrainment volume by monitoring the tracer gas concentration value , a novel, easy-to-implement and operate experimental method for determining the amount of air entrained by the nozzle jet on the surrounding environment

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