Device and method for measuring ice block surface convective heat transfer coefficient

Abstract

The invention provides a device and a method for measuring the ice block surface convective heat transfer coefficient. The device comprises an industrial camera (1), a computer (2), a data collecting instrument (3), an electronic micromanometer (4) and a fluid conveying and distribution system (5), wherein the fluid conveying and distribution system (5) comprises a test section pipeline (6), an air passage (7), an air valve (8), a hole plate flow rate meter (9), a fan (10), an electric heating device (11), a first thermal resistance temperature indicator (12), a second thermal resistance temperature indicator (13) and a temperature control cabinet (14). The method has the advantages that a non-contact measuring method is used; embedding is not needed; no damage is caused on an ice block; simplicity and repeatability are realized; the combined work by a refrigerating machine is not needed; the primary investment and the system complexity are reduced; the effect of the sensible heat change on the whole heat exchange can be achieved; the non-contact method is used for measuring the ice block surface convective heat transfer coefficient; the original air temperature field and the flow rate field are not damaged; the measuring precision is improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning and refrigeration, and in particular relates to a device and method for measuring convective heat transfer coefficient on the surface of ice cubes. Background technique [0002] With the rapid development of the economy and the continuous improvement of people's living standards, the society's demand for fresh, high-quality and frozen processed food is increasing. In the field of air conditioning and refrigeration, ice cubes are often used to cool the temperature of the surrounding air to ensure food safety. Controlling the amount of cooling released by ice cubes is the key to ensuring food safety, and obtaining the convective heat transfer coefficient on the surface of ice cubes is a necessary condition for calculating the amount of cooling released. [0003] The methods of measuring the cooling capacity of ice cubes can be divided into two categories according to whether the measuring ...

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Problems solved by technology

Du Yanxia of PLA University of Science and Technology published a paper "Experimental Research on the Influence of Natural Convection in the Melting Process" in "Experimental Fluid Mechanics", and constructed a non-contact measurement method based on the measurement method of the heat transfer coefficient of ice cubes inside a closed cavity, but this method ignores sensible heat change, and this method is only applicable when the flow state of the external flow field is natural convection

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