Method for determining water inlet speed of cooling water through convective heat transfer

Abstract

The invention belongs to the technical field of photovoltaic glass, and particularly relates to a method for determining the water inlet speed of cooling water through convective heat transfer, which comprises the following steps: firstly, accurately measuring the inner diameter and the length of a calender roll; measuring the water inlet temperature and the water outlet temperature of cooling water; measuring the temperature of the inner surface of the calender roll; measuring the inner diameter of the water inlet pipe orifice, and calculating the water inlet cross-sectional area according to an area formula; the measured parameters are substituted into a formula (I), and the water inlet speed v of the cooling water can be calculated. According to the method, the water inlet speed of the cooling water in the calendering roller can be accurately determined, the roller temperature of the calendered glass is accurately controlled, and the yield of the calendered glass is improved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic glass, and in particular relates to a method for determining the water inlet speed of cooling water through convective heat exchange. Background technique [0002] Photovoltaic glass is widely formed by calendering. During the forming process, the molten glass flows out of the furnace, and is cooled and formed after being pressed by the upper and lower calender rollers. The upper and lower calender rollers are all round tubes made of 2Cr13. The gap, through the rotation of the upper and lower calender rolls and the pressure of the upper calender roll, drives the molten glass to pass through the upper and lower calender rolls. In the process of passing through the gap between the upper and lower calender rolls, the molten glass is cooled by the calender rolls and gradually shaped. The temperature in front of the molten glass roll is as high as 1000°C. After the calender roll is cooled, the te...

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Problems solved by technology

[0003] In the actual production process, it is often difficult to accurately control the water intake of cooling water. The water intake speed is slow, and the surface temperature of the calender roll is too high, which will easily cause the glass to stick to the roll; the water intake speed is fast, and the calender roll surface temperature is too low, which will easily cause glass cracks Defects, therefore, it is very important to accurately determine the water intake rate of cooling water

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