Superheat degree measurement method and device

Abstract

The invention relates to a superheat degree measurement method implemented based on the seebeck effect. The method comprises the steps that firstly, the input end and the output end of an evaporator pipeline in a refrigerating cycle are connected into electrodes, and therefore the electrodes and the evaporator pipeline make tight contact and form a loop, wherein the electrodes are made of materials which contain metal materials and are different from the materials of the evaporator pipeline; then the electromotive force between the electrodes is measured; finally, the measured electromotive force is converted into temperature difference on the basis of the seebeck effect. The invention further relates to a superheat degree measurement device. The superheat degree measurement device comprises the two electrodes and an electromotive force measurer, wherein the two electrodes are made of materials which contain the metal materials and are different from the materials of the evaporator pipeline in the refrigerating cycle. The two electrodes are connected to the input end and the output end of the evaporator pipeline respectively, and therefore the electrodes and the evaporator pipeline make tight contact to form the loop. The electromotive force measurer is connected with the two electrodes. The superheat degree measurement method and device are achieved based on the seebeck effect, the superheat degree of the refrigerating cycle is achieved with high precision and reliability, and the cost can be significantly reduced.

Description

technical field [0001] The invention relates to a method and a device for measuring the difference between the superheat temperature and the saturation temperature of a refrigerant in a refrigeration cycle. Background technique [0002] The degree of superheat refers to the difference between the superheat temperature and the saturation temperature of the refrigerant under the same evaporation pressure in the refrigeration cycle, which is an important parameter for the control of the refrigeration system. In common refrigeration control systems, the approximate value of superheat is usually obtained by measuring the temperature difference between the inlet and outlet of the evaporator. Such a measurement method needs to install a temperature sensor at the outlet and inlet of the evaporator, so there are the following disadvantages: [0003] 1. Two temperature sensors and two temperature measuring circuits are required, and the cost is relatively high. [0004] 2. The tempe...

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Problems solved by technology

[0003] 1. Two temperature sensors and two temperature measuring circuits are required, and the cost is relatively high

[0004] 2. The temperature sensor needs to be in close thermal contact with the inlet and outlet of the evaporator (usually a round copper tube that vibrates during operation), so it is difficult to install, and it will also loosen due to vibration and corrosion during long-term work , resulting in measurement error, the reliability is not high

[0005] 3. In the traditional measurement method, because the temperature difference is calculated by subtracting two temperatures, the errors of the two temperature sensors and their temperature measurement circuits will accumulate, resulting in a large error

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