Control method for two-work-condition evaporator

Abstract

The invention relates to a control method for a two-work-condition evaporator. Cold fluid of the two-work-condition evaporator passes through tubes and involves two cold fluid inlets and one cold fluid outlet. Cold refrigerants pass through a shell and involve one refrigerant inlet and one refrigerant outlet. When the temperature difference of the inlets and outlet of the cold fluid is within the designed temperature different range of the evaporator, the cold fluid involves one inlet and one outlet and passes through two tubes. When the temperature difference of the inlets and outlet of the cold fluid is smaller than the designed temperature difference of the evaporator, under the condition that the heat exchange amount of the evaporator is not changed, the flow amount of the cold fluid needing to pass through the evaporator is increased, the cold fluids involves two inlets and one outlet and passes through one tube. According to the control method for the two-work-condition evaporator, the change of the work conditions of the cold fluid can result in the change of the flow amount of the cold fluid; and when the flow amount is doubled, the resistance of the evaporator does not change too much, the pump consumption is not increased, the heat exchange amount of the evaporator meets the design requirement all the time, and adjustment is convenient and reliable.

Description

technical field [0001] The invention relates to a method for controlling an evaporator with dual working conditions, and belongs to the technical field of evaporators. Background technique [0002] In the traditional evaporator, the cold fluid goes through the tube side, one cold fluid inlet and one cold fluid outlet; the refrigerant goes through the shell side, one refrigerant inlet and one refrigerant outlet. When the temperature difference between the inlet and outlet of the cold fluid is within the design temperature range of the evaporator, the flow rate of the cold fluid meets the design conditions, and the cold fluid goes through the double tube pass. When the temperature difference between the inlet and outlet of the cold fluid is smaller than the design temperature difference of the evaporator, and the heat exchange rate of the evaporator remains unchanged, the flow of the cold fluid that needs to pass through the evaporator increases. When the flow is doubled, if y...

AI Technical Summary

Problems solved by technology

When the temperature difference between the inlet and outlet of the cold fluid is smaller than the design temperature difference of the evaporator, and the heat exchange rate of the evaporator remains unchanged, the flow of the cold fluid that needs to pass through the evaporator increases. When the flow is doubled, if you continue to use the double tube, The resistance of the evaporator will be very large, the pump consumption will increase, and the flow rate of the cold fluid will hardly meet the heat exchange requirements, and the heat exchange effect will not meet the requirements

In traditional evaporators, the flow rate and temperature difference of the cold fluid can only be operated within the design range of the evaporator. With the change of the working conditions of the cold fluid, when the flow rate is doubled, the resistance of the evaporator will be very large, and the pump consumption will increase. The heat transfer capacity of the evaporator will also change accordingly, which may not meet the design requirements and is inconvenient to adjust

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