Analysis of the influence of the performance of the chiller due to the variable flow of the water side of the turbine flow meter

Abstract: Analysis of the influence of the performance of the chiller due to the variable flow of the water side of the turbine flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. The influence of the variable flow rate of the water side of the turbine flowmeter on the performance of the chiller The water flow sensor is mainly composed of a copper valve body, a water flow rotor assembly, a steady flow assembly and a Hall element. It is installed at the inlet end of the water heater to measure the inlet water flow. When water flows through the rotor assembly. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article analyzing the influence of the performance of the chiller due to the variable flow of the water side of the turbine flowmeter. The influence of the variable flow rate on the water side of the turbine flowmeter on the performance of the chiller The water flow sensor is mainly composed of a copper valve body, a water flow rotor assembly, a steady flow assembly and a Hall element. It is installed at the inlet end of the water heater to measure the inlet water flow. As water flows through the rotor assembly, the magnetic rotor rotates and the rotational speed varies linearly with flow. The Hall element outputs the corresponding pulse signal and feeds it back to the controller. The controller judges the water flow and adjusts the current of the proportional valve, so as to control the gas volume through the proportional valve to avoid the phenomenon of being warm in summer and cool in winter when the gas water heater is in use. . The water flow sensor fundamentally solves the shortcomings of high starting water pressure of the differential pressure water-air linkage valve and the easy malfunction of the flap-type water valve, such as dry burning. It has the advantages of sensitive response, long life, fast action, safe and reliable, convenient connection, etc., and is deeply loved by users. The water flow rotor assembly is mainly composed of turbine switch shell, magnetic rotor and brake ring. When using the water flow switch method, its performance is better than that of the mechanical differential pressure plate structure, and the size is significantly reduced. When the water flow passes through the turbine switch casing, it pushes the magnetic rotor to rotate. When the different magnetic poles are close to the Hall element, the Hall element is turned on, and the Hall element is turned off when it leaves. From this, the rotor speed can be measured. According to the measured water flow, rotor speed and output signal (voltage) curve, the starting water pressure of the water heater can be determined, as well as the starting water flow corresponding to the starting water pressure and the starting speed of the rotor. The control circuit can realize that the water heater starts to work when the rotor rotational speed is greater than the starting rotational speed; when the rotational speed is less than the starting rotational speed, the water heater stops working. In addition, because the water is cut by the magnetic field of the permanent magnet material, it becomes magnetized water, and the oxygen content in the water increases, which makes people feel refreshed after bathing. The function of the brake ring is to stop the high-speed rotating magnetic rotor from rotating and stop the pulse signal output when the water stops. If the controller cannot receive the pulse signal, it will immediately control the gas proportional valve to close the valve, cut off the gas source, and prevent dry burning. Influence of water-side variable flow on chiller performance In traditional air-conditioning water system design, the flow of chilled water and cooling water through the chiller remains basically unchanged. It is believed that the heat exchange effect of the coil can be ensured only by maintaining a constant flow rate. When the flow rate decreases, a laminar flow state may appear on the surface of the heat exchange coil, reducing the heat exchange effect. At the same time, if the flow rate is too small, the evaporator will freeze. Dangerous, when the flow rate is less than a certain value, if the water contains corrosive substances, it will cause corrosion to the coil. With the development of control technology, the control system of the chiller is becoming more and more advanced. At present, different types of chillers can automatically adjust the cooling capacity. The advancement of the energy regulation function of the chiller makes it possible to design the variable flow rate on the water side, and it also highlights that the water pump should be changed in order to adapt to the changes, but should be changed. In fact, at present, most chillers allow the evaporator flow to vary within 50% to 100% of the rated flow. When the evaporator operates with variable flow, its flow changes with the change of user load. When the user load becomes smaller, the chilled water flow of the evaporator becomes smaller, and the control system of the chiller reduces the refrigerant flow according to the actual cooling capacity. , causing the refrigerant flow rate in the evaporator coil to deviate from the optimal flow rate value, and the overall performance of the chiller refrigeration system is reduced. The criterion for measuring whether the variable flow of the evaporator can save energy is not only how much energy can be saved when the chilled water pump is running, but also the energy loss caused by the drop in the COP value of the chiller caused by the variable flow of the evaporator, and then consider the load time frequency of variable flow operation. Spend. Due to the advancement of control technology, the control system can ensure that the compressor is always running in the high-efficiency area, so that the performance of the chiller evaporator will not drop a lot when the flow rate is changed. The degree of influence of the variable flow of the chiller's evaporator on its cooling performance is related to the type of compressor and the way of variable flow of the refrigerant. This is analyzed from the perspective of thermodynamics, and it is considered that even if the chilled water flow is reduced to 60%, the COP of the chiller will not decrease by more than 10%. When the temperature difference between the inlet and outlet of the cooling water increases, although the operating cost of the cooling water pump can be reduced, in order to ensure the heat exchange in the condenser, the condensing temperature must be higher than the outlet temperature of the cooling water.And the condensing temperature and the cooling water outlet temperature also require a lower limit. Therefore, in order to increase the temperature difference between the inlet and outlet of the cooling water, it is necessary to increase the outlet temperature of the cooling water (usually the inlet temperature of the cooling water is basically a constant value), which in turn will cause an increase in the condensing temperature and reduce the COP value of the chiller. Compared with the variable flow rate of the evaporator, the variable flow operation of the condenser has a greater impact on the condensing temperature, so the COP of the chiller changes greatly. The impact of performance, determine the feasibility of the program. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of the influence of the performance of the chiller due to the variable flow rate of the water side of the turbine flow meter'

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