Constant-pressure variable-frequency control method and device applied to hospital large-small parallel chilled water pump
A chilled water pump, frequency conversion control technology, applied in applications, heating and ventilation control systems, and control inputs involving air characteristics, etc., can solve problems such as pump surge, shorten pump life, increase pump energy consumption, and increase pump life. , The effect of reducing the energy consumption of the pump and avoiding the surge of the pump
Inactive Publication Date: 2017-07-28
SHENZHEN DAS INTELLITECH CO LTD
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Problems solved by technology
Whether the chilled water system can operate efficiently plays an important role in the energy consumption of the air-conditioning machine room. In the case of parallel connection of large and small water pumps in the traditional chilled water system, power frequency control frequency or flow control methods such as large and small water pumps are generally used, which will cause the pressure head of the water pump to increase. The phenomenon of loss or pump surge shortens the life of the pump and increases the energy consumption of the pump
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[0044] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.
[0045] see figure 1 , is a schematic flow chart of an isobaric frequency conversion control method applied to large and small parallel chilled water pumps in hospitals according to the present invention; the control method can be applied to the design and operation of large and small refrigeration hosts and large and small chilled water pump parallel systems of chilled water systems in hospital refrigeration stations. In the actual frequency conversion or variable operation, under the premise of keeping the delivery pressure heads of the large and small chilled water pumps equal, each of them delivers the chilled water flow according to the operating performance curve to meet the energy demand at the end of the air condi...
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The invention relates to a constant-pressure variable-frequency control method and device applied to a hospital large-small parallel chilled water pump. The method comprises the steps that S11, a linear relation between a pressing head of a large chilled water pump and flow and a linear relation between a pressing head of a small chilled water pump and the flow are obtained; S12, a flow relation of the large chilled water pump and the small chilled water pump is obtained; S13, the flow relation of the large chilled water pump and the small chilled water pump is adaptively adjusted so as to obtain a frequency relation of the small chilled water pump and the large chilled water pump; and S14, the frequency of the large chilled water pump is monitored in real time, and a control signal is output to adjust the frequency of the small chilled water pump according to the frequency relation of the small chilled water pump and the large chilled water pump. According to the constant-pressure variable-frequency control method and device applied to the hospital large-small parallel chilled water pump, the phenomenon of water pump pressing head losses or water pump surging is avoided, the water pump service life is prolonged, water pump energy consumption is reduced, and the aims of cooling on demand and energy saving are achieved.
Description
technical field [0001] The invention relates to the field of air conditioning, and more specifically relates to a method and device for isobaric frequency conversion control of large and small parallel chilled water pumps in hospitals. Background technique [0002] In 2014, the total energy consumption of buildings exceeded 1.25 billion tons of standard coal, accounting for 30% of the total energy consumption of the society. The energy consumption of central air-conditioning accounts for 65% of the total energy consumption of buildings, of which the energy consumption of refrigeration stations accounts for about 70% of the energy consumption of air-conditioning systems. Whether the chilled water system can operate efficiently plays an important role in the energy consumption of the air-conditioning machine room. In the case of parallel connection of large and small water pumps in the traditional chilled water system, power frequency control frequency or flow control methods ...
Claims
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IPC IPC(8): F24F11/00
CPCF24F11/30F24F11/85F24F2110/00F24F2140/12
Inventor 刚文杰薛雪颜承初孙雪
Owner SHENZHEN DAS INTELLITECH CO LTD