Self-adaptive dynamic cold load regulation and control method for central air conditioning system

Abstract

The invention provides a self-adaptive dynamic cold load regulation and control method for a central air conditioning system. The method is used in the central air conditioning system to achieve the quantity control according to the change of the dynamic cold load. The method is characterized in that variable temperature differential operation is realized in an active voltage differential change and flow change mode according to the outdoor temperature, the cold load of the central air conditioning system is divided into two parts, one part of the cold load of the central air conditioning system is a steady-state cold load related to the outdoor temperature, the other part is the uncertain dynamic cold load caused by the number of people, solar radiation and indoor free heat, and the variable temperature difference adopting the active voltage differential change and flow change mode is changed along with the steady-state cold load; and the dynamic cold load is followed by passive temperature difference change, so that the demand for cooling according to requirements can be effectively met, and the electricity-saving operation of a central air conditioner is realized.

Description

technical field [0001] The invention belongs to the field of automatic regulation of heating, ventilating and air-conditioning, and relates to the on-demand cooling regulation for central air-conditioning systems, in particular to an adaptive dynamic cooling load regulation method for central air-conditioning systems. Background technique [0002] There are a large number of central air-conditioning equipment in use in my country, most of which do not have cooling load control devices, and a small number of central air-conditioning systems use constant temperature difference or constant pressure difference methods to control the cooling load. The constant temperature difference control adopts the fixed temperature difference method to control the cooling load by passively following the temperature difference of the cooling network. In the case of partial load operation, the constant temperature difference method reduces the total flow rate, and it is difficult to meet the ne...

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Problems solved by technology

The constant temperature difference and constant pressure difference control methods are not directly related to the outdoor temperature when they are regulated, but the control action is made after the outdoor temperature affects the room temperature, resulting in a lag in the control effect

In addition, the fan coil at the end of the central air conditioner usually uses an electric two-way valve to adjust the flow, but most of the fan coils have not been maintained for a long time, and a considerable part of the fan coil electric two-way valve is damaged, resulting in the inability to realize the passive cold water flow of the circulating pump Control is also the reason why regulation cannot be achieved

Therefore, it is difficult for the central air-conditioning system operating under the condition of non-metering and charging to appear in the operating condition of behavioral energy saving

[0003] It can be seen from the above that the constant temperature difference can regulate the cooling load, but in the case of partial cooling load, it is difficult to meet the needs of different cooling load users; the constant pressure difference method needs a reasonable constant pressure point and user behavior energy-saving cooperation to obtain good energy-saving effect , so the constant temperature difference and constant pressure difference are not easy to use in practice. At present, most central air conditioners still operate under the working conditions of manually adjusting the temperature supply and flow rate based on experience, which is a waste of electric energy.

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