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Winter-heating water circulating pump energy-saving control method

An energy-saving control and water circulation pump technology, applied in the field of electronics and control, can solve problems such as excessive heating, high temperature at the user end, energy waste, etc., and achieve the effect of large energy-saving space

Inactive Publication Date: 2007-11-14
上海联达节能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The power design of the pump is usually designed according to the coldest weather in history, and its operation results often lead to excessive heat supply and high temperature at the user end, resulting in unnecessary waste
Even if some boilers currently use frequency conversion control technology for heating, they only control the outlet water temperature of the main pipe, and perform manual adjustment of single temperature or PID adjustment. These methods cannot be combined with the actual outdoor temperature for reasonable adjustment, which will inevitably lead to energy waste.

Method used

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  • Winter-heating water circulating pump energy-saving control method
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Examples

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Effect test

Embodiment 1

[0018] Embodiment 1: The present invention is applied to the energy-saving control of the water supply circulation pump of the secondary network of the heat pump station in the residential area. The control structure diagram is shown in FIG. 1 . The outdoor temperature is divided into three temperature ranges, the high temperature range is above -5°C, the low temperature range is below -20°C, and the middle temperature range is between the two temperatures. The upper and lower limits of the pulse frequency of each temperature section need to be set separately. The upper and lower limits of the pulse frequency of the low temperature section are set to 50Hz and 30Hz respectively; Set as 40Hz and 25Hz, as shown in Figure 4. In this example, the PWM pulse width modulation method is adopted, and the corner frequency (35Hz) and corner delay (2 minutes) must be preset. (1) Two temperature sensors (6 and 7 in Figure 1) transmit the measured temperature of the outlet pipe and the retu...

Embodiment 2

[0019] Embodiment 2: Apply the present invention to the energy-saving control of boiler heating and hot water circulation in winter in large-scale industries, enterprises or institutions. In this example, the outdoor temperature is divided into three temperature ranges, the high temperature range is above -6°C, the low temperature range is below -22°C, and the middle temperature range is between the two temperatures. The upper and lower limits of the pulse frequency of each temperature section need to be set separately. The upper and lower limits of the pulse frequency of the low temperature section are set to 50Hz and 32Hz respectively; Set as 42Hz and 25Hz, as shown in Figure 4. In this example, the PWM pulse width modulation method is adopted, and the corner frequency (32Hz) and corner delay (2 minutes) must be preset. (1) Two temperature sensors (6 and 7 in Figure 1) transmit the measured temperature of the outlet pipe and the return pipe to the energy-saving control cabi...

Embodiment 3

[0020] Embodiment 3: Apply the present invention to the energy-saving control of the central air-conditioning hot water cycle with cooling and heating cycle in the intelligent building. In this example, the outdoor temperature is divided into three temperature ranges, the high temperature range is above -5°C, the low temperature range is below -20°C, and the middle temperature range is between the two temperatures. The upper and lower limits of the pulse frequency of each temperature section need to be set separately. The upper and lower limits of the pulse frequency of the low temperature section are set to 50Hz and 35Hz respectively; Set as 40Hz and 25Hz, as shown in Figure 4. In this example, the PWM pulse width modulation method is used, and the corner frequency (30 Hz) and corner delay (2 minutes) must be preset. (1) Two temperature sensors (6 and 7 in Figure 1) transmit the measured temperature of the outlet pipe and the return pipe to the energy-saving control cabinet ...

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Abstract

The invention belongs to the field of electronics and control technology, specifically relates to a control method for saving energy in water circulating pump in winter. Its specific steps are that preinstall turning frequency, turning delay, the minimum and maximum limit of different temperatures pulse frequency. According to the range of temperature between outlet pipe and return pipe the energy-saving control cabinet adopts the PID algorithm to adjust pump operation frequency, when the pump operating frequency is lower than the turning frequency and the break over delay, and then pump operation frequency will be adjusted to the temperature maximum pulse frequency, and maintain a maximum delay time; pump operation frequency is higher than turning frequency and then adjusting by PID regulator; If the pump operating frequency below the turning frequency after adjustment, returning to the steps at the beginning of re-operation; if operation frequency higher than the break over frequency, entered the PID regulator. The invention adopts pulse working to prevent the water pump electricity motor works in the lower frequency limit for long hours, which cause the pipeline freezing and frost cracking because the end of pipeline can't bear under lower temperature long time and couldn't achieve consumer need. To the PWM technology application, the heating temperature is able to adjust heating temperature real-time in accordance with outdoor free air temperature.

Description

technical field [0001] The invention belongs to the technical field of electronics and control, and in particular relates to an energy-saving control method for a heating water circulation pump in winter. Background technique [0002] At present, whether it is heating by waste heat in thermal power plants or heating by boilers, the hot water circulation pumps usually operate at power frequency, or multiple power frequency pumps operate in parallel. The power design of the pump is usually designed according to the coldest weather conditions in history, and the result of its operation often leads to excessive heat supply and high temperature at the user end, resulting in unnecessary waste. Even if some boilers currently use frequency conversion control technology for heating, they only control the outlet water temperature of the main pipe, and perform manual adjustment of single temperature or PID adjustment. These methods cannot be reasonably adjusted in combination with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24D3/02F24D19/10F04D15/00
Inventor 贾书洪刘钢杨国太
Owner 上海联达节能科技股份有限公司
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