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Power-saving device of central air-conditioning

A power-saving device, central air-conditioning technology, applied in electrical program control, space heating and ventilation, program control in sequence/logic controllers, etc., can solve problems such as low load rate, waste of electric energy, etc. low effect

Active Publication Date: 2009-02-11
SHENZHEN SUNWIN INTELLIGENT CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0011] In order to solve the technical problem of waste of electric energy caused by the low load rate of the air conditioning system in the prior art, the present invention provides an energy-saving central air-conditioning power-conditioning device and an air-conditioning system

Method used

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  • Power-saving device of central air-conditioning

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Embodiment Construction

[0019] According to the theory of fluid mechanics, the output flow Q of most fluid transmission equipment (such as centrifugal pumps, fans, etc.) is proportional to its rotational speed n; the output pressure P (head) is proportional to the square of its rotational speed n; the output power N is proportional to its rotational speed n. It is proportional to the cube of , which can be expressed as:

[0020] Q=K1×n

[0021] P=K2×n2

[0022] N=Q×P=K3×n3 (K1, K2, K3 are proportional constants)

[0023] It can be seen from the above principle that the output power of the water pump can be reduced more by reducing the speed of the water pump. If the power supply frequency of the motor is reduced from 50Hz to 40Hz, theoretically, the ratio of the output power of the low frequency 40Hz to the high frequency 50Hz is (40 / 50)3=0.512.

[0024] Since the design temperature difference of the pipelines in the cooling water circulation system is usually 5 to 6°C, the actual application show...

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Abstract

The invention provides a power saving device used in a central air conditioner, which comprises a temperature detection unit for detecting the temperature of the water inlet and the water outlet of an air conditioning water circulation system; a frequency conversion processing unit for receiving frequency conversion signals and controlling the running frequency of a water pump motor in the water circulation system; a central processing unit for receiving, processing and sending signals which comprise the processes of receiving the temperature of the water inlet and water outlet obtained by the temperature detection unit, calculating the actual temperature difference of the water inlet and the water outlet, calculating a frequency conversion signal which regulates the actual temperature difference to the pre-determined temperature difference and outputs the frequency conversion signal to the frequency conversion processing unit when the actual temperature difference is less than the preset temperature difference. The power saving device can effectively save electric energy for the air conditioning system.

Description

technical field [0001] The present invention relates to air conditioning systems. Background technique [0002] The prior art central air conditioning system is mainly composed of three parts: a chilled water circulation system, a cooling water circulation system and a main engine. [0003] The chilled water circulation system consists of a chilled pump, an indoor fan and a chilled water pipeline. The low-temperature chilled water flowing out of the main engine evaporator is pressurized by the refrigeration pump and sent to the chilled water pipeline (outlet water), enters the room for heat exchange, takes away the heat in the room, and finally returns to the main engine evaporator (return water). The indoor fan is used to blow air through the chilled water pipe, reduce the air temperature and accelerate the indoor heat exchange. [0004] The cooling water circulation part is composed of cooling pump, cooling water pipeline, cooling water tower and condenser. The chilled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/02F24F11/053G05B19/04F24F11/76
Inventor 周勇卿济民商毛红崔岩
Owner SHENZHEN SUNWIN INTELLIGENT CO LTD
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