Enthalpy control-based method and system for controlling energy conservation of air conditioner

An air conditioner and enthalpy value technology, which is applied in the field of air conditioner energy-saving control methods and systems based on enthalpy value control, can solve the problems of inconsistent cooling capacity, energy waste, system overshoot and undershoot, etc., and achieves direct control, high control efficiency, and improved Control level effects

Inactive Publication Date: 2010-12-22
CHONGQING TONGFANG SCI & TECH DEV
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AI Technical Summary

Problems solved by technology

Although the solution of this patent reduces the overshoot of the air conditioner to a certain extent, it cannot realize the control of the controlled environment or not participate in the regulation and control of the controlled environment, let alone realize the precise control of the controlled environment
Due to the inconsistency between the host load and the cooling capacity of the controlled environment, the system also has overshoot and undershoot situations, resulting in energy waste

Method used

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  • Enthalpy control-based method and system for controlling energy conservation of air conditioner
  • Enthalpy control-based method and system for controlling energy conservation of air conditioner
  • Enthalpy control-based method and system for controlling energy conservation of air conditioner

Examples

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specific Embodiment

[0040] The central air-conditioning system of a process workshop in a factory has three refrigeration hosts, 6 chilled water pumps, 6 cooling water pumps, 8 cooling tower fans, 13 fresh air fans and 13 return air fans at the controlled environment side. Process requirements Controlled ambient temperature and humidity: 26°C in summer, 60±5%; 22°C in winter, 60±5%. The main engine is dual-purpose and one standby, and the chilled water pump and cooling water pump are four-purpose and two-standby respectively.

[0041] Set 42, 4, and 4 temperature and humidity detection devices in the controlled environment, fresh air section and mixed air section respectively, and connect the central computer through the on-site PLC; the link between the central computer, sensors and the on-site PLC controller adopts CAN bus communication Way.

[0042] The central computer timely monitors the temperature and humidity changes in the air-mixing section, calculates the air enthalpy in the air-mixin...

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Abstract

The invention relates to an enthalpy control-based method and an enthalpy control-based system for controlling energy conservation of an air conditioner. The method comprises the following steps of: increasing and decreasing the load of an air-conditioning system according to the difference values and directions of an enthalpy of an air mixing section and a control target value; making a system operating strategy according to the load of a main unit of the air conditioner and the running state data of each point in the system, an optimal energy efficiency ratio curve of a refrigerating main unit and a principle that the air enthalpy of the air mixing section is close to the control target value so as to comprehensively adjust the chilled water of a central air-conditioning system, cooling water temperature, flow rate, controlled environment end fresh air, air return fan and main unit running load; and therefore, the sum of refrigeration/heat demand of each point and the supply amount of a central air conditioner are balanced.

Description

technical field [0001] The invention relates to the technical field of central air-conditioning energy-saving control, in particular to an air-conditioning energy-saving control method and system based on enthalpy value control. Background technique [0002] The current central air-conditioning control method adopts the cold water supply and return water temperature difference to calculate the host load to control, that is, the product of the cold water flow, the supply and return water temperature difference, and the specific pressure heat capacity of the supply and return water is used as the host load. The method can reflect the real-time load of the host computer, but cannot respond to the demand load of the controlled environment in real time. Because the water supply temperature and flow are the cooling capacity supplied by the host at this time and used in the next period, the return water temperature is the response of the load of the controlled environment in the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/02
Inventor 夏万峡叶正发
Owner CHONGQING TONGFANG SCI & TECH DEV
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