Air conditioner energy-saving optimization control method and device

• US 10,234,834 B2
• Filed: 08/31/2015
• Issued: 03/19/2019
• Est. Priority Date: 10/16/2014
• Status: Active Grant

• Current Assignee: Alliance Environmental Technology Limited
• Original Assignee: Alliance Environmental Technology Limited
• Inventors: Liu, Lizheng, Pan, Yan
• Primary Examiner(s): Cao, Chun
• Application Number:
  US14/840,058
• Publication Number:
  US 20160109145A1
• Time in Patent Office: 1,296 Days
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/46 Improving electric energy efficiency or saving
• CPC Class Codes: F24F 11/62 characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• CPC Class Codes: F24F 11/64 using pre-stored data
• CPC Class Codes: F24F 11/70 Control systems characterised by their outputs; Constructional details thereof
• CPC Class Codes: F24F 11/85 using variable-flow pumps
• CPC Class Codes: F24F 2110/00 Control inputs relating to air properties
• CPC Class Codes: F24F 2140/00 Control inputs relating to system states
• CPC Class Codes: F24F 2140/60 Energy consumption
• CPC Class Codes: G05B 13/041 in which a variable is automatically adjusted to optimise the performance

Abstract

The invention is applied to control technologies, and provides an air conditioner control method and device, including collecting and storing current operating parameters of chillers, chilled water pumps and condenser water pumps of an air-conditioning system according to preset period; determining energy consumption increment of the air-conditioning system under operating status of an operating parameter to be adjusted relative to that under current operating status according to the current operating parameters and the operating parameter to be adjusted inputted by a user; and adjusting operating status of the air-conditioning system according to the operating parameter to be adjusted when the energy consumption increment is less than zero. According to the method and device provided by the invention, the air conditioning system is adjusted according to operating parameter to be adjusted when the energy consumption increment is less than zero to implement energy saving, and the invention is easy to implement.

Claims

1. An air conditioner control method, the method comprises:

collecting and storing the current operating parameters of chillers, chilled water pumps and condenser water pumps of an air-conditioning system according to a preset period;

determining the energy consumption increment of the air-conditioning system under an operating status of an operating parameter to be adjusted relative to that under the current operating status according to the current operating parameters and the operating parameter to be adjusted that is inputted by a user; and

adjusting the operating status of the air-conditioning system according to the operating parameter to be adjusted when the energy consumption increment is less than zero;

wherein, the determining the energy consumption increment of the air-conditioning system under an operating status of an operating parameter to be adjusted relative to that under the current operating status according to the current operating parameters and the operating parameter to be adjusted that is inputted by a user comprises;

calculating the chiller efficiency, the chilled water pump efficiency and the condenser water pump efficiency increment under the current operating status according to the current operating parameters;

calculating the chiller efficiency, the chilled water pump efficiency and the condenser water pump efficiency increment under the operating parameter to be adjusted according to the operating parameter to be adjusted that is inputted by the user;

determining the chiller efficiency increment, the chilled water pump efficiency increment and the condenser water pump efficiency increment according to the chiller efficiency, the chilled water pump efficiency and the condenser water pump efficiency increment under the current operating status and the operating parameter to be adjusted; and

calculating and obtaining the energy consumption increment according to a formula DE_total=DE_chiller×

P_chiller+DE_CHWP×

P_CHWP+DE_CWP×

P_CWP, wherein DE_chiller is the chiller efficiency increment, P_chiller is the chiller power consumption, DE_CHWP is the chilled water pump efficiency increment, P_CHWP is the chilled water pump power consumption, DE_CWP is the condenser water pump efficiency increment, and P_CWP is the condenser water pump power consumption;

wherein the determining the chiller efficiency increment, the chilled water pump efficiency increment and the condenser water pump efficiency increment according to the chiller efficiency, the chilled water pump efficiency and the condenser water pump efficiency increment under the current operating status and the operating parameter to be adjusted comprises;

calculating the chiller efficiency increment using a formula, wherein is the chiller efficiency increment, is the chiller efficiency under the operating status, and is the chiller efficiency under the operating parameter to be adjusted;

calculating the chilled water pump efficiency increment using a formula, wherein is the chilled water pump efficiency increment, is the chilled water pump efficiency under the operating status, and is the chilled water pump efficiency under the operating parameter to be adjusted; and

calculating the condenser water pump efficiency increment using a formula, wherein is the condenser water pump efficiency increment, is the condenser water pump efficiency under the operating status, and is the condenser water pump efficiency under the operating parameter to be adjusted.

2. The method according to claim 1, wherein the collecting and storing the current operating parameters of chillers, chilled water pumps and condenser water pumps of an air-conditioning system according to a preset period comprises:

acquiring one or more parameters of the chiller power consumption, the chiller operating current and the quantity of chillers in operating, chilled water supply and return temperature, and cooling water supply and return temperature, and acquiring one or more parameters of the operating speeds, the power consumptions, the head pressures, the water flows and the operating quantities of the chilled water pumps and the condenser water pumps according to the preset period.

3. The method according to claim 1, wherein the chiller efficiency is

E_chiller=(a₁×

CWT′

³+a₂×

CWT′

²+a₃×

CWT′

+a₄)+(a₅×

% CL²+a₆×

% CL+a₇)+(a₈×

% CL²+a₉×

% CL+a₁₀)×

(CWT′

−

23),

wherein a₁˜

₁₀ are constants, CWT is an actual cooling water inlet temperature, CWT′

=CWT−

5−

(CWDT)+LMDT(5,1.5)−

LMDT(CWDT,1.5) is a corrected cooling water inlet temperature, CWDT is an actual cooling water inlet and outlet temperature difference,

4. The method according to claim 1, wherein the chilled water pump efficiency is E_CHWP=H_CHWP×

(b₁×

Q′

²+b₂×

Q′

+b₃), wherein b₁˜

b₃ are constants,

5. The method according to claim 1, wherein the chilled water pump efficiency is E_CWP=H_CWP×

(c₁×

Q″

²+c₂×

Q″

+c₃), wherein c₁˜

c₃ are constants,

6. The method according to claim 1, wherein the adjusting the operating status of the air-conditioning system according to the operating parameter to be adjusted when the energy consumption increment is less than zero comprises:

when the energy consumption increment is less than zero and the operating parameter to be adjusted is to close the chiller, judging whether the quantity of the chiller operating at current is one, and not performing a closing operation when the quantity is one, judging whether a chiller having an operating time less than a first preset time threshold exists when the quantity of the chiller is not one, and not performing the closing operation if the operating time is less than the first preset time threshold;

otherwise, performing the closing operation; and

when the energy consumption increment is less than zero and the operating parameter to be adjusted is to start the chiller, judging whether the closing time of the chiller to be started is less than a second preset time threshold, and not performing a starting operation if the closing time is less than the second preset time threshold;

otherwise, performing the starting operation.

7. The method according to claim 1, wherein the adjusting the operating status of the air-conditioning system according to the operating parameter to be adjusted when the energy consumption increment is less than zero comprises:

when the energy consumption increment is less than zero and the operating parameter to be adjusted is to accelerate the chilled water pump, judging whether the operating speed of the chilled water pump to be accelerated is greater than a first speed threshold, and not performing an acceleration operation if the operating speed is greater than the first speed threshold;

otherwise, performing the acceleration operation; and

when the energy consumption increment is less than zero and the operating parameter to be adjusted is to decelerate the chilled water pump, judging whether the operating speed of the chilled water pump to be decelerated is less than a second speed threshold, and not performing a deceleration operation if the operating speed is less than the second speed threshold;

otherwise, performing the deceleration operation.

8. The method according to claim 1, wherein the adjusting the operating status of the air-conditioning system according to the operating parameter to be adjusted when the energy consumption increment is less than zero comprises:

when the energy consumption increment is less than zero and the operating parameter to be adjusted is to accelerate the condenser water pump, judging whether the operating speed of the condenser water pump to be accelerated is greater than a first speed threshold, and not performing an acceleration operation if the operating speed is greater than the first speed threshold;

otherwise, performing the acceleration operation; and

when the energy consumption increment is less than zero and the operating parameter to be adjusted is to decelerate the condenser water pump, judging whether the operating speed of the condenser water pump to be decelerated is less than a second speed threshold, and not performing a deceleration operation if the operating speed is less than the second speed threshold;

otherwise, performing the deceleration operation.