CN103234256A - Dynamic load tracking central air conditioner cold source global optimum energy-saving control method - Google Patents

Abstract

A dynamic load tracking central air conditioner cold source global optimum energy-saving control method relates to the technical field of air conditioning. The method aims at achieving the effect of saving operation energy consumption of the central air conditioner. The method includes first building a water chilling unit model, a water pump model and a speed changing cooling tower model of the central air conditioner, collecting working condition samples of the central air conditioner, estimating model coefficients of each model according to the collected working condition samples, building a system optimizing model of the central air conditioner according to the water chilling unit model, the water pump model and the speed changing cooling tower model, utilizing the system optimizing model to calculate the theoretical working conditions of water chilling units, water pumps and cooling tower fans in the operation process of the central air conditioner and adjusting the water chilling units, the water pumps and the cooling tower fans according to a calculation result. The method is suitable for being matched with a central air conditioner system in use.

Description

The central air-conditioning low-temperature receiver global optimum energy-saving control method that dynamic load is followed the tracks of

Technical field

The present invention relates to air-conditioning technical, particularly relate to a kind of technology of central air-conditioning low-temperature receiver global optimum energy-saving control method of dynamic load tracking.

Background technology

At present, the summer air-conditioning energy consumption sharply rises, and the trend that air conditioning electricity increases sharply has caused the mains supply anxiety, and a large amount of electric energy are engulfed by industry and civil buildings air-conditioning, and the operation energy consumption of especially heavy construction central air conditioner system is quite high.The design capacity of central air-conditioning calculates by peak load, and most of building has only tens day time central air-conditioning to be in the peak load state in 1 year, the central air-conditioning refrigeration duty is among the dynamic change all the time, as round the clock, the temperature difference, climate change, environment and humane situation affect the refrigeration duty of central air-conditioning constantly.Generally, refrigeration duty fluctuates in 5%～60% scope, and the time in most of building every year at least 70% is to be in this state.And the actual start capacity of most of central air-conditioning as if being that peak power drives with the maximum cold load, causes the contradiction between the output of actual needs refrigeration duty and peak power much smaller than installed capacity, causes huge energy waste.This has brought severe problem for the Energy Saving Control of central air-conditioning.

The electric load breach increases, and the power supply shortage situation was difficult to be eased in recent years.Therefore, energy-conservation especially economize on electricity not only has the important social meaning but also has urgent realistic meaning.Active research develop and spread environmental protection air-conditioning technology and equipment, suppressing air conditioning energy consumption increases, and has become urgent and popular research topic of building field of heating ventilation air conditioning.

Traditional central air conditioner system is to adopt constant current amount pattern, or adopt low-temperature receiver side constant current amount and the pattern of load side unsteady flow amount is moved, the required load of system is by peak load, worst meteorological condition and the poorest use working environment design, and in the actual motion the required load most of the time of system all below 50%, and while when load variations, traditional central air conditioner system operational factor can not be accomplished adjusted in concert at all, the regulating measure that lags behind is except by main frame passively the loading and unloading, other the control device that almost what do not have, therefore there is great energy dissipation in traditional central air conditioner system.

Summary of the invention

At the defective that exists in the above-mentioned prior art, technical problem to be solved by this invention provides the central air-conditioning low-temperature receiver global optimum energy-saving control method that a kind of dynamic load that can save the central air-conditioning operation energy consumption is followed the tracks of.

In order to solve the problems of the technologies described above, the central air-conditioning low-temperature receiver global optimum energy-saving control method that a kind of dynamic load provided by the present invention is followed the tracks of is characterized in that concrete steps are as follows:

1) sets up handpiece Water Chilling Units model, water pump model, the speed change cooling tower model of central air-conditioning;

The model formation of handpiece Water Chilling Units model is:

PWR _ch,i＝b _0,i+b _1,i(t _CWT,i-t _chws,i)+b _2,i(t _CWT,i-t _chws,i) ²

+b _3,iQ _ch,i+b _4,iQ ² _ch,i+b _5,i(t _CWT,i-t _chws,i)Q _ch,i

Wherein, PWR _{Ch, i}Be the handpiece Water Chilling Units energy consumption of i platform handpiece Water Chilling Units in the central air-conditioning, t _{CWT, i}Be the cooling water leaving water temperature of i platform handpiece Water Chilling Units in the central air-conditioning, t _{Chws, i}Be the chilled water supply water temperature of i platform handpiece Water Chilling Units in the central air-conditioning, Q _{Ch, i}Be the handpiece Water Chilling Units load of i platform handpiece Water Chilling Units in the central air-conditioning, b _{0, i}, b _{1, i}, b _{2, i}, b _{3, i}, b _{4, i}, b _{5, i}Be the handpiece Water Chilling Units model coefficient of i platform handpiece Water Chilling Units in the central air-conditioning;

The model formation of water pump model is:

${\mathrm{PWR}}_{\mathrm{pum},j}={r^2}_{\mathrm{pum},j}{f}_{0,j}+r_{\mathrm{pum},j}{f}_{1,j}{G}_{\mathrm{pum},j}+f_{2,j}{G^2}_{\mathrm{pum},j}+\frac{d_{3,j}}{r_{\mathrm{pum},j}}{G^3}_{\mathrm{pum},j}$

In the formula: $r_{\mathrm{pum},j}=\frac{n_j}{n_{0,j}}$

Wherein, PWR _{Pum, j}Be the pump shaft power of j platform water pump in the central air-conditioning, r _{Pum, j}Be the pump rotary speed ratio of j platform water pump in the central air-conditioning, n _jBe the actual speed of j platform water pump in the central air-conditioning, n _{0, j}Be the rated speed of j platform water pump in the central air-conditioning, G _{Pum, j}Be the water pump volume flow of j platform water pump in the central air-conditioning, f _{0, j}, f _{1, j}, f _{2, j}, d _{3, j}Be the water pump model coefficient of water pump model;

The model formation of speed change cooling tower model is:

${\mathrm{PWR}}_{\mathrm{tWT},k}={\mathrm{PWR}}_f={\mathrm{PWR}}_{f,\max }\·{\mathrm{\Σ}}_{k=0}^Z{P}_k{\left(\frac{r_{f,k}}{r_{f,k,\max }}\right)}^k$

Wherein, PWR _fBe the actual fan general power of the cooling tower fan in the central air-conditioning, PWR _{F, max}Be the maximum fan power of the cooling tower fan in the central air-conditioning, r _{F, k}Be the actual rotation speed of the fan of the k platform cooling tower fan in the central air-conditioning, r _{F, k, max}Be the maximum rotation speed of the fan of the k platform cooling tower fan in the central air-conditioning, P _kCooling tower model coefficient for cooling tower model;

2) gather the operating mode sample of central air-conditioning, and according to the operating mode sample of gathering, utilize least square method to estimate each handpiece Water Chilling Units model coefficient b _{0, i}, b _{1, i}, b _{2, i}, b _{3, i}, b _{4, i}, b _{5, i}, and each water pump model coefficient f _{0, j}, f _{1, j}, f _{2, j}, d _{3, j}, and the cooling tower model FACTOR P _k

Wherein, include the handpiece Water Chilling Units energy consumption of each handpiece Water Chilling Units, the cooling water leaving water temperature of each handpiece Water Chilling Units, the chilled water supply water temperature of each handpiece Water Chilling Units, the handpiece Water Chilling Units load of each handpiece Water Chilling Units, the pump shaft power of each water pump, the actual speed of each water pump, the water pump volume flow of each water pump, the actual rotation speed of the fan of each cooling tower fan in the operating mode sample of central air-conditioning;

3) set up the system optimization model of central air-conditioning, the concrete model formula is:

$F=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{ch},i}+\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{pum},j}+\underset{k=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{tWT},k}$

$+{(Q_{\mathrm{cl}}-\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{Q}_{\mathrm{ch},i})}^2+{[Q_{\mathrm{con}}-{\mathrm{\ρ}}_w{G}_{\mathrm{cw}}\mathrm{\θ}(t_{\mathrm{in}}-t_{\mathrm{out}})]}^2$

$+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{\mathrm{0,20}-t_{\mathrm{CWT},i}\left\}\right]}^2+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{0,t_{\mathrm{CWT},i}-45\left\}\right]}^2$

$+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{\mathrm{0,118}-Q_{\mathrm{ch},i}\left\}\right]}^2+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{0,Q_{\mathrm{ch},i}-590\left\}\right]}^2$

In the formula:

$Q_{\mathrm{con}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{Q}_{\mathrm{con},i}$

$t_{\mathrm{in}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}\frac{G_{\mathrm{con},i}}{G_{\mathrm{cw}}}{t}_{\mathrm{CWT},i}$

$t_{\mathrm{out}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}\frac{G_{\mathrm{tWT},i}}{G_{\mathrm{cw}}}{t}_{\mathrm{out},i}$

$G_{\mathrm{cw}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{G}_{\mathrm{con},i}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{G}_{\mathrm{tWT},i}$

Wherein, Q _ClBe the handpiece Water Chilling Units total load of central air-conditioning, Q _ConBe the total condensation heat of the handpiece Water Chilling Units of central air-conditioning, ρ _wBe the density of water, θ is specific heat of water, G _CwBe the cooling water total flow of central air-conditioning, Q _{Con, i}Be the condensation heat of i platform handpiece Water Chilling Units in the central air-conditioning, t _InBe the total inflow temperature of the cooling tower of central air-conditioning, t _OutBe the total leaving water temperature of the cooling tower of central air-conditioning, G _{Con, i}Be the cooling water flow of i platform handpiece Water Chilling Units in the central air-conditioning, G _{TWT, i}The cooling water flow of i platform cooling tower in the central air-conditioning, t _{Out, i}Leaving water temperature for i platform cooling tower in the central air-conditioning;

4) utilize sensor to gather the environment temperature of central air-conditioning refrigeration duty output area, and according to the environment temperature of central air-conditioning load output area, calculate the handpiece Water Chilling Units total load of central air-conditioning;

5) the handpiece Water Chilling Units total load that calculates according to step 4, the central air conditioner system of utilizing step 3 to set up is optimized model, calculate the cooling water leaving water temperature of each handpiece Water Chilling Units, the chilled water supply water temperature of each handpiece Water Chilling Units, the condensation heat of each handpiece Water Chilling Units, the cooling water flow of each cooling tower, the leaving water temperature of each cooling tower, the actual speed of each water pump, the water pump volume flow of each water pump, the actual rotation speed of the fan of each cooling tower fan, and according to result of calculation each handpiece Water Chilling Units, each water pump and each cooling tower fan are regulated.

The central air-conditioning low-temperature receiver global optimum energy-saving control method that dynamic load provided by the invention is followed the tracks of, estimate the handpiece Water Chilling Units model by the operating mode sample of gathering, the model coefficient of water pump model and speed change cooling tower model, in the central air-conditioning running, utilize the system optimization model to calculate the optimum condition of central air-conditioning, and according to the operating mode enforcement adjusting of result of calculation to central air-conditioning, can realize the dynamic load tracking of central air-conditioning, and dynamic operation condition is regulated, the operating mode of central air-conditioning can be adjusted automatically with load variations, make the operating condition of central air-conditioning be in all the time on the best operating point of optimization, can save the operation energy consumption of central air-conditioning.

The specific embodiment

Below in conjunction with specific embodiment the present invention is described in further detail, but present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.

The central air-conditioning low-temperature receiver global optimum energy-saving control method that a kind of dynamic load that the embodiment of the invention provides is followed the tracks of is characterized in that concrete steps are as follows:

1) sets up handpiece Water Chilling Units model, water pump model, the speed change cooling tower model of central air-conditioning;

The model formation of handpiece Water Chilling Units model is:

PWR _ch,i＝b _0,i+b _1,i(t _CWT,i-t _chws,i)+b _2,i(t _CWT,i-t _chws,i) ²

+b _3,iQ _ch,i+b _4,iQ ² _ch,i+b _5,i(t _CWT,i-t _chws,i)Q _ch,i

Wherein, PWR _{Ch, i}Be the handpiece Water Chilling Units energy consumption of i platform handpiece Water Chilling Units in the central air-conditioning, t _{CWT, i}Be the cooling water leaving water temperature of i platform handpiece Water Chilling Units in the central air-conditioning, t _{Chws, i}Be the chilled water supply water temperature of i platform handpiece Water Chilling Units in the central air-conditioning, Q _{Ch, i}Be the handpiece Water Chilling Units load of i platform handpiece Water Chilling Units in the central air-conditioning, b _{0, i}, b _{1, i}, b _{2, i}, b _{3, i}, b _{4, i}, b _{5, i}Be the handpiece Water Chilling Units model coefficient of i platform handpiece Water Chilling Units in the central air-conditioning;

The model formation of water pump model is:

${\mathrm{PWR}}_{\mathrm{pum},j}={r^2}_{\mathrm{pum},j}{f}_{0,j}+r_{\mathrm{pum},j}{f}_{1,j}{G}_{\mathrm{pum},j}+f_{2,j}{G^2}_{\mathrm{pum},j}+\frac{d_{3,j}}{r_{\mathrm{pum},j}}{G^3}_{\mathrm{pum},j}$

In the formula: $r_{\mathrm{pum},j}=\frac{n_j}{n_{0,j}}$

Wherein, PWR _{Pum, j}Be the pump shaft power of j platform water pump in the central air-conditioning, r _{Pum, j}Be the pump rotary speed ratio of j platform water pump in the central air-conditioning, n _jBe the actual speed of j platform water pump in the central air-conditioning, n _{0, j}Be the rated speed of j platform water pump in the central air-conditioning, G _{Pum, j}Be the water pump volume flow of j platform water pump in the central air-conditioning, f _{0, j}, f _{1, j}, f _{2, j}, d _{3, j}Be the water pump model coefficient of water pump model;

The model formation of speed change cooling tower model is:

${\mathrm{PWR}}_{\mathrm{tWT},k}={\mathrm{PWR}}_f={\mathrm{PWR}}_{f,\max }\·{\mathrm{\Σ}}_{k=0}^Z{P}_k{\left(\frac{r_{f,k}}{r_{f,k,\max }}\right)}^k$

Wherein, PWR _fBe the actual fan general power of the cooling tower fan in the central air-conditioning, PWR _{F, max}Be the maximum fan power of the cooling tower fan in the central air-conditioning, r _{F, k}Be the actual rotation speed of the fan of the k platform cooling tower fan in the central air-conditioning, r _{F, k, max}Be the maximum rotation speed of the fan of the k platform cooling tower fan in the central air-conditioning, P _kCooling tower model coefficient for cooling tower model;

2) gather the operating mode sample of central air-conditioning, and according to the operating mode sample of gathering, utilize least square method to estimate each handpiece Water Chilling Units model coefficient b _{0, i}, b _{1, i}, b _{2, i}, b _{3, i}, b _{4, i}, b _{5, i}, and each water pump model coefficient f _{0, j}, f _{1, j}, f _{2, j}, d _{3, j}, and the cooling tower model FACTOR P _k

Wherein, include the handpiece Water Chilling Units energy consumption of each handpiece Water Chilling Units, the cooling water leaving water temperature of each handpiece Water Chilling Units, the chilled water supply water temperature of each handpiece Water Chilling Units, the handpiece Water Chilling Units load of each handpiece Water Chilling Units, the pump shaft power of each water pump, the actual speed of each water pump, the water pump volume flow of each water pump, the actual rotation speed of the fan of each cooling tower fan in the operating mode sample of central air-conditioning;

3) set up the system optimization model of central air-conditioning, the concrete model formula is:

$F=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{ch},i}+\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{pum},j}+\underset{k=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{tWT},k}$

$+{(Q_{\mathrm{cl}}-\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{Q}_{\mathrm{ch},i})}^2+{[Q_{\mathrm{con}}-{\mathrm{\ρ}}_w{G}_{\mathrm{cw}}\mathrm{\θ}(t_{\mathrm{in}}-t_{\mathrm{out}})]}^2$

$+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{\mathrm{0,20}-t_{\mathrm{CWT},i}\left\}\right]}^2+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{0,t_{\mathrm{CWT},i}-45\left\}\right]}^2$

$+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{\mathrm{0,118}-Q_{\mathrm{ch},i}\left\}\right]}^2+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{0,Q_{\mathrm{ch},i}-590\left\}\right]}^2$

In the formula:

$Q_{\mathrm{con}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{Q}_{\mathrm{con},i}$

$t_{\mathrm{in}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}\frac{G_{\mathrm{con},i}}{G_{\mathrm{cw}}}{t}_{\mathrm{CWT},i}$

$t_{\mathrm{out}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}\frac{G_{\mathrm{tWT},i}}{G_{\mathrm{cw}}}{t}_{\mathrm{out},i}$

$G_{\mathrm{cw}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{G}_{\mathrm{con},i}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{G}_{\mathrm{tWT},i}$

Wherein, Q _ClBe the handpiece Water Chilling Units total load of central air-conditioning, Q _ConBe the total condensation heat of the handpiece Water Chilling Units of central air-conditioning, ρ _wBe the density of water, θ is specific heat of water, G _CwBe the cooling water total flow of central air-conditioning, Q _{Con, i}Be the condensation heat of i platform handpiece Water Chilling Units in the central air-conditioning, t _InBe the total inflow temperature of the cooling tower of central air-conditioning, t _OutBe the total leaving water temperature of the cooling tower of central air-conditioning, G _{Con, i}Be the cooling water flow of i platform handpiece Water Chilling Units in the central air-conditioning, G _{TWT, i}The cooling water flow of i platform cooling tower in the central air-conditioning, t _{Out, i}Leaving water temperature for i platform cooling tower in the central air-conditioning;

4) utilize sensor to gather the environment temperature of central air-conditioning refrigeration duty output area, and according to the environment temperature of central air-conditioning load output area, calculate the handpiece Water Chilling Units total load of central air-conditioning;

5) the handpiece Water Chilling Units total load that calculates according to step 4, the central air conditioner system of utilizing step 3 to set up is optimized model, calculate the cooling water leaving water temperature of each handpiece Water Chilling Units, the chilled water supply water temperature of each handpiece Water Chilling Units, the condensation heat of each handpiece Water Chilling Units, the cooling water flow of each cooling tower, the leaving water temperature of each cooling tower, the actual speed of each water pump, the water pump volume flow of each water pump, the actual rotation speed of the fan of each cooling tower fan, and according to result of calculation each handpiece Water Chilling Units, each water pump and each cooling tower fan are regulated.

The supporting use of the embodiment of the invention and central air conditioner system can realize the energy-efficient of central air conditioner system, calculates through theory, compares with constant current amount central air conditioner system, and the average of the whole year power saving rate can reach 20%～30%.

Claims (1)

1. the central air-conditioning low-temperature receiver global optimum energy-saving control method followed the tracks of of a dynamic load is characterized in that concrete steps are as follows:

1) sets up handpiece Water Chilling Units model, water pump model, the speed change cooling tower model of central air-conditioning;

The model formation of handpiece Water Chilling Units model is:

PWR _ch,i＝b _0,i+b _1,i(t _CWT,i-t _chws,i)+b _2,i(t _CWT,i-t _chws,i) ²

+b _3,iQ _ch,i+b _4,iQ ² _ch,i+b _5,i(t _CWT,i-t _chws,i)Q _ch,i

Wherein, PWR _{Ch, i}Be the handpiece Water Chilling Units energy consumption of i platform handpiece Water Chilling Units in the central air-conditioning, t _{CWT, i}Be the cooling water leaving water temperature of i platform handpiece Water Chilling Units in the central air-conditioning, t _Chws, _iBe the chilled water supply water temperature of i platform handpiece Water Chilling Units in the central air-conditioning, Q _{Ch, i}Be the handpiece Water Chilling Units load of i platform handpiece Water Chilling Units in the central air-conditioning, b _{0, i}, b _{1, i}, b _{2, i}, b _{3, i}, b _{4, i}, b _{5, i}Be the handpiece Water Chilling Units model coefficient of i platform handpiece Water Chilling Units in the central air-conditioning;

The model formation of water pump model is:

${\mathrm{PWR}}_{\mathrm{pum},j}={r^2}_{\mathrm{pum},j}{f}_{0,j}+r_{\mathrm{pum},j}{f}_{1,j}{G}_{\mathrm{pum},j}+f_{2,j}{G^2}_{\mathrm{pum},j}+\frac{d_{3,j}}{r_{\mathrm{pum},j}}{G^3}_{\mathrm{pum},j}$

In the formula: $r_{\mathrm{pum},j}=\frac{n_j}{n_{0,j}}$

Wherein, PWR _{Pum, j}Be the pump shaft power of j platform water pump in the central air-conditioning, r _{Pum, j}Be the pump rotary speed ratio of j platform water pump in the central air-conditioning, n _jBe the actual speed of j platform water pump in the central air-conditioning, n _{0, j}Be the rated speed of j platform water pump in the central air-conditioning, G _{Pum, j}Be the water pump volume flow of j platform water pump in the central air-conditioning, f _{0, j}, f _{1, j}, f _{2, j}, d _{3, j}Be the water pump model coefficient of water pump model;

The model formation of speed change cooling tower model is:

${\mathrm{PWR}}_{\mathrm{tWT},k}={\mathrm{PWR}}_f={\mathrm{PWR}}_{f,\max }\·{\mathrm{\Σ}}_{k=0}^Z{P}_k{\left(\frac{r_{f,k}}{r_{f,k,\max }}\right)}^k$

Wherein, PWR _fBe the actual fan general power of the cooling tower fan in the central air-conditioning, PWR _{F, max}Be the maximum fan power of the cooling tower fan in the central air-conditioning, r _{F, k}Be the actual rotation speed of the fan of the k platform cooling tower fan in the central air-conditioning, r _{F, k, max}Be the maximum rotation speed of the fan of the k platform cooling tower fan in the central air-conditioning, P _kCooling tower model coefficient for cooling tower model;

2) gather the operating mode sample of central air-conditioning, and according to the operating mode sample of gathering, utilize least square method to estimate each handpiece Water Chilling Units model coefficient b _{0, i}, b _{1, i}, b _{2, i}, b _{3, i}, b _{4, i}, b _{5, i}, and each water pump model coefficient f _{0, j}, f _{1, j}, f _{2, j}, d _{3, j}, and the cooling tower model FACTOR P _k

Wherein, include the handpiece Water Chilling Units energy consumption of each handpiece Water Chilling Units, the cooling water leaving water temperature of each handpiece Water Chilling Units, the chilled water supply water temperature of each handpiece Water Chilling Units, the handpiece Water Chilling Units load of each handpiece Water Chilling Units, the pump shaft power of each water pump, the actual speed of each water pump, the water pump volume flow of each water pump, the actual rotation speed of the fan of each cooling tower fan in the operating mode sample of central air-conditioning;

3) set up the system optimization model of central air-conditioning, the concrete model formula is:

$F=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{ch},i}+\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{pum},j}+\underset{k=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{PWR}}_{\mathrm{tWT},k}$

$+{(Q_{\mathrm{cl}}-\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{Q}_{\mathrm{ch},i})}^2+{[Q_{\mathrm{con}}-{\mathrm{\ρ}}_w{G}_{\mathrm{cw}}\mathrm{\θ}(t_{\mathrm{in}}-t_{\mathrm{out}})]}^2$

$+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{\mathrm{0,20}-t_{\mathrm{CWT},i}\left\}\right]}^2+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{0,t_{\mathrm{CWT},i}-45\left\}\right]}^2$

$+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{\mathrm{0,118}-Q_{\mathrm{ch},i}\left\}\right]}^2+\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\left[\max \right\{0,Q_{\mathrm{ch},i}-590\left\}\right]}^2$

In the formula:

$Q_{\mathrm{con}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{Q}_{\mathrm{con},i}$

$t_{\mathrm{in}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}\frac{G_{\mathrm{con},i}}{G_{\mathrm{cw}}}{t}_{\mathrm{CWT},i}$

$t_{\mathrm{out}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}\frac{G_{\mathrm{tWT},i}}{G_{\mathrm{cw}}}{t}_{\mathrm{out},i}$

$G_{\mathrm{cw}}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{G}_{\mathrm{con},i}=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{G}_{\mathrm{tWT},i}$

Wherein, Q _ClBe the handpiece Water Chilling Units total load of central air-conditioning, Q _ConBe the total condensation heat of the handpiece Water Chilling Units of central air-conditioning, ρ _wBe the density of water, θ is specific heat of water, G _CwBe the cooling water total flow of central air-conditioning, Q _{Con, i}Be the condensation heat of i platform handpiece Water Chilling Units in the central air-conditioning, t _InBe the total inflow temperature of the cooling tower of central air-conditioning, t _OutBe the total leaving water temperature of the cooling tower of central air-conditioning, G _{Con, i}Be the cooling water flow of i platform handpiece Water Chilling Units in the central air-conditioning, G _{TWT, i}The cooling water flow of i platform cooling tower in the central air-conditioning, t _{Out, i}Leaving water temperature for i platform cooling tower in the central air-conditioning;

4) utilize sensor to gather the environment temperature of central air-conditioning refrigeration duty output area, and according to the environment temperature of central air-conditioning load output area, calculate the handpiece Water Chilling Units total load of central air-conditioning;

5) the handpiece Water Chilling Units total load that calculates according to step 4, the central air conditioner system of utilizing step 3 to set up is optimized model, calculate the cooling water leaving water temperature of each handpiece Water Chilling Units, the chilled water supply water temperature of each handpiece Water Chilling Units, the condensation heat of each handpiece Water Chilling Units, the cooling water flow of each cooling tower, the leaving water temperature of each cooling tower, the actual speed of each water pump, the water pump volume flow of each water pump, the actual rotation speed of the fan of each cooling tower fan, and according to result of calculation each handpiece Water Chilling Units, each water pump and each cooling tower fan are regulated.