Bobine stator

Codul pentru a inregistra pe SDcard parametri de functionare VAWT (curent, tensiune , putere, energie) folosind aceeasi configuratie Arduido+Shield Ethernet

#include <SD.h>
#include <Wire.h>
const int chipSelect = 4;

File dataFile;

float sample1=0;
float sample2=0;
float voltage=0.0;
float actualval;
float amps=0.0;
float totamps=0.0;
float avgamps=0.0;
float amphr=0.0;
float watt=0.0;
float energy=0.0;
float val11=0;
float val2=0;
float i1 = 0;
float i = 0;

void setup()
{

Serial.begin(9600);
while (!Serial) {
;
}

Serial.print("Initializing SD card...");

pinMode(SS, OUTPUT);

if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
while (1) ;
}
Serial.println("card initialized.");

dataFile = SD.open("energy.txt", FILE_WRITE);
if (! dataFile) {
Serial.println("error opening energy.txt");

while (1) ;
}
}

void loop()

{

long milisec = millis();
long time=milisec/1000;

for(int i=0;i<150;i++)
{
sample1+=analogRead(A1);
sample2+=analogRead(A2);
delay(2);
}
sample1=sample1/150;
sample2=sample2/150;

float temp;
val11=sample1; 
temp=val11/4.092; 
val2=(temp/10);
i1 = sample2;
i = ((.0049 * i1) - 2.5)/.066;

voltage=val2;
amps =i;

totamps=totamps+amps;
avgamps=totamps/time;
amphr=(avgamps*time);
watt =voltage*amps;
energy=(watt*time)/3600;

////////////////////////////////////////////////////////

String dataString = "";
int parameter[4]={
voltage,amps,watt,energy };

for (int i = 0; i < 4; i++)
{
int sensor = parameter[i];
dataString += String(sensor);
if (i < 4)
{
dataString += ",";
}
}

dataFile.println(dataString);

Serial.println(dataString);

dataFile.flush();

delay(500);
}

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#include <SD.h>

#include <Wire.h>

const int chipSelect = 4;

File dataFile;

float sample1=0;

float sample2=0;

float voltage=0.0;

float actualval;

float amps=0.0;

float totamps=0.0;

float avgamps=0.0;

float amphr=0.0;

float watt=0.0;

float energy=0.0;

float val11=0;

float val2=0;

float i1 = 0;

float i = 0;

void setup()

{

Serial.begin(9600);

while (!Serial) {

;

}

Serial.print("Initializing SD card...");

pinMode(SS, OUTPUT);

if (!SD.begin(chipSelect)) {

Serial.println("Card failed, or not present");

// don't do anything more:

while (1) ;

}

Serial.println("card initialized.");

dataFile = SD.open("energy.txt", FILE_WRITE);

if (! dataFile) {

Serial.println("error opening energy.txt");

while (1) ;

}

void loop()

{

long milisec = millis();

long time=milisec/1000;

for(int i=0;i<150;i++)

{

sample1+=analogRead(A1);

sample2+=analogRead(A2);

delay(2);

}

sample1=sample1/150;

sample2=sample2/150;

float temp;

val11=sample1;

temp=val11/4.092;

val2=(temp/10);

i1 = sample2;

i = ((.0049 * i1) - 2.5)/.066;

voltage=val2;

amps =i;

totamps=totamps+amps;

avgamps=totamps/time;

amphr=(avgamps*time);

watt =voltage*amps;

energy=(watt*time)/3600;

////////////////////////////////////////////////////////

String dataString = "";

int parameter[4]={

voltage,amps,watt,energy };

for (int i = 0; i < 4; i++)

{

int sensor = parameter[i];

dataString += String(sensor);

if (i < 4)

{

dataString += ",";

}

dataFile.println(dataString);

Serial.println(dataString);

dataFile.flush();

delay(500);

}

VAWT monitorizare parametri functionare cu Arduino

Posted on 12 ianuarie 2015 by admin

Răspunde

VAWT ARDUINO ! Solutia oferita de Energy Box a deschis o cale catre o solutie de monitorizare economica si eficienta a parametrilor unei turbine eoliene. O varianta mai simpla dar nu atat de performanta ca cea oferita de Energy Box este folosirea unui WEB server instalat pe perechea Arduino+W5100. Pagina WEB se afla pe SD cardul instalat in ethernet shield w5100 :

index

VAWT ARDUINO

Componente necesare :

Arduido+Shield Ethernet 70 Ron
Senzor tensiune 19 Ron (se conecteza la pinul A1 analogic)
Senzor curent 21 Ron (se conecteza la pinul A2 analogic)
Senzor temperatura si umiditate 16 Ron (se conecteaza la pinul A0 analogic)

Total 126 Ron (daca se comanda de pe Ebay valoarea scade destul de mult) Urmeza sa completez sistemul cu :

sa introduc in program o rutina pentru scrierea datelor pe SD card
sa introduc in sistem un anemometru

Am reusit cu un router wireless portabil TL-WR702N setat in modul “acces point” sau “client” (pentru integrare intr-o retea deja existenta) sa accesez wireless parametri de functionare a eolienei.

Codul necesar pentru VAWT Arduino .

#include <Wire.h>
#include <dht.h>
#include <SPI.h>
#include <Ethernet.h>
#include <SD.h>

int u=0;
int t=0;
float val11=0; 
float val2=0;
float i1 = 0; // initial current value;  
float i = 0; // initial calculated current value;  
dht DHT;

// size of buffer used to capture HTTP requests
#define REQ_BUF_SZ   50

// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 1, 4); // IP address, may need to change depending on network
EthernetServer server(80);  // create a server at port 80
File webFile;               // the web page file on the SD card
char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string
char req_index = 0;              // index into HTTP_req buffer

// _____________________________________________________ 



void setup() 
{   
 
// disable Ethernet chip
    pinMode(10, OUTPUT);
    digitalWrite(10, HIGH);

    Serial.begin(9600);       // for debugging
    
    // initialize SD card
    Serial.println("Initializing SD card...");
    if (!SD.begin(4)) {
        Serial.println("ERROR - SD card initialization failed!");
        return;    // init failed
    }
    Serial.println("SUCCESS - SD card initialized.");
    // check for index.htm file
    if (!SD.exists("index.htm")) {
        Serial.println("ERROR - Can't find index.htm file!");
        return;  // can't find index file
    }
    Serial.println("SUCCESS - Found index.htm file.");
    
    Ethernet.begin(mac, ip);  // initialize Ethernet device
    server.begin();           // start to listen for clients
} 




void loop() 
{  

EthernetClient client = server.available();  // try to get client

    if (client) {  // got client?
        boolean currentLineIsBlank = true;
        while (client.connected()) {
            if (client.available()) {   // client data available to read
                char c = client.read(); // read 1 byte (character) from client
                // buffer first part of HTTP request in HTTP_req array (string)
                // leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)
                if (req_index < (REQ_BUF_SZ - 1)) {
                    HTTP_req[req_index] = c;          // save HTTP request character
                    req_index++;
                }
                // last line of client request is blank and ends with \n
                // respond to client only after last line received
                if (c == '\n' && currentLineIsBlank) {
                    // send a standard http response header
                    client.println("HTTP/1.1 200 OK");
                    // remainder of header follows below, depending on if
                    // web page or XML page is requested
                    // Ajax request - send XML file
                    if (StrContains(HTTP_req, "ajax_inputs")) {
                        // send rest of HTTP header
                        client.println("Content-Type: text/xml");
                        client.println("Connection: keep-alive");
                        client.println();
                        // send XML file containing input states
                        XML_response(client);
                    }
                    else {  // web page request
                        // send rest of HTTP header
                        client.println("Content-Type: text/html");
                        client.println("Connection: keep-alive");
                        client.println();
                        // send web page
                        webFile = SD.open("index.htm");        // open web page file
                        if (webFile) {
                            while(webFile.available()) {
                                client.write(webFile.read()); // send web page to client
                            }
                            webFile.close();
                        }
                    }
                    // display received HTTP request on serial port
                    Serial.print(HTTP_req);
                    // reset buffer index and all buffer elements to 0
                    req_index = 0;
                    StrClear(HTTP_req, REQ_BUF_SZ);
                    break;
                }
                // every line of text received from the client ends with \r\n
                if (c == '\n') {
                    // last character on line of received text
                    // starting new line with next character read
                    currentLineIsBlank = true;
                } 
                else if (c != '\r') {
                    // a text character was received from client
                    currentLineIsBlank = false;
                }
            } // end if (client.available())
        } // end while (client.connected())
        delay(1);      // give the web browser time to receive the data
        client.stop(); // close the connection
    } // end if (client)
 
}
// send the XML file containing analog value
void XML_response(EthernetClient cl)
{
  
  char sample;


DHT.read11(A0);
t=DHT.temperature;
u=DHT.humidity;

 float temp;       
 val11=sample1; 
 temp=val11/4.092; 
 val2=(temp/10);   
 i1 = analogRead(2); 
 i = ((.0049 * i1) - 2.5)/.066;

delay(1000);  

 
 
  cl.print("<?xml version = \"1.0\" ?>");
    cl.print("<inputs>");
   
//    analog_val = i;
    cl.print("<analog>");
    cl.print(i);
    cl.print("</analog>");
    
//    analog_val = u;
    cl.print("<analog>");
    cl.print(u);
    cl.print("</analog>");
    
//    analog_val = t;
    cl.print("<analog>");
    cl.print(t);
    cl.print("</analog>");
    
//    analog_val = val2;
    cl.print("<analog>");
    cl.print(val2);
    cl.print("</analog>");
    
    cl.print("</inputs>");
}

// sets every element of str to 0 (clears array)
void StrClear(char *str, char length)
{
    for (int i = 0; i < length; i++) {
        str[i] = 0;
    }
}

// searches for the string sfind in the string str
// returns 1 if string found
// returns 0 if string not found
char StrContains(char *str, char *sfind)
{
    char found = 0;
    char index = 0;
    char len;

    len = strlen(str);
    
    if (strlen(sfind) > len) {
        return 0;
    }
    while (index < len) {
        if (str[index] == sfind[found]) {
            found++;
            if (strlen(sfind) == found) {
                return 1;
            }
        }
        else {
            found = 0;
        }
        index++;
    }

    return 0;


               
}

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#include <Wire.h>

#include <dht.h>

#include <SPI.h>

#include <Ethernet.h>

#include <SD.h>

int u=0;

int t=0;

float val11=0;

float val2=0;

float i1 = 0; // initial current value;

float i = 0; // initial calculated current value;

dht DHT;

// size of buffer used to capture HTTP requests

#define REQ_BUF_SZ 50

// MAC address from Ethernet shield sticker under board

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

IPAddress ip(192, 168, 1, 4); // IP address, may need to change depending on network

EthernetServer server(80); // create a server at port 80

File webFile; // the web page file on the SD card

char HTTP_req[REQ_BUF_SZ] = {0}; // buffered HTTP request stored as null terminated string

char req_index = 0; // index into HTTP_req buffer

// _____________________________________________________

void setup()

{

// disable Ethernet chip

pinMode(10, OUTPUT);

digitalWrite(10, HIGH);

Serial.begin(9600); // for debugging

// initialize SD card

Serial.println("Initializing SD card...");

if (!SD.begin(4)) {

Serial.println("ERROR - SD card initialization failed!");

return; // init failed

}

Serial.println("SUCCESS - SD card initialized.");

// check for index.htm file

if (!SD.exists("index.htm")) {

Serial.println("ERROR - Can't find index.htm file!");

return; // can't find index file

}

Serial.println("SUCCESS - Found index.htm file.");

Ethernet.begin(mac, ip); // initialize Ethernet device

server.begin(); // start to listen for clients

}

void loop()

{

EthernetClient client = server.available(); // try to get client

if (client) { // got client?

boolean currentLineIsBlank = true;

while (client.connected()) {

if (client.available()) { // client data available to read

char c = client.read(); // read 1 byte (character) from client

// buffer first part of HTTP request in HTTP_req array (string)

// leave last element in array as 0 to null terminate string (REQ_BUF_SZ - 1)

if (req_index < (REQ_BUF_SZ - 1)) {

HTTP_req[req_index] = c; // save HTTP request character

req_index++;

}

// last line of client request is blank and ends with \n

// respond to client only after last line received

if (c == '\n' && currentLineIsBlank) {

// send a standard http response header

client.println("HTTP/1.1 200 OK");

// remainder of header follows below, depending on if

// web page or XML page is requested

// Ajax request - send XML file

if (StrContains(HTTP_req, "ajax_inputs")) {

// send rest of HTTP header

client.println("Content-Type: text/xml");

client.println("Connection: keep-alive");

client.println();

// send XML file containing input states

XML_response(client);

}

else { // web page request

// send rest of HTTP header

client.println("Content-Type: text/html");

client.println("Connection: keep-alive");

client.println();

// send web page

webFile = SD.open("index.htm"); // open web page file

if (webFile) {

while(webFile.available()) {

client.write(webFile.read()); // send web page to client

}

webFile.close();

}

// display received HTTP request on serial port

Serial.print(HTTP_req);

// reset buffer index and all buffer elements to 0

req_index = 0;

StrClear(HTTP_req, REQ_BUF_SZ);

break;

}

// every line of text received from the client ends with \r\n

if (c == '\n') {

// last character on line of received text

// starting new line with next character read

currentLineIsBlank = true;

}

else if (c != '\r') {

// a text character was received from client

currentLineIsBlank = false;

}

} // end if (client.available())

} // end while (client.connected())

delay(1); // give the web browser time to receive the data

client.stop(); // close the connection

} // end if (client)

}

// send the XML file containing analog value

void XML_response(EthernetClient cl)

{

char sample;

DHT.read11(A0);

t=DHT.temperature;

u=DHT.humidity;

float temp;

val11=sample1;

temp=val11/4.092;

val2=(temp/10);

i1 = analogRead(2);

i = ((.0049 * i1) - 2.5)/.066;

delay(1000);

cl.print("<?xml version = \"1.0\" ?>");

cl.print("<inputs>");

// analog_val = i;

cl.print("<analog>");

cl.print(i);

cl.print("</analog>");

// analog_val = u;

cl.print("<analog>");

cl.print(u);

cl.print("</analog>");

// analog_val = t;

cl.print("<analog>");

cl.print(t);

cl.print("</analog>");

// analog_val = val2;

cl.print("<analog>");

cl.print(val2);

cl.print("</analog>");

cl.print("</inputs>");

}

// sets every element of str to 0 (clears array)

void StrClear(char *str, char length)

{

for (int i = 0; i < length; i++) {

str[i] = 0;

}

// searches for the string sfind in the string str

// returns 1 if string found

// returns 0 if string not found

char StrContains(char *str, char *sfind)

{

char found = 0;

char index = 0;

char len;

len = strlen(str);

if (strlen(sfind) > len) {

return 0;

}

while (index < len) {

if (str[index] == sfind[found]) {

found++;

if (strlen(sfind) == found) {

return 1;

}

else {

found = 0;

}

index++;

}

return 0;

}

Observatie : Nu am reusit sa urc codul in Arduino (clona) cu placa ethernet shield w5100 montata. Se incarca codul si apoi se monteza placa Wiz5100. Am folosit portiuni de cod de pe pagina Arduino codul pentru pagina HTM index (se copiaza pe SD card)

<!DOCTYPE html>
<html>
    <head>
        <title>Monitorizare turbina eoliana verticala</title>
        <script>
        t = 0;
        u = 0;
        i = 0;
        val2 = 0;
        putere = 0;
        vv=0;
<!-- Gauge Code Starts -->
var Gauge=function(b){function l(a,b){for(var c in b)"object"==typeof b[c]&&"[object Array]"!==Object.prototype.toString.call(b[c])&&"renderTo"!=c?("object"!=typeof a[c]&&(a[c]={}),l(a[c],b[c])):a[c]=b[c]}function q(){z.width=b.width;z.height=b.height;A=z.cloneNode(!0);B=A.getContext("2d");C=z.width;D=z.height;t=C/2;u=D/2;f=t<u?t:u;A.i8d=!1;B.translate(t,u);B.save();a.translate(t,u);a.save()}function v(a){var b=new Date;G=setInterval(function(){var c=(new Date-b)/a.duration;1<c&&(c=1);var f=("function"==
typeof a.delta?a.delta:M[a.delta])(c);a.step(f);1==c&&clearInterval(G)},a.delay||10)}function k(){G&&clearInterval(G);var a=I-n,h=n,c=b.animation;v({delay:c.delay,duration:c.duration,delta:c.fn,step:function(b){n=parseFloat(h)+a*b;E.draw()}})}function e(a){return a*Math.PI/180}function g(b,h,c){c=a.createLinearGradient(0,0,0,c);c.addColorStop(0,b);c.addColorStop(1,h);return c}function p(){var m=93*(f/100),h=f-m,c=91*(f/100),e=88*(f/100),d=85*(f/100);a.save();b.glow&&(a.shadowBlur=h,a.shadowColor=
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F(m,e(45+h*(270/(b.majorTicks.length-1))));a.font=20*(f/200)+"px Arial";a.fillStyle=b.colors.numbers;a.lineWidth=0;a.textAlign="center";a.fillText(b.majorTicks[h],c.x,c.y+3)}}function x(a){var h=b.valueFormat.dec,c=b.valueFormat["int"];a=parseFloat(a);var f=0>a;a=Math.abs(a);if(0<h){a=a.toFixed(h).toString().split(".");h=0;for(c-=a[0].length;h<c;++h)a[0]="0"+a[0];a=(f?"-":"")+a[0]+"."+a[1]}else{a=Math.round(a).toString();h=0;for(c-=a.length;h<c;++h)a="0"+a;a=(f?"-":"")+a}return a}function F(a,b){var c=
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        <h1>Monitorizare turbina eoliana verticala</h1>

<canvas id="an_gauge_3" data-title="Curent" data-units="A" width="250" height="250" data-major-ticks="0 2 4 6 8 10 12 14 16 18 20" data-type="canv-gauge" data-min-value="0" data-max-value="20" data-highlights="0 2 #4D89F2, 2 8 #25B8D9, 8 12 #0BB950, 12 16 #cc5, 16 20 #f33" data-onready="setInterval( function() { Gauge.Collection.get('an_gauge_3').setValue(i);}, 200);"></canvas>

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</html>

<!DOCTYPE html>

<html>

<head>

<title>Monitorizare turbina eoliana verticala</title>

t = 0;

u = 0;

i = 0;

val2 = 0;

putere = 0;

vv=0;

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function GetArduinoInputs()

{

nocache = "&nocache=" + Math.random() * 1000000;

var request = new XMLHttpRequest();

request.onreadystatechange = function()

{

if (this.readyState == 4) {

if (this.status == 200) {

if (this.responseXML != null) {

i = this.responseXML.getElementsByTagName('analog')[0].childNodes[0].nodeValue;

u = this.responseXML.getElementsByTagName('analog')[1].childNodes[0].nodeValue;

t = this.responseXML.getElementsByTagName('analog')[2].childNodes[0].nodeValue;

val2 = this.responseXML.getElementsByTagName('analog')[3].childNodes[0].nodeValue;

putere=val2*i

}

request.open("GET", "ajax_inputs" + nocache, true);

request.send(null);

setTimeout('GetArduinoInputs()', 200);

}

</script>

</head>

<h1>Monitorizare turbina eoliana verticala</h1>

</body>

</html>

VAWT online

Posted on 2 ianuarie 2015 by admin

VAWT monitorizare parametri

Prezentarea grafica a parametrilor de functionare VAWT intr-o pagina WEB poate cuprinde urmatoarele informatii in format analogic si digital : viteza vant, turatie turbina, TSR, curent incarcare, tensiune, putere turbina.

In urmatorul exemplu modulul de afisare primeste valori generate aleator pentru viteza vantului . Turatia, TSR-ul, puterea la ax si curentul de incarcare sunt calculate in functie de viteza vantului pentru un H-Rotor cu dimensiunile D=1.2m, H=1.2m si soliditate 0.75. Astfel sunt simulati si afisati parametri de functionare a unei turbine eoliene verticale.

Pentru a converti valorile analogice a parametrilor monitorizati pentru o turbina eoliana furnizati de senzori si a le transmite online catre o pagina WEB o solutie eleganta si ieftina bazata pe Arduino este oferita de Duduc Nicolae pe Energy Box. VAWT monitorizare : Cu acest tip de solutie se poate evalua performantele turbinelor eoliene si impactul modificarii parametrilor geometrici a turbinei (unghi de atac, diametru, profil aerodinamic, etc) asupra randamentului acesteia.

Este un instrument excelent pentru optimizarea performantelor unei turbine eoliene !

Definirea parametrilor principali a unei turbine eoliene de mica putere

Posted on 1 ianuarie 2015 by admin

Răspunde

Eoliana : conform American Wind Energy Association: AWEA o turbina eoliana de dimensiuni reduse este definita de urmatorii parametri principali :

AWEA Rated Power (kW)
Puterea generata de turbina la o viteza a vantului de 11 m/s.
AWEA Rated Annual Energy (Kwh)
Energia produsa de o turbina timp de un an la o viteza medie a vantului de 5m/s folosind o distributie statistica a frecventei vitezei vantului.
AWEA Rated Sound Level (dB)
Nivelul de zgomot produs de turbina masurat la o distanta de 60m de aceasta la o viteza a vantului de 5m/s. Turbinele care se incadreaza in aceste reguli sunt definite astfel:

Un exemplu de certificare a performantelor unei turbine :

eoliana certificare

Eoliana : pentru a calcula aproximativ Rated Power pentru o turbina data puteti folosi : http://vawt.ro/calcul-puterea-generata-de-vawt/

Pentru a calcula Rated Annual Energy se poate folosi fisierul Excel
Rated Annual Energy

Savonius microturbine

Posted on 30 decembrie 2014 by admin

Răspunde

Un copac artificial cu diametrul de 8m si inaltimea de 12m ce poate extrage energie eoliana in zonele urbane de la viteze ale vantului mai mari de 2m/s cu ajutorul a 72 de microturbine Savonius (exista si varianta cu 63 de turbine) . Astfel se poate folosi o suprafata mare din care sa se extraga energia eoliana cu impact minim asupra mediului urban. Cu o putere de ~30w la 11m/s generata de o turbina Savonius copacul poate produce ~2kW.

https://www.youtube.com/user/NewwindTV
http://www.arbre-a-vent.fr/Nos-realisations_32.html

Decogging generator

Posted on 22 decembrie 2014 by admin

Răspunde

Decogging : Pentru minimizarea efectului de cogging la generatoarele cu flux magnetic radial una din metode este asezarea inclinata a magnetilor sub un unghi (alfa) conform imaginii de mai jos unde :

N=numarul de magneti
ns=numar sloturi stator
L=distanta intre primul si ultimul magnet

Decogging : Folosind aceasta metoda de asezare inclinata a magnetilor efectul de cogging se reduce prin faptul ca in timp ce un magnet din sir este atras de un slot celalalt magnet este atras de urmatorul slot.
Cum se transforma un motor trifazat in generator si asezarea magnetilor pentru minimizarea efectului cogging :
z_conversion_all zubbly2 decogging_tutorial_V1

http://www.sparweb.ca/3_Gen_MoCo/Toshi.html

savonius, darrieus, c-rotor, h-rotor,turbine eoliene cu ax vertical, energie verde, generatoar flux axial, wind turbines, vertical axis wind turbine, wind power, alternative energy, free energy, diy plans, eoliana, hawt, lenz2.

Lenz2 Wind Tunnel

Posted on 6 decembrie 2014 by admin

Răspunde

Un test realizat de Catapul Design in tunelul aerodinamic NASA-Ames Research Facility. In tunelul aerodinamic Lenz2 exceleaza la 9.5 m/s cu un TSR de ~0.6 respectiv un Cp de ~0.35. Curios este ca in test Lenz2 nu depaseste un TSR~1 in conditiile in care o turbina Savonius reuseste. Rezultatele obtinute sunt sub cele a lui Ed Lenz (creatorul turbinei) in tunelul aerodinamic

Turbina eoliana verticala Lenz2 construita de mine nu a depasit randamentul de 0.28

https://www.youtube.com/watch?v=FHfTtwTpJX8

Savonius

Posted on 1 decembrie 2014 by admin

Răspunde

Savonius . Simplitatea designului si faptul ca poate functiona in zone in care viteza vantului este redusa fac ca turbina Savonius sa fie folosita acolo unde costul si fiabilitatea sunt mai importante decat eficienta. Astfel o turbina eoliana verticala de tip Savonius realizata de constructorii polonezi se lauda cu un startup la 0.8 m/s si un timp de operare de 40% in conditiile in care eficienta turbinei depaseste 20%. Ferma eoliana este formata din 3 turbine . Fiecare turbina are inaltimea de 30 de metri si este formata din 9 etaje Savonius (Piskorz)

Savonius : particularitatile constructive ale acestui tip de turbina eoliana verticala sunt descrise in urmatorul brevet : US20140083091.

Noutatea sistemului consta in faptul ca doua turbine sunt cuplate la generatoare electrice iar a treia este cuplata la un compresor de aer. Atunci cand turatia turbinelor cuplate la generatoare tinde sa scada datorita fluctuatiei vitezei vantului, aerul comprimat stocat este injectat in turbine pastrand turatia constanta in punctul cu randament maxim de pe curba de functionare a turbinelor. Este deci vorba de un sistem eolian hibrid similar ca logica de functionare cu sistemele hibride instalate pe autovehicule.

VAWT

Turbine eoliene verticale

Arhive autor: admin

Bobine stator

Lenz2 calculator

VAWT Arduino

VAWT monitorizare parametri functionare cu Arduino

Codul necesar pentru VAWT Arduino .

VAWT online

Definirea parametrilor principali a unei turbine eoliene de mica putere

Eoliana : pentru a calcula aproximativ Rated Power pentru o turbina data puteti folosi : http://vawt.ro/calcul-puterea-generata-de-vawt/

Savonius microturbine

Decogging generator

savonius, darrieus, c-rotor, h-rotor,turbine eoliene cu ax vertical, energie verde, generatoar flux axial, wind turbines, vertical axis wind turbine, wind power, alternative energy, free energy, diy plans, eoliana, hawt, lenz2.

Lenz2 Wind Tunnel

Savonius

Savonius : particularitatile constructive ale acestui tip de turbina eoliana verticala sunt descrise in urmatorul brevet : US20140083091.