header("Content-Type: text/html; charset=UTF-8"); 
...

$Eresurs=cp1251_to_utf8($excel->Worksheets(1)->Cells($i,11)->value);
echo "$Eresurs<br>"; 

function cp1251_to_utf8($s){
          $c209 = chr(209); $c208 = chr(208); $c129 = chr(129);
		  $t="";
          for($i=0; $i<strlen($s); $i++)    {
              $c=ord($s[$i]);
              if ($c>=192 and $c<=239) $t.=$c208.chr($c-48);
              elseif ($c>239) $t.=$c209.chr($c-112);
              elseif ($c==184) $t.=$c209.$c209;
              elseif ($c==168)    $t.=$c208.$c129;
              else $t.=$s[$i];
          }
          return $t;
      }

<?php

header("Content-Type: text/html; charset=UTF-8"); 

$var = chr(185); # Код символа № в кодировке CP1251
echo "Code in CP1251 = ".strtoupper(bin2hex($var))." (len=".strlen($var).")<br>";

$var = mb_convert_encoding($var, 'UTF-8','CP1251');
echo "Code in UTF-8 = ".strtoupper(bin2hex($var))." (len=".strlen($var).")<br>";