The following code will add a meta tag in the head of the html to automatically refresh Drupal page in browser.

You can add the following code to your theme’s hook_preprocess_page in the template.php file to add a meta tag that will refresh the browser every 15 minutes. In this case I needed it for the home page only so I have a condition in the preprocess hook.

 * Implements hook_preprocess_page().
function YOURTHEME_preprocess_page(&$variables) {

  // Test for Homepage and add meta tag to head
  if (drupal_is_front_page()) {
      '#tag' => 'meta',
      '#attributes' => array(
        'http-equiv' => 'refresh',
        'content' => 60*15,
      )), 'refresh-page');