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01-2016 Wandheizungen

Energiespartip 12/01 2016

Wandheizungen

 

Wandheizungen geben ihre Wärme mit einem relativ hohen Strahlungsanteil ab. Dadurch entsteht ein angenehmes Raumklima und geringe Staubverwirbelung. Durch subjektiv empfundenes Wärmegefühl bei objektiv etwas niedrigeren Raumtemperaturen sind Energieeinsparungen möglich (im Vergleich geringere Vorlauftemperatur). Bei einer Oberflächentemperatur der Wand von 24 bis 29 °C wird die Strahlungswärme als angenehm empfunden. Generell gilt: Je geringer die Differenz zwischen der durchschnittlichen Raumtemperatur und der Oberflächentemperatur einer Außenwand, desto behaglicher fühlt man sich in diesem Raum. Bei gleicher Oberflächentemperatur wird eine Abstrahlung der Wand als angenehmer empfunden als die einer Fußbodenheizung.

Außenwände müssen eine genügende Wärmedämmung aufweisen. Bei schlecht gedämmten Außenwänden sind die Transmissionswärmeverluste hoch, sodass mit hohen Energiekosten zu rechnen ist. Als Richtschnur gilt ein U-Wert (früher k-Wert) von < 0,35 W/m²K, bei Altbauten gibt man sich schon mit < 0,5 W/m²K zufrieden. Unter bestimmten Voraussetzungen lässt sich z. B. bei Altbauten, Fachwerkhäusern, etc., eine Wärmedämmung nachträglich innen aufbringen, wenn diese wasserdampfundurchlässig gestaltet wird.

Eine Anbringung der Wandheizung an Innenwänden ist energetisch sinnvoller, an Außenwandinnenseiten physiologisch vorteilhafter.

Wandheizungen werden entsprechend der Heizwärmebedarfsberechnung geplant. Allgemein geht man dabei von folgenden Annahmen aus:

Die Vorlauftemperatur liegt bei Wärmepumpen 35 °C, bei sonstigen Heizquellen 40 °C maximal 80 °C (bei heiß eingeputztem Lehmputz auch höher),

  • Raumtemperatur 20 °C für normale Räume und 24 °C für Badezimmer,

  • die Oberflächentemperatur der Wände sollte 40 °C nicht überschreiten,

 

Die Heizleistung liegt bei Mehrschichtverbundrohre von 16 mm Durchmesser im Abstand von 10 cm verlegt und in 30 bis 35 mm Putz eingebettet bei etwa 85 W/m², wenn die Vorlauftemperatur 35 °C beträgt; dabei enthält 1 m² dieses Systems ca. 1 Liter Wasser. Im Allgemeinen muss man immer die Heizgrenzkurve in Betracht ziehen. Bei einer Wandheizung liegt die Heizgrenzkurve bei ca. 160 W/m².

 

Die Wandheizung erfordert eine genaue Planung. Wichtig dabei sind die entsprechenden Stellflächen für Möbel etc., um in den entsprechenden Jahreszeiten den Wärmebedarf des Raumes abdecken zu können. Verstellen von Heizflächen macht das System träger (wie z. B. Teppich auf Fußbodenheizung). Außenwand-Anordnungen sind in dieser Hinsicht weniger empfindlich. Die Lage der Rohre sollte dokumentiert werden (Foto mit Metermaß); denn eine Beschädigung der Rohre durch z. B. einen Bildernagel kann zu Wasserschäden führen. Zur nachträglichen Feststellung gibt es auch temperaturabhängig farbverändernde Folien, Metallsucher, etc. mit denen durch einfaches Auflegen auf die Wand die Rohrlage kontrolliert werden kann.

 

Ein frohes Weihnachtsfest und einen guten Rutsch ins neue Jahr wünscht das Team von der Agenda 21, Energie und Rohstoffe.

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  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `ja391_categories` AS `s` INNER JOIN `ja391_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray2,:preparedArray3)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`1.86ms5.22KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM ja391_fields AS a LEFT JOIN `ja391_languages` AS l ON l.lang_code = a.language LEFT JOIN ja391_users AS uc ON uc.id=a.checked_out LEFT JOIN ja391_viewlevels AS ag ON ag.id = a.access LEFT JOIN ja391_users AS ua ON ua.id = a.created_user_id LEFT JOIN ja391_fields_groups AS g ON g.id = a.group_id LEFT JOIN `ja391_fields_categories` AS fc ON fc.field_id = a.id WHERE ( (`a`.`context` = :context AND (`fc`.`category_id` IS NULL OR `fc`.`category_id` IN (:preparedArray1,:preparedArray2,:preparedArray3)) AND `a`.`access` IN (:preparedArray4)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray5)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC2.09ms5.97KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `ja391_categories` AS `s` INNER JOIN `ja391_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray2,:preparedArray3)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`1.15ms5.22KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT custom_data FROM ja391_extensions WHERE element = 'yootheme' AND folder = 'system' LIMIT 1756μs856B/templates/yootheme/packages/platform-joomla/src/Storage.php:30Copy
  • SELECT `language`,`id` FROM `ja391_menu` WHERE `home` = '1' AND `published` = 1 AND `client_id` = 0855μs912B/libraries/src/Language/Multilanguage.php:123Copy
  • SELECT `alias` FROM `ja391_content` WHERE `id` = :id354μs1.63KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `ja391_content` WHERE `id` = :id405μs1.63KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `c2`.`language`,CONCAT_WS(':', `c2`.`id`, `c2`.`alias`) AS `id`,CONCAT_WS(':', `ca`.`id`, `ca`.`alias`) AS `catid` FROM `ja391_content` AS `c` INNER JOIN `ja391_associations` AS `a` ON `a`.`id` = `c`.`id` AND `a`.`context` = :context INNER JOIN `ja391_associations` AS `a2` ON `a`.`key` = `a2`.`key` INNER JOIN `ja391_content` AS `c2` ON `a2`.`id` = `c2`.`id` INNER JOIN `ja391_categories` AS `ca` ON `c2`.`catid` = `ca`.`id` AND `ca`.`extension` = :extension2 WHERE `c`.`id` = :id AND c2.access IN (1) AND c2.language != 'de-DE' AND (c2.publish_up IS NULL OR c2.publish_up <= '2025-04-08 03:33:18') AND (c2.publish_down IS NULL OR c2.publish_down >= '2025-04-08 03:33:18') AND c2.state = 1573μs1.78KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `ja391_modules` AS `m` LEFT JOIN `ja391_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `ja391_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) AND `m`.`language` IN (:preparedArray2,:preparedArray3) ORDER BY `m`.`position`,`m`.`ordering`1.17ms2.28KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM ja391_fields AS a LEFT JOIN `ja391_languages` AS l ON l.lang_code = a.language LEFT JOIN ja391_users AS uc ON uc.id=a.checked_out LEFT JOIN ja391_viewlevels AS ag ON ag.id = a.access LEFT JOIN ja391_users AS ua ON ua.id = a.created_user_id LEFT JOIN ja391_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`access` IN (:preparedArray1)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray2)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) ORDER BY a.ordering ASC1.2ms5.22KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT SUM(`hits`) AS count_hits FROM `ja391_content` WHERE `state` = 11.65ms856B/modules/mod_stats/src/Helper/StatsHelper.php:128Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM ja391_fields AS a LEFT JOIN `ja391_languages` AS l ON l.lang_code = a.language LEFT JOIN ja391_users AS uc ON uc.id=a.checked_out LEFT JOIN ja391_viewlevels AS ag ON ag.id = a.access LEFT JOIN ja391_users AS ua ON ua.id = a.created_user_id LEFT JOIN ja391_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`context` = :context AND `a`.`access` IN (:preparedArray1)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray2)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC1.94ms16.28KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT SUM(CASE WHEN `a`.`next_execution` <= :now THEN 1 ELSE 0 END) AS due_count,SUM(CASE WHEN `a`.`locked` IS NULL THEN 0 ELSE 1 END) AS locked_count FROM `ja391_scheduler_tasks` AS `a` WHERE `a`.`state` = 1644μs1.68KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:517Copy
  • SELECT `session_id` FROM `ja391_session` WHERE `session_id` = ?534μs1.63KBParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:291Copy
  • UPDATE `ja391_session` SET `data` = ? , `time` = ? WHERE `session_id` = ?3.43ms912BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:318Copy