{"id":3030,"date":"2025-03-26T15:19:56","date_gmt":"2025-03-26T15:19:56","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex62\/?page_id=3030"},"modified":"2025-09-12T14:44:02","modified_gmt":"2025-09-12T14:44:02","slug":"de016-pvt-heat-pump-system-for-three-mfbs","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project62\/case-studies\/de016-pvt-heat-pump-system-for-three-mfbs\/","title":{"rendered":"DE016 PVT-Heat-Pump-System for three MFBs"},"content":{"rendered":"\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \" style=\"font-size:25px\">Altbach, Germany<\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The project in Altbach (near Baden-Wurttemberg\u2019s capital of Stuttgart) was completed in 2021. The three multi-family buildings (MFBs) with eight dwellings each and a shared parking garage comprise a total living area of 1753 m\u00b2 and were built to the <em>KfW-55<\/em> standard.<\/p>\n<\/div>\n\n<div class=\"container\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1440\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-buildings-scaled.jpg\" alt=\"\" class=\"wp-image-3031\" style=\"width:838px;height:auto\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-buildings-scaled.jpg 2560w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-buildings-300x169.jpg 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-buildings-1024x576.jpg 1024w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-buildings-768x432.jpg 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-buildings-1536x864.jpg 1536w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-buildings-2048x1152.jpg 2048w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-buildings-400x225.jpg 400w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption class=\"wp-element-caption\">Credits: bwp Bundesverband W\u00e4rmepumpe<\/figcaption><\/figure>\n<\/div><\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><strong>Lessons learned<\/strong><\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<ul class=\"wp-block-list\">\n<li>Running DHW separate from SH allows for more efficiency since in the underfloor heaters, the SH water does not need to be heated to more than 35\u00b0C.<\/li>\n<\/ul>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><strong>Key facts<\/strong><\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"container container--no-margin\">\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td><strong>Building<\/strong><\/td><td><\/td><td><strong>Heat Pump and Source<\/strong><\/td><td><\/td><\/tr><tr><td>Location<\/td><td><em>Altbach,<\/em><br><em>Germany<\/em><\/td><td>Number of HP<\/td><td><em>6 \/2 per building) <\/em><\/td><\/tr><tr><td>Construction<\/td><td><em>2021<\/em><\/td><td>Operation mode<\/td><td><em>monoenergetic<\/em><\/td><\/tr><tr><td>No. of buildings<\/td><td>3<\/td><td>Heat source<\/td><td><em>solar \/ PVT<\/em><\/td><\/tr><tr><td>No. of aparments<\/td><td><em>24 (8 each)<\/em><\/td><td>Type of system<\/td><td><em>central<\/em><\/td><\/tr><tr><td>Level of insulation<\/td><td><em>good<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td>Heated space<\/td><td><em>1753 m\u00b2<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><td><\/td><td><\/td><\/tr><tr><td><strong>Space Heating<\/strong><\/td><td><\/td><td><strong>Domestic Hot Water<\/strong><\/td><td><\/td><\/tr><tr><td>Type of system<\/td><td><em>central<\/em><\/td><td>Type of system<\/td><td><em>central + &#8220;decentral&#8221;<\/em><\/td><\/tr><tr><td>Heating temp.<\/td><td><em>35\u00b0C<\/em><\/td><td>Heating temp.<\/td><td><em>&gt;50\u00b0C<\/em><\/td><\/tr><tr><td>Heat distribution<\/td><td><em>underfloor<\/em><\/td><td>Connection to<br>apartment<\/td><td><em>Fresh Water<br>Stations &#8220;decentral&#8221;<\/em><\/td><\/tr><tr><td>Storage<\/td><td><em>800l<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td><strong>Other information<\/strong><\/td><td><\/td><td><\/td><td><\/td><\/tr><tr><td>Climate Zone<\/td><td><em>Cfb<\/em><\/td><td>Refrigerant<\/td><td><em>R410A<\/em><\/td><\/tr><tr><td>PVT<\/td><td><em>108 collectors<br>(36 per building)<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<\/div><\/div>\n\n\n<div class=\"container\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1021\" height=\"756\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-scheme.png\" alt=\"\" class=\"wp-image-3032\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-scheme.png 1021w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-scheme-300x222.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-scheme-768x569.png 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016-scheme-400x296.png 400w\" sizes=\"auto, (max-width: 1021px) 100vw, 1021px\" \/><\/figure>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><strong>Description of technical details<\/strong><\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Every house has 36 photovoltaic-thermal (PVT) collectors on its roof which feed each building\u2019s two central heat pumps.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The hydraulic connection to the apartments happens via a four-wire system, meaning that there is separate piping for Space Heating (SH) and Domestic Hot Water.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">This improves the total efficiency of the system as the heat pump for the underfloor SH can be run on low-temperature settings. It has a flow temperature of merely 35\u00b0C (max.) and it includes an 800l storage unit in each building.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Domestic Hot Water is provided by each MFB\u2019s other heat pump which heats water to a temperature above 50\u00b0 and transfer the heat to the apartments\u2019 decentral Fresh Water Stations.<\/p>\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"container container--no-margin\">\n<div class=\"wp-block-buttons is-horizontal is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-b989473c wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50 has-custom-font-size is-style-outline has-medium-font-size is-style-outline--1\" style=\"text-transform:none\"><a class=\"wp-block-button__link has-vivid-cyan-blue-color has-white-background-color has-text-color has-background has-text-align-center wp-element-button\" href=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/de016fact-sheet-altbach.pdf\" style=\"border-radius:5px\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"84\" class=\"wp-image-2196\" style=\"width: 300px;\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/fact-sheet-button-pic.png\" alt=\"\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/fact-sheet-button-pic.png 845w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/fact-sheet-button-pic-300x84.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/fact-sheet-button-pic-768x215.png 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/fact-sheet-button-pic-400x112.png 400w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/div>\n<\/div>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"has-text-align-center wp-block-paragraph \"><strong>DE016 &#8211; <strong><strong><strong>PVT-Heat-Pump-System for three MFBs<\/strong><\/strong><\/strong><\/strong><\/p>\n<\/div><\/div>\n<\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Case study delivered by: Bundesverband W\u00e4rmepumpe bwp <a href=\"https:\/\/www.waermepumpe.de\/presse\/referenzobjekte\/bwp-datenbank\/pvt-waermepumpen-anlage-fuer-3-mfh\/\">BWP-Datenbank | Bundesverband W\u00e4rmepumpe (BWP) e.V.<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Altbach, Germany The project in Altbach (near Baden-Wurttemberg\u2019s capital of Stuttgart) was completed in 2021. The three multi-family buildings (MFBs)&#8230;<\/p>\n","protected":false},"author":41,"featured_media":0,"menu_order":0,"template":"","filters":[],"markets":[24],"applications":[7,41],"class_list":["post-3030","case_studies","type-case_studies","status-publish","hentry","markets-germany","applications-buildings","applications-multi-family-buildings"],"acf":[],"_links":{"self":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/3030","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies"}],"about":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/types\/case_studies"}],"author":[{"embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/users\/41"}],"version-history":[{"count":3,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/3030\/revisions"}],"predecessor-version":[{"id":3037,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/3030\/revisions\/3037"}],"wp:attachment":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/media?parent=3030"}],"wp:term":[{"taxonomy":"filters","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/filters?post=3030"},{"taxonomy":"markets","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/markets?post=3030"},{"taxonomy":"applications","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/applications?post=3030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}