{"id":2941,"date":"2025-03-18T12:37:44","date_gmt":"2025-03-18T12:37:44","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex62\/?page_id=2941"},"modified":"2025-09-12T14:32:31","modified_gmt":"2025-09-12T14:32:31","slug":"at005-project-happening-heating-only","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project62\/case-studies\/at005-project-happening-heating-only\/","title":{"rendered":"AT005 PROJECT HAPPENING Heating Only"},"content":{"rendered":"\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\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\">High Replicability Potential for Austria<\/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 \">In the town of Liezen in the very center of the Alpine Republic Austria, the HAPPENING project took part in the renovation of a multifamily building (MFB) with 20 medium sized dwellings. Its insulation envelope had been retrofitted shortly before.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Before the renovation, the individual apartments were heated by various solutions for both Space Heating (SH) and Domestic Hot Water (DHW): from individual gas boilers and radiators to old stoves and electric boilers.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Ownership of the building lies with the non-profit social housing entity GWS.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The apartments required no cooling function in their system but due to the cold winters in the region, reliable heating was all the more a priority.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Because of the \u2018typicalness\u2019 of the MFB, meaning its common kind among building types, there is a high replicability potential.<\/p>\n<\/div>\n\n<div class=\"container\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1976\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-scaled.jpg\" alt=\"\" class=\"wp-image-2942\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-scaled.jpg 2560w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-300x232.jpg 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-1024x790.jpg 1024w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-768x593.jpg 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-1536x1186.jpg 1536w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-2048x1581.jpg 2048w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-400x309.jpg 400w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption class=\"wp-element-caption\">Credits: Project HAPPENING<\/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>Interface coordination was challenging, possibly simplified by processing via a general contractor.<\/li>\n\n\n\n<li>Effort and costs for maintenance, system op. &amp; heating bill is rather high.<\/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>Liezen, Austria<\/em><\/td><td>Number of HP<\/td><td><em>4 x central<\/em><br><em>18 x individual<\/em>*<\/td><\/tr><tr><td>Construction<\/td><td><em>1940<\/em><\/td><td>Operation mode<\/td><td><em>monoenergetic<\/em><\/td><\/tr><tr><td>Project type<\/td><td><em>2022 thermal renovation<\/em><\/td><td>Heat source<\/td><td><em>air, internal loop<\/em><\/td><\/tr><tr><td>Heated area<\/td><td><em>980 m\u00b2<\/em><\/td><td>Type of system<\/td><td><em>central-decentral<\/em><\/td><\/tr><tr><td>No. of apartments<\/td><td><em>20<\/em><\/td><td>Cooling<\/td><td><em>no<\/em><\/td><\/tr><tr><td>Level of insulation<\/td><td><em>good<\/em><\/td><td>Type of system<\/td><td><em>individual HP fed by internal<br>loop fed by central HPs<\/em><\/td><\/tr><tr><td><\/td><td><\/td><td><sub>*two apartments were not included <\/sub><\/td><td><\/td><\/tr><tr><td><strong>Heating sytem<\/strong><\/td><td><\/td><td><strong>Domestic Hot Water<\/strong><\/td><td><\/td><\/tr><tr><td>Heat demand<\/td><td><em>77 kWh\/m\u00b2 per year<\/em><\/td><td>DHW demand<\/td><td>35.7 kWh\/m\u00b2 per year<\/td><\/tr><tr><td>Installed power<\/td><td><em>126 kW<\/em><\/td><td>Max. temperature<\/td><td>55\u00b0C<\/td><\/tr><tr><td>Heating<br>temperature<\/td><td><em>up to 55\u00b0C<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td>Heat distribution<\/td><td>radiators<\/td><td><\/td><td><\/td><\/tr><tr><td><strong>Other information<\/strong><\/td><td><\/td><td><\/td><td><\/td><\/tr><tr><td>COP<sub>decentral<\/sub><\/td><td><em>5.93<\/em><\/td><td>COP<sub>central<\/sub><\/td><td><em>4.06<\/em><\/td><\/tr><tr><td>Refrigerant<sub>decentral<\/sub><\/td><td><em>R32<\/em><\/td><td>Refrigerant<sub>central<\/sub><\/td><td><em>R410A<\/em><\/td><\/tr><tr><td>SPF<\/td><td>2.62<\/td><td>Back-up heater<\/td><td>in all HPs<\/td><\/tr><tr><td>Climate Zone<\/td><td><em>Dfb<\/em><\/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 container--no-margin\">\n<p class=\"wp-block-paragraph \"><strong>Description of the technical concept<\/strong><\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">As part of the HAPPENING project the refurbishment of the building involved installing a new heating system that relied on a central-decentral heat pump (HP) mix.<\/p>\n<\/div>\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\/at005-schemev2.png\" alt=\"\" class=\"wp-image-2985\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-schemev2.png 1021w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-schemev2-300x222.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-schemev2-768x569.png 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-schemev2-400x296.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 \">Centrally, two air-to-water HPs were installed. By means of a Thermal Energy Storage (TES), they feed a low-temperature water-loop (internal loop) inside the building. On the dwelling level, individual HPs use this internal loop as their heat source for both DHW (incl. DHW tank) and SH (partially using the previously existing radiators).<\/p>\n<\/div>\n\n<div class=\"container\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"816\" height=\"612\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-2.jpg\" alt=\"\" class=\"wp-image-2949\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-2.jpg 816w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-2-300x225.jpg 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-2-768x576.jpg 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2025\/03\/at005-building-2-400x300.jpg 400w\" sizes=\"auto, (max-width: 816px) 100vw, 816px\" \/><figcaption class=\"wp-element-caption\">Credits: Project HAPPENING<\/figcaption><\/figure>\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\/at005fact-sheet-liezenv3.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>AT001 &#8211; Project HAPPENING Heating Only, Austria<\/strong><\/p>\n<\/div><\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><\/p>\n<\/div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>High Replicability Potential for Austria In the town of Liezen in the very center of the Alpine Republic Austria, the&#8230;<\/p>\n","protected":false},"author":41,"featured_media":0,"menu_order":0,"template":"","filters":[],"markets":[15],"applications":[7,41],"class_list":["post-2941","case_studies","type-case_studies","status-publish","hentry","markets-austria","applications-buildings","applications-multi-family-buildings"],"acf":[],"_links":{"self":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2941","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":5,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2941\/revisions"}],"predecessor-version":[{"id":3004,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2941\/revisions\/3004"}],"wp:attachment":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/media?parent=2941"}],"wp:term":[{"taxonomy":"filters","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/filters?post=2941"},{"taxonomy":"markets","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/markets?post=2941"},{"taxonomy":"applications","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/applications?post=2941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}