{"id":2332,"date":"2024-02-27T09:14:23","date_gmt":"2024-02-27T09:14:23","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex62\/?page_id=2332"},"modified":"2025-09-12T14:55:11","modified_gmt":"2025-09-12T14:55:11","slug":"laurana","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project62\/case-studies\/laurana\/","title":{"rendered":"Laurana"},"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\">\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\"><strong>Laurana, Geneva<\/strong><\/p>\n<\/div><\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Renovation of a Domestic Heat production plant coombining gas boilers with a heat pump for flue gas heat recovery and geothermal heat production via a borehole field.<\/p>\n<\/div>\n\n<div class=\"container\">\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"437\" height=\"271\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch011-building.png\" alt=\"\" class=\"wp-image-2333\" style=\"aspect-ratio:1.6125461254612545;width:471px;height:auto\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch011-building.png 437w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch011-building-300x186.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch011-building-400x248.png 400w\" sizes=\"auto, (max-width: 437px) 100vw, 437px\" \/><\/figure>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><strong>Lessons learned&nbsp;<\/strong><\/p>\n<\/div><\/div>\n\n\n<div class=\"container container--no-margin\">\n<ul class=\"wp-block-list\">\n<li>Domestic Heat return temperature is a key factor for heat pump integration on a DH network.<\/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>Geneva, Switzerland<\/em><\/td><td>Number of HP<\/td><td><em>1<\/em><\/td><\/tr><tr><td>Construction<\/td><td><em>1960, renov. 2012<\/em><\/td><td>Installed power<\/td><td><em>340 kWth<\/em><\/td><\/tr><tr><td>Heat distribution<\/td><td><em>radiators<\/em><\/td><td>Operation mode<\/td><td><em>bivalent<\/em><\/td><\/tr><tr><td>Heated area<\/td><td><em>100.000 m\u00b2<\/em><\/td><td>Heat source<\/td><td><em>flue gas recovery,<br>ground<\/em><\/td><\/tr><tr><td>No. of apartments<\/td><td><em>&#8211;<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td>Level of insulation<\/td><td><em>None\/poor<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td><\/td><td><\/td><td><\/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>32 kWh \/ (m\u00b2a)<\/em><\/td><td>DHW demand<\/td><td><em>32 kWh \/ (m\u00b2a)<\/em><\/td><\/tr><tr><td>Heating<br>temperature<\/td><td><em>60 \u00b0C<\/em><\/td><td>Max. temperature<\/td><td><em>60 \u00b0C<\/em><\/td><\/tr><tr><td>SH share<\/td><td><em>69 %<\/em><\/td><td>DHW share<\/td><td><em>31%<\/em><\/td><\/tr><tr><td>Add. heat <br>production<\/td><td><em>gas boilers (9.8 MW)<\/em><\/td><td>Type of system<\/td><td><em>central per building<\/em><\/td><\/tr><tr><td><\/td><td><\/td><td>Circulation system<\/td><td><em>Yes<\/em><\/td><\/tr><tr><td><\/td><td><\/td><td><\/td><td><\/td><\/tr><tr><td><strong>Other information<\/strong><\/td><td><\/td><td><\/td><td><\/td><\/tr><tr><td>HP share<\/td><td><em>14%<\/em><\/td><td>COP<\/td><td><em>&#8211;<\/em><\/td><\/tr><tr><td>Gas boilers share<\/td><td><em>86%<\/em><\/td><td>SPF<\/td><td><em>3<\/em><\/td><\/tr><tr><td>Investment costs<\/td><td><em>CHF 120.- \/ m\u00b2<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td>Heat Cost (LCOE)<\/td><td><em>CHF 22.-\/ (m\u00b2a)<\/em><\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">This study concerns the renovation in 2011 of an existing DH plant and the extension of its DH, supplying 18 substations. The renovation implied the replacement of three oil boilers (cumulated power of 3.3 MW) by three new gas boilers (cumulated power of 9.8 MW, with a two-stage heat recovery system) and a dual source HP with a thermal power of 0.34 MW. The HP sources are geothermal (borehole field of 44 heat exchangers of 300m) and gas (waste heat recovered from the vapour condensate of the gas boiler).<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The extended DH (\u201cLaurana\u201d and \u201cTrois-Ch\u00eanes\u201d sectors combined) has a high linear density (7.3 MWh\/m\/year) and is responsible for the heat delivered to approximately 100\u2019000&nbsp;m<sup>2<\/sup> of heated surface, with 2\u2019500 inhabitants, for 7 MW of subscribed power.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">This renovation intended to use a borehole field as seasonal storage for flue gas waste heat recovery, which would allow the shutdown of gas boilers in summer. In reality, the gas boilers continue working throughout the summer, limiting energy extraction from the boreholes as well as seasonal storage.<\/p>\n<\/div>\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\">\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"632\" height=\"440\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch011-scheme.png\" alt=\"\" class=\"wp-image-2334\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch011-scheme.png 632w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch011-scheme-300x209.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch011-scheme-400x278.png 400w\" sizes=\"auto, (max-width: 632px) 100vw, 632px\" \/><\/figure>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">In this system, heat production for both DH (\u201cTrois-Ch\u00eanes\u201d and \u201dLaurana\u201d) is provided by a set of gas boilers (total of 9.8&nbsp;MW), complemented with a HP (340&nbsp;kW<sub>th<\/sub>). There are two heat sources for the HP: flue gas heat recovery from the gas boilers and a geothermal borehole field (44 probes of 300&nbsp;m deep).<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Heat recovery from flue gas condensation, which takes place at a temperature too low to be used directly on the networks, is routed to a reservoir at tepid temperature. This heat is used either directly as a heat source for the HP, or to recharge the geothermal probes, which constitute the second heat source for the HP.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The HP heat production feeds the return flow of the \u201cLaurana\u201d DH, via a buffer tank, which enables the management of the different flow rates between HP and DH (hydraulic separation). Mixed with that of \u201cTrois-Ch\u00eanes&#8221;, the return flow from \u201cLaurana\u201d DH finally goes back to the gas boilers, which supply the additional heat needed to reach the supply temperature needed on these two DH.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">DH supply\/return temperatures here are typically 75-65\u00b0C\/55\u00b0C.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Final report: FAESSLER, J\u00e9r\u00f4me et al. (2016). R\u00e9seaux thermiques multi-ressources efficients et renouvelables : Retour d\u2019exp\u00e9rience sur la r\u00e9novation de la chaufferie de quartier de Laurana-Parc \u00e0 Th\u00f4nex (GE).<br>Url: <a href=\"https:\/\/archive-ouverte.unige.ch\/unige:93169\">https:\/\/archive-ouverte.unige.ch\/unige:93169<\/a><\/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\/2024\/02\/ch011factsheetlaurana.pdf\" style=\"border-radius:5px\" target=\"_blank\" rel=\"noreferrer noopener\"><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 \">CH011 Laurana&nbsp; <\/p>\n<\/div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Laurana, Geneva Renovation of a Domestic Heat production plant coombining gas boilers with a heat pump for flue gas heat&#8230;<\/p>\n","protected":false},"author":41,"featured_media":0,"menu_order":0,"template":"","filters":[],"markets":[29],"applications":[7,41],"class_list":["post-2332","case_studies","type-case_studies","status-publish","hentry","markets-switzerland","applications-buildings","applications-multi-family-buildings"],"acf":[],"_links":{"self":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2332","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":2,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2332\/revisions"}],"predecessor-version":[{"id":2363,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2332\/revisions\/2363"}],"wp:attachment":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/media?parent=2332"}],"wp:term":[{"taxonomy":"filters","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/filters?post=2332"},{"taxonomy":"markets","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/markets?post=2332"},{"taxonomy":"applications","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/applications?post=2332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}