{"id":2325,"date":"2024-02-27T08:58:35","date_gmt":"2024-02-27T08:58:35","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex62\/?page_id=2325"},"modified":"2025-09-12T14:54:40","modified_gmt":"2025-09-12T14:54:40","slug":"la-fontenette","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project62\/case-studies\/la-fontenette\/","title":{"rendered":"La Fontenette"},"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>La Fontenette, Geneva<\/strong><\/p>\n<\/div><\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">A centralized wastewater heat pump with a complementary gas boiler, for a high performance multifamily buildings complex, with heat distribution via a dedicated district heating system.<\/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=\"440\" height=\"322\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch010-building.png\" alt=\"\" class=\"wp-image-2326\" style=\"aspect-ratio:1.3664596273291925;width:484px;height:auto\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch010-building.png 440w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch010-building-300x220.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch010-building-400x293.png 400w\" sizes=\"auto, (max-width: 440px) 100vw, 440px\" \/><\/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>Use of innovative heat pump source (wastewater) in combination with fossil fuels needs careful cooperation of stakeholders regarding the system&#8217;s regulation and its optimization.<\/li>\n\n\n\n<li>Heat pump covers a high share of the heat production with this local heat source.<\/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>2015-2020<\/em><\/td><td>Installed power<\/td><td><em>200 kWth<\/em><\/td><\/tr><tr><td>Heat distribution<\/td><td><em>underfloor heating<\/em><\/td><td>Operation mode<\/td><td><em>bivalent<\/em><\/td><\/tr><tr><td>Heated area<\/td><td><em>30.440 m\u00b2<\/em><\/td><td>Heat source<\/td><td><em>wastewater<\/em><\/td><\/tr><tr><td>No. of apartments<\/td><td>120 (total), <br>17 per building (avg.)<\/td><td><\/td><td><\/td><\/tr><tr><td>Level of insulation<\/td><td><em>High performance<\/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>22 kWh \/ (m\u00b2a)<\/em><\/td><td>DHW demand<\/td><td><em>43 kWh \/ (m\u00b2a)<\/em><\/td><\/tr><tr><td>Heating<br>temperature<\/td><td><em>35 \u00b0C<\/em><\/td><td>Max. temperature<\/td><td><em>63 \u00b0C<\/em><\/td><\/tr><tr><td>SH share<\/td><td><em>37%<\/em><\/td><td>DHW share<\/td><td><em>63%<\/em><\/td><\/tr><tr><td><\/td><td><\/td><td>Type of system<\/td><td><em>central<\/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>Add. heat production<\/td><td><em>Gas boiler (600kW)<\/em><\/td><td>COP<\/td><td><em>&#8211;<\/em><\/td><\/tr><tr><td>PV installation<\/td><td><em>210 kWp<\/em><\/td><td>SPF heat pump<\/td><td><em>3<\/em><\/td><\/tr><tr><td>Investment costs<\/td><td><em>CHF 91.- \/ m\u00b2<\/em><\/td><td><\/td><td><\/td><\/tr><tr><td>Heat Cost (LCOE)<\/td><td>CHF 10.-\/ (m\u00b2a)<\/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 \">While heat pump systems combined with district heating could reduce the CO<sub>2<\/sub> emissions of Geneva\u2019s heating sector, it is crucial to know and control their performance in real condition of use.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">We monitored this new low energy multifamily buildings complex for 3 years.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">SH demand and DHW supply are higher than planned\/normed values. For SH that can be explained by operation conditions which differ from the norm (higher indoor temperatures, window openings), and DHW supply is certainly high, but coherent with a benchmark on other buildings in Geneva.<\/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=\"741\" height=\"455\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch010-scheme.png\" alt=\"\" class=\"wp-image-2328\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch010-scheme.png 741w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch010-scheme-300x184.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch010-scheme-400x246.png 400w\" sizes=\"auto, (max-width: 741px) 100vw, 741px\" \/><\/figure>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Wastewater from the 7 buildings is collected in a common tank (37&nbsp;m<sup>3<\/sup>), which contains: a filtration system to retain and remove the solid materials; as well as an immersed heat exchanger (FEKA system). HP evaporator is connected to this submerged heat exchanger via a glycol-water circuit.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The heat produced by the HP is transferred to a buffer stock. Additional heat is provided by a condensing gas boiler located downstream of the buffer stock. A motorized valve regulates the primary flow through the buffer stock (DH return). Heat is produced in a centralized boiler room and is distributed to the buildings via two heating networks.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">DH supply temperature is set to meet SH needs (max. 40\u00b0C), and raises above 60\u00b0C several times a day to enable DHW production and storage in the buildings. This is done to improve heat production performance (mainly for the HP) and limit distribution losses.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Heat production operates according to the following two regimes:<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<ul class=\"wp-block-list\">\n<li>HP production: this mode is used when the HP and its stock are able to meet the DH demand (in terms of power and temperature).<\/li>\n\n\n\n<li>Gas boiler production (with HP isolated from distribution): this mode is used when HP and its stock can no longer meet DH demand (in terms of power and temperature). In this case, HP is isolated from the boiler and DH to prevent the boiler from heating the stock via DH return. HP then operates in a closed loop, to recharge the buffer stock, and stops when reaching its maximum setpoint temperature.<\/li>\n<\/ul>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Final report: CALLEGARI, Simon Augustin et al. (2021). La Fontenette \u2013 \u00ab&nbsp;Les Aur\u00e9a&nbsp;\u00bb : Analyse technique et sociale d\u2019un complexe d\u2019immeubles HBM de haut standard \u00e9nerg\u00e9tique, \u00e9quip\u00e9 d\u2019une PAC centralis\u00e9e sur eaux us\u00e9es.<br>Url: <a href=\"https:\/\/archive-ouverte.unige.ch\/unige:149374\">https:\/\/archive-ouverte.unige.ch\/unige:149374<\/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\/ch010factsheetla-fontenettev0.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 \">CH010 La Fontenette&nbsp; <\/p>\n<\/div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>La Fontenette, Geneva A centralized wastewater heat pump with a complementary gas boiler, for a high performance multifamily buildings complex,&#8230;<\/p>\n","protected":false},"author":41,"featured_media":0,"menu_order":0,"template":"","filters":[],"markets":[29],"applications":[7,41],"class_list":["post-2325","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\/2325","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\/2325\/revisions"}],"predecessor-version":[{"id":2364,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2325\/revisions\/2364"}],"wp:attachment":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/media?parent=2325"}],"wp:term":[{"taxonomy":"filters","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/filters?post=2325"},{"taxonomy":"markets","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/markets?post=2325"},{"taxonomy":"applications","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/applications?post=2325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}