{"id":2307,"date":"2024-02-26T16:30:23","date_gmt":"2024-02-26T16:30:23","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex62\/?page_id=2307"},"modified":"2025-09-12T14:54:04","modified_gmt":"2025-09-12T14:54:04","slug":"la-cigale","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project62\/case-studies\/la-cigale\/","title":{"rendered":"La Cigale"},"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\">\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>Geneva<\/strong><\/p>\n<\/div><\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">A solar assisted heat pump with ice storage ensuring 92% of the heat production for a 19.000m\u00b2 extensively retrofitted multifamily building complex, in combination with a backup gas boiler.<\/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=\"435\" height=\"316\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch009building.png\" alt=\"\" class=\"wp-image-2308\" style=\"aspect-ratio:1.3765822784810127;width:483px;height:auto\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch009building.png 435w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch009building-300x218.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch009building-400x291.png 400w\" sizes=\"auto, (max-width: 435px) 100vw, 435px\" \/><\/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>Initial issues were largely related to control problems, not to the innovative nature of the technology used.<\/li>\n\n\n\n<li>It is essential to check the conformity of the installation before commissioning.<\/li>\n\n\n\n<li>Ensuring proper energy monitoring leads to overall system improvement.<\/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>2<\/em><\/td><\/tr><tr><td>Construction<\/td><td><em>1952, retrofit 2013<\/em><\/td><td>Installed power<\/td><td><em>1 x 200 kWth<br>1 x 300 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>19,000 m\u00b2<\/em><\/td><td>Heat source<\/td><td><em>unglazed solar collectors<br>ice<\/em><\/td><\/tr><tr><td>No. of apartments<\/td><td><em>273<\/em><\/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>35 kWh \/ (m\u00b2a)<\/em><\/td><td>DHW demand<\/td><td><em>34 kWh \/ (m\u00b2a)<\/em><\/td><\/tr><tr><td>SH share<\/td><td><em>51%<\/em><\/td><td>DHW share<\/td><td><em>49%<\/em><\/td><\/tr><tr><td>Heating<br>temperature<\/td><td><em>45 \u00b0C<\/em><\/td><td>Max. temperature<\/td><td><em>55 \u00b0C<\/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>ST installation<\/td><td><em>yes<\/em><\/td><td>COP<\/td><td><em>&#8211;<\/em><\/td><\/tr><tr><td>Share of direct <br>solar heat<\/td><td><em>14%<\/em><\/td><td>SPF<\/td><td><em>3.2<\/em><\/td><\/tr><tr><td>Share of gas boiler<\/td><td><em>8%<\/em><\/td><td>Ventilation<\/td><td><em>double-flow<\/em><\/td><\/tr><tr><td>Latent heat<br>storage<\/td><td>2.000 kWh<\/td><td>Heating system cost<\/td><td><em>CHF 95.-\/m\u00b2<\/em><\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div><\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Located in Geneva, the cooperative housing complex \u201cLa Cigale\u201d (2&nbsp;building blocks, 273 apartments) was built in 1952. The heating oil consumption of these buildings amounted to approximately 150&nbsp;kWh\/m<sup>2<\/sup>\/y for SH and DHW production.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The buildings were extensively renovated in 2013-2014 in accordance with the <em>Minergie-P<\/em> standard, which was at that time the most important operation of this type in Switzerland.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">This renovation was performed on an occupied site and required use of prefabricated elements (fa\u00e7ades, roof) to achieve quality insulation within short intervention periods; involved transformation of balconies into loggias and installation of a ventilation heat recovery system.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The heat production is mainly provided by unglazed solar collectors covering the south-east and south-west facing roof areas, coupled with a series of HPs using a latent heat storage (water\/ice). Each building has its own independent heat production &amp; distribution system (solar roof, ice\/water storage, one HP + on backup gas boiler).<\/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=\"358\" src=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch009scheme.png\" alt=\"\" class=\"wp-image-2309\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch009scheme.png 741w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch009scheme-300x145.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/75\/2024\/02\/ch009scheme-400x193.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 \">The architecture of the system comprises a brine-to-water HP whose evaporator-side heat source consists of selective unglazed solar collectors on the roof and a phase-change heat stock (ice\/water stock). A heat exchanger also allows direct solar energy use when the solar roof production temperature is high enough (summer &amp; mid-season).<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">On the condenser side of the heat pump, a hydraulic bus to which all components are connected enables heat exchange between heat producers and consumers, maintaining four temperature levels (note that the 4 tubes system is not shown in the diagram above). A storage tank is connected to the end of the bus, enabling energy storage for semi-instantaneous hot water production in the upper section, while the middle section serves as a buffer tank for the heat pump and the lower section is dedicated to solar energy storage.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">To ensure 100% availability of DHW and SH, a backup gas boiler was installed. It was used to produce DHW during the transitional construction period.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Final report: TORNARE, Guy et al. (2017). Rapport technique et de communication du projet d\u2019assainissement Minergie-P des immeubles \u00ab La Cigale \u00bb (GE) \u2013 Chauffage par pompes \u00e0 chaleur solaires coupl\u00e9es \u00e0 des stocks \u00e0 changement de phase. Url: <a href=\"https:\/\/archive-ouverte.unige.ch\/unige:92770\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/archive-ouverte.unige.ch\/unige:92770<\/a><\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Conference paper: HOLLMULLER, Pierre et al. (2017). Solar assisted heat pump with ice storage for a 19\u2032000&nbsp;m<sup>2<\/sup> retrofitted multi-family building complex. In: CISBAT 2017 International Conference.<br>Url: <a href=\"https:\/\/archive-ouverte.unige.ch\/unige:97185\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/archive-ouverte.unige.ch\/unige:97185<\/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\/ch009factsheetla-cigale.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 \">CH009 La Cigale&nbsp; <\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Geneva A solar assisted heat pump with ice storage ensuring 92% of the heat production for a 19.000m\u00b2 extensively retrofitted&#8230;<\/p>\n","protected":false},"author":41,"featured_media":0,"menu_order":0,"template":"","filters":[],"markets":[29],"applications":[7,41],"class_list":["post-2307","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\/2307","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":4,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2307\/revisions"}],"predecessor-version":[{"id":2365,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/case_studies\/2307\/revisions\/2365"}],"wp:attachment":[{"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/media?parent=2307"}],"wp:term":[{"taxonomy":"filters","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/filters?post=2307"},{"taxonomy":"markets","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/markets?post=2307"},{"taxonomy":"applications","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project62\/wp-json\/wp\/v2\/applications?post=2307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}