{"id":454,"date":"2019-01-29T07:31:17","date_gmt":"2019-01-29T07:31:17","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex50\/?page_id=454"},"modified":"2020-12-11T16:24:46","modified_gmt":"2020-12-11T16:24:46","slug":"daru","status":"publish","type":"page","link":"https:\/\/heatpumpingtechnologies.org\/annex50\/case-studies-1\/daru\/","title":{"rendered":"Daru"},"content":{"rendered":"<div class=\"container container--no-margin classic-editor\">This project concerns the replacement of an existing gas heating system by a hybrid HP+gas solution in an existing multifamily building. With the goal of having the maximum annual heat production from HP origin, six air\/water heat pumps were implemented on the rooftop. One of the previous gas boilers was kept for the peak loads in winter.<\/p>\n<table style=\"height: 181px\" width=\"654\">\n<tbody>\n<tr>\n<td width=\"140\"><a href=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-491\" src=\"\/\/staging.heatpumpingtechnologies.hemsida.eu\/annex50\/content\/uploads\/sites\/56\/2019\/01\/daru2-300x238.jpg\" alt=\"\" width=\"300\" height=\"238\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru2-300x238.jpg 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru2-768x609.jpg 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru2-400x317.jpg 400w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru2.jpg 1007w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/td>\n<td width=\"161\"><a href=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-492 aligncenter\" src=\"\/\/staging.heatpumpingtechnologies.hemsida.eu\/annex50\/content\/uploads\/sites\/56\/2019\/01\/daru3-300x227.png\" alt=\"\" width=\"315\" height=\"238\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru3-300x227.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru3-768x581.png 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru3-400x302.png 400w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2019\/01\/daru3.png 1005w\" sizes=\"auto, (max-width: 315px) 100vw, 315px\" \/><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The existing MFH (multi-family building), built in 1992 in Geneva, contains 68 apartments, within 4 floors, plus commercial establishments on the ground floor (restaurant, bakery, \u2026). It suffered no major envelope retrofit before this project and the total gas consumption amounted to 1\u2019000 MWh\/yr (for space heating and domestic hot water of 7\u2019563m\u00b2). (Photo credit SIG, CSD Ing\u00e9nieurs SA)<\/p>\n<p><span style=\"color: #c00000\"><strong>Lessons learned<\/strong><\/span><\/p>\n<p>Ongoing monitoring, but so far:<\/p>\n<ul>\n<li>Major air HP constraints encountered: noise emissions, vibrations, safety&#8230; These implied important costs and planning work.<\/li>\n<li>Hybrid HP+gas system: optimization of the gas boiler switching point is crutial for a good HP share in the overall heat production (specially with an old boiler without variable power output).<\/li>\n<li>The constraints of the old heat and DHW distribution system should not be underestimated.<\/li>\n<\/ul>\n<p><span style=\"color: #c00000\"><strong>Key facts<\/strong><\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td colspan=\"2\" width=\"300\" height=\"10\"><strong>Building <\/strong><\/td>\n<td width=\"19\"><\/td>\n<td colspan=\"2\" width=\"300\" height=\"10\"><strong>Heat pump and source<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Location<\/td>\n<td width=\"161\"><em>Geneva, Switzerland<br \/>\n<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\">Number of HP<\/td>\n<td width=\"149\"><em>6<\/em><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Construction<\/td>\n<td width=\"161\"><em>1992<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\">Installed power<\/td>\n<td width=\"149\"><em>6 x 30 kW<br \/>\n<\/em><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Heat distribution<\/td>\n<td width=\"161\"><em>radiators<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\">Operation mode<\/td>\n<td width=\"149\"><em>hybrid<\/em><em> (HP + gas)<br \/>\n<\/em><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Heated area<\/td>\n<td width=\"161\"><em>7,563 m\u00b2<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\">Heat source<\/td>\n<td width=\"149\"><em>ambient air<\/em><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Level of insulation<\/td>\n<td width=\"161\"><em>low (1992 standard)<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\">Existing gas boiler<\/td>\n<td width=\"149\">240 kW<\/td>\n<\/tr>\n<tr>\n<td width=\"140\"><\/td>\n<td width=\"161\"><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\"><\/td>\n<td width=\"149\"><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\" width=\"300\"><strong>Heating system<\/strong><\/td>\n<td width=\"19\"><\/td>\n<td colspan=\"2\" width=\"300\"><strong>Domestic hot water <\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Heat demand<\/td>\n<td width=\"161\"><em>700 MWh\/yr<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\">Type of system<\/td>\n<td width=\"149\"><em>central<\/em><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Heating temperature<\/td>\n<td width=\"161\"><em>65 \u00b0C (@ -7\u00b0 ext)<br \/>\n<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\">Max. temperature<\/td>\n<td width=\"149\"><em>60 \u00b0C<\/em><\/td>\n<\/tr>\n<tr>\n<td width=\"140\"><\/td>\n<td width=\"161\"><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\">Circulation system<\/td>\n<td width=\"149\"><em>yes<\/em><\/td>\n<\/tr>\n<tr>\n<td width=\"140\"><\/td>\n<td width=\"161\"><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\"><\/td>\n<td width=\"149\"><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\" width=\"300\"><strong>Other information <\/strong><\/td>\n<td width=\"19\"><\/td>\n<td colspan=\"2\" width=\"300\"><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Electric and gas energy consumption<\/td>\n<td width=\"161\"><em>190 MWh\/yr electric<\/em><\/p>\n<p><em>230 MWh\/yr gas<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\"><\/td>\n<td width=\"149\"><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">Investments costs<\/td>\n<td width=\"161\"><em>unknown<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\"><\/td>\n<td width=\"149\"><\/td>\n<\/tr>\n<tr>\n<td width=\"140\">PV installation<\/td>\n<td width=\"161\"><em>no<\/em><\/td>\n<td width=\"19\"><\/td>\n<td width=\"151\"><\/td>\n<td width=\"149\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #c00000\"><strong>Description of the technical concept<\/strong><\/span><\/p>\n<p style=\"text-align: center\"><a href=\"\/\/staging.heatpumpingtechnologies.hemsida.eu\/annex50\/content\/uploads\/sites\/56\/2020\/12\/darusystem.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-686\" src=\"\/\/staging.heatpumpingtechnologies.hemsida.eu\/annex50\/content\/uploads\/sites\/56\/2020\/12\/darusystem.png\" alt=\"\" width=\"689\" height=\"434\" srcset=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2020\/12\/darusystem.png 898w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2020\/12\/darusystem-300x189.png 300w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2020\/12\/darusystem-768x484.png 768w, https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2020\/12\/darusystem-400x252.png 400w\" sizes=\"auto, (max-width: 689px) 100vw, 689px\" \/><\/a><\/p>\n<p>This project, part of a Geneva pilot program to replace fossil fuel boilers by heat pumps (HP) in MFH, concerns the replacement of a gas heating system by a hybrid HP+gas heating system. With the goal of having a maximum heat production from HP origin, six 30 kW air\/water heat pumps were implemented on the rooftop. For the peak loads in winter, a 240 kW gas boiler was maintained.<\/p>\n<p>It should be mentioned that:<\/p>\n<ul>\n<li>The building rooftop was retrofitted before the HPs were installed. No other retrofit action was undertaken.<\/li>\n<li>The heat and DHW distribution system was not modified.<\/li>\n<\/ul>\n<p>The 6 HPs are divided into 2 groups of 3. 1 group exclusively for space heating, the other can either do space heating or domestic hot water. The gas boiler, when functioning, can work simultanioulsy with the HPs.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><a href=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/56\/2018\/02\/unnamed.png\" alt=\"\" width=\"41\" height=\"41\" \/>Case study sheet CH Daru<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>This project concerns the replacement of an existing gas heating system by a hybrid HP+gas solution in an existing multifamily&#8230;<\/p>\n","protected":false},"author":7,"featured_media":0,"parent":236,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"class_list":["post-454","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/pages\/454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/comments?post=454"}],"version-history":[{"count":6,"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/pages\/454\/revisions"}],"predecessor-version":[{"id":709,"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/pages\/454\/revisions\/709"}],"up":[{"embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/pages\/236"}],"wp:attachment":[{"href":"https:\/\/heatpumpingtechnologies.org\/annex50\/wp-json\/wp\/v2\/media?parent=454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}