{"id":625,"date":"2020-02-10T13:36:12","date_gmt":"2020-02-10T13:36:12","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/annex62\/?page_id=625"},"modified":"2026-03-31T08:06:51","modified_gmt":"2026-03-31T08:06:51","slug":"la-ciotat","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project62\/case-studies\/la-ciotat\/","title":{"rendered":"Senior-Living Building in La Ciotat"},"content":{"rendered":"

The new building in La Ciotat, France, contains 127 apartments on 3 floors. The solar pump maintains a water temperature above 55\u00b0C over the whole year. The construction was finished in May 2018.\"\"<\/p>\n

Key facts<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Building <\/strong><\/td>\n\u00a0<\/td>\nHeat pump and source<\/strong><\/td>\n<\/tr>\n
Location<\/td>\nLa Ciotat, France
<\/em><\/td>\n		\u00a0<\/td>\nNumber of HP<\/td>\n2<\/em><\/td>\n<\/tr>\n
Construction<\/td>\n2017<\/em><\/td>\n\u00a0<\/td>\nInstalled power<\/td>\n2×23 kW<\/td>\n<\/tr>\n
Heat distribution<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\nOperation mode<\/td>\nmonoenergetic<\/em><\/td>\n<\/tr>\n
Heated area<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\nHeat source<\/td>\nsolar panel
<\/em><\/td>\n<\/tr>\n
Level of insulation<\/td>\nnew building<\/em><\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
Heating system<\/strong><\/td>\n\u00a0<\/td>\nDomestic hot water <\/strong><\/td>\n<\/tr>\n
Heat demand<\/td>\n27 kW<\/em><\/td>\n\u00a0<\/td>\nType of system<\/td>\ncentral<\/em><\/td>\n<\/tr>\n
Heating temperature<\/td>\n55 \u00b0C
<\/em><\/td>\n		\u00a0<\/td>\nMax. temperature<\/td>\n65 \u00b0C<\/td>\n<\/tr>\n
\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
Other information <\/strong><\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
Investments 1000 to 1500\u20ac\/appart.<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
Gas fired condensing boiler<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n
The Solar Pump maintains water temperature above 55\u00b0C 365days\/24h. Electrical backup in case of a breakdown.<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n\u00a0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Description of the technical concept<\/strong><\/p>\n

A brine loop circulates between the heat pump\u2019s evaporator and unglazed solar collectors. The evaporator cools down the brine temperature before going back to the solar collector to be heated. The energy transfered by the HP is recovered in the collectors. In sunny conditions, the brine temperature is up to 20\u00b0C above the ambient air temperature. Without sun, the brine temperature is about 5\u00b0C below the ambient air temperature. Wind, rain and humidity (condensation) affect the brine temperature. But 24h\/day \u2013 365d\/year, the Solar Pump harvests its energy in the collector.
Unlike heating, DHW demand is de-correlated from the outside temperatures. As the Solar Pump is connected to a DHW tank, with the storage, the de-correlation and a smart control, the Solar Pump runs as much as possible during the hot sunny hours of the day. This maximizes the COP.
The DHW set point is above 55\u00b0C, to prevent from legionella. The DHW tank is split in two zones: a priority one maintained above 55\u00b0C and a storage one which can be from cold to >55\u00b0C, depending on DHW consumption and the strategy of the control.
Regarding to the piping length and its capacity a hot water loop circulates all day long at 50-55\u00b0C inducing important heat losses. Monitoring shows that the loop\u2019s losses represent 40 to 70% of the annual energy needs. The solar pump compensates the loop\u2019s losses in the tank achieving to double the energy savings.<\/p>\n\n<\/div>

\n

<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

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