Practices

Heat pumps replace electrical heating

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Retrofit with energy-efficient inverter heat pumps replaces electrical night storage heating in multistorey flats in Essen, Germany. Monovalent airto- air heat pump heating using aerothermal renewable energy represents 72% savings on tenants’ energy bill in Essen retrofit project which is labelled with 30kWh/m² without extra exterior wall insulation.

Lessons learnt

When renovating or building new multi-family housing projects without a heat distribution system, inverter heat pumps offer an economical, hassle-free, state-of-the-art and proven solution using aerothermal renewable energy. They permit unprecedented savings on the operating cost, while offering functions that conventional heating systems simply don’t have. The measured savings in the Essen project amounted to more than 70% for both energy consumption and energy cost, and clearly show the advantages offered by heat pump technology. These energy savings also translate into annual CO2 savings of more than 28 tonnes per year. The effectiveness of inverter heat pumps is documented by the energy performance certificate for this not insulated building: 30kWh/m².

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1. Christian Zitzelsberger, DAIKIN Airconditioning Germany GmbH, Presentation at the Nürnberg IKK Fair in 2002: Energy Labeling: EC Directive 2002/31/EC 2. Andreas Gernemann, Universität GH Essen, Institut für Thermodynamik und angewandte Energietechnik in publication KKA of February 2001: Study: Temperaturschichtung und Luftgeschwindigkeiten im Raum bei Einsatz von VRV-Direktverdampfungsanlagen mit Inverter-Technik (Temperature stratification and air flow intensity in rooms equipped with inverter-controlled VRV direct expansion systems) 3. Ansgar Thiemann, DAIKIN Airconditioning Germany GmbH, in TAB, October 2002: Minimale Betriebskosten durch hohe Energieeffizienz (Minimum operating costs through high energy efficiency) 4. Ansgar Thiemann, DAIKIN Airconditioning Germany GmbH, in BTE, April 2003: Heizung und Kühlung in einem: Inverter- Wärmepumpe im Ladenlokal für geringe Betriebskosten und Investitionsaufwendungen (All-in-one heating and cooling: inverter heat pump in shops results in low operating costs and investments) 5. Ansgar Thiemann, DAIKIN Airconditioning Germany GmbH, Presentation at the Hannover IKK Fair’s ‘Fachforum’ in 2005: Heating & cooling with air-air-heat pumps