Foto: Nachhaltiges Wohnungsangebot-Sandgrubenweg

Sol2Pump - High efficient combination of solar thermal plants, photovoltaic and heat pumps

Targeting a high level of decentralised energy supply on basis of renewable energy, the project analyses the possible combinations of solar thermal energy, photovoltaic and heat pumps. The project aims to maximise the domestic energy supply due to utilisation of the building as short term energy storage. In addition to that, several optimisation measures will be developed. The impact on the energy supply and demand will be economically assessed through life cycle costing. On this basis, the potential load transfer and the use of this kind of systems will be evaluated in combination with smart grids.

Short Description




Starting point/motivation

Combinations of heat pump systems and solar thermal units are installed in detached houses as well as in large-scale construction projects. However, the specific matter of photovoltaic as direct power supply for heat pumps remains unanswered.

A major problem with the increased use of air-water heat pumps are the oversizing or the safety margin in size determination. So far, no empirical data about the costs of oversizing over the entire life cycle have been collected yet. Furthermore, there are no evidence-based facts on the "optimal site of the heat pump outdoor unit". The site is mostly determined on visual aspects and not related to effects on the efficient operation of the plant.

Contents and goals

The aim of the project is to measure several systems accurately and to determine the potential for the combination of solar thermal, photo­voltaic and heat pump systems. The building is utilized as short-term heat storage in order to maximise the usages of PV-energy for the operation of the heat pump.


There will be a continuous load profile measurement of 4 buildings with air heat pumps - in combination with solar thermal plants, partially with photovoltaics. Considering the economic as well as the technical facts, planning recommendations will be developed and summarised.

Expected Results

  • Figure of the synergy of PV and heat pumps concerning the self load covering of buildings
  • Analysis of the combination with the building as a short-term heat storage
  • Extraction of realistic experience on the annual coefficient of heat pumps
  • Effects of various smaller optimization measures (hydraulic heating balance, runtime optimization of the heat pump, etc.)
  • Summary of the results in the form of a planning recommendation

Project Partners

Project management

AEE - Arbeitsgemeinschaft ERNEUERBARE ENERGIE NÖ-Wien
Daniel Reiterer M.A. Ing.

Project or cooperation partners

Contact Address

AEE - Arbeitsgemeinschaft ERNEUERBARE ENERGIE NÖ-Wien
Schönbrunnerstraße 253/10
A-1120 Wien
Tel.: +43 (1) 710 75 23 - 15
Fax: +43 (1) 710 75 23 - 18

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