Sustainable energy source for almost zero buildings

Registration number: TA04021243
Provider: Technology Agency of the Czech Republic
Solver: doc. Ing. Tomáš Matuska, Ph.D.
Start: 01.02. 2015
End: 31.12. 2017
Partners: Regulus, sro

Project Objectives

The goal of the project was to develop an advanced energy system for supplying buildings with heat, cold and electricity with high self-sufficiency to achieve the standard of almost zero buildings with an economic return within 10 years with a share of renewable energy sources (RES) of over 70% based on a combination of a heat pump with heat management performance, a combined water tank for heating and hot water preparation and an intelligent controller for system control (in cooperation with the ground tank and the PV system).


In the first year of the project, the concept of an advanced energy system based on a heat pump, a photovoltaic system, a combined storage tank and a low-cost underground storage tank in the basement of the building was designed, and a control strategy of the system was designed. The system solution is protected by a utility model. In the second year of the project, the main elements of the system were developed and constructed in cooperation with the industrial partner Regulus: a ground-to-water heat pump with controlled speed and a superheated steam cooler, a combined heat storage tank with a dividing partition, a ground storage tank and an intelligent controller. The heat pump and the combined storage tank were tested in detail in the UCEEB laboratories of CTU for the validation of mathematical models. Computer simulations of the system for a specific family house were conducted in the TRNSYS environment and control algorithms were derived. During the third year of the project, the system was installed and put into operation in the family house of Hamra near Hlinska. Since autumn 2017, the system has been monitored and evaluated. Data from real operation 2017-2019 confirmed the simulation results. The family house uses RES for heating and hot water preparation at the level of 84%, and the specific need for non-renewable primary energy is at the level of 15 kWh/m2.year, i.e. a quarter of the requirement for passive houses.