We have developed an energy source for truly almost zero-energy buildings

News, 23/04/2019

The Technological Agency of the Czech Republic supported the development of an advanced energy system for supplying buildings with high energy savings. In addition to researchers from CTU UCEEB, building heating experts from Regulus are also behind it.

The energy system uses the summer production of a photovoltaic power plant to operate a heat pump in conjunction with a low-cost ground storage battery for seasonal heat accumulation between the foundations of the house. Thanks to this, the system achieves more than 80% of the use of renewable resources, significantly reduces electricity consumption and also fulfills the ambitious criteria for evaluating buildings with almost zero energy consumption.

Reducing the need for non-renewable primary energy below 20 kWh/m2 per year meets the recommendations of the European Commission, in which a range of 15 to 30 kWh/m2 is set for the Czech Republic. per year. According to the achieved values, the system shows less than a third of the claim compared to the Czech requirement for the energy efficiency of passive houses, which until now were considered the best in the field of construction. An important aspect is also the economic return, which at current energy prices does not exceed ten years.

In practice, the heat pump is connected via an exchanger made of plastic pipes to a combined heat storage tank for heating and hot water preparation, and at the same time to an underground heat accumulator in the basement of the house. "The heat pump adapts its electrical input to the production of the photovoltaic system. As needed, it takes heat from the surrounding environment with an outdoor air cooler and heats the combined water heat storage tank or stores the heat in an underground accumulator, without using electricity from the grid.

This is mainly used in the winter, when the heat pump takes heat from the ground reservoir at a significantly higher temperature than it is outside, and thus works with much higher efficiency when heating the building," explains Tomáš Matuška from the University Center for Energy-Efficient Buildings of CTU in Prague.

"The excellent results of the project and their introduction into construction practice will contribute not only to reducing the energy demand of buildings, but also to increasing the quality of life of residents and the environment. In addition, the Czech company can prepare well in advance for future market demand and eventually expand to foreign markets with an economically efficient energy system.

The project can immediately be applied on a wide scale and, in addition, it will strengthen the performance and growth of the competitiveness of companies engaged in the construction of buildings and their heating," added Petr Konvalinka, chairman of Technologické agentury ČR, which supported development within the ALFA Program by more than 8.2 millions of crowns.

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