The design of a solar system for the preparation of hot water in an apartment building is analyzed by computer simulation. The analysis shows the effects of the design of the area of solar collectors, climatic conditions, the connection of the circulation circuit and the design of the volume of the solar storage tank on the solar coverage and specific heat gains.

One of the important parameters that are monitored when choosing a battery is the so-called cyclic life. How is this parameter determined and what does it express?

The design of PV systems with regard to the maximum annual yield (total energy obtained per unit of installed capacity) is slowly becoming a thing of the past. Systems with the adaptation of the production diagram to the local consumption consumption diagram and systems with better use of the space required for the installation of the PV array come to the fore.

The subject of the research is a ventilation unit with a heat pump providing vacuum ventilation in a specific family house. The year-round energy balance of the operation was prepared from the obtained parameters. For a total heat loss of 5 kW, the seasonal heating factor SPF of the entire system was evaluated at the level of 2.5.

This article describes a long-term Renewables Power Purchase Agreement under which a consumer purchases renewable electricity directly from an electricity producer. Signing a renewables PPA ensures that the producer acquires the long-term revenue stream through the sale of energy and the costumer gets the fixed electricity price for the entire period of the contract.

Baterries for different applications require different voltage. What conditions determine the voltage for given application and what voltages are specific for concrete battery technologies?

This is a case study of a multifamily residential building that has been environmentally assessed in terms of greenhouse gas (GHG) production using a simplified life cycle assessment (LCA) method. The results of total GHG emissions were compared to the emission limit value, which was set based on the climate objectives of the Paris Agreement and the scientific report The Emissions Gap Report. In response to the non-compliance with the emission limit, a number of emission-saving measures have been proposed and have been suitably designed into variants meeting the emission requirement.

This is a case study of a multifamily residential building that has been environmentally assessed in terms of greenhouse gas (GHG) production using a simplified life cycle assessment (LCA) method. The results of total GHG emissions were compared to the emission limit value, which was set based on the climate objectives of the Paris Agreement and the scientific report The Emissions Gap Report. In response to the non-compliance with the emission limit, a number of emission-saving measures have been proposed and have been suitably designed into variants meeting the emission requirement.

The main topic of this paper was to count the price for 1 kWh of electric energy in a different battery systems. The prices were determined from the datasheets of the manufacturers. The stationary lead acid batteries and LiFeYPO4 batteries are recommended because of their great properties.

What are the requirements for stationary battery storage? What technologies can we use and what we can expect from them?

The paper presents an analysis of PV system usage without a battery storage to cover electricity consumption for single family house with 4 persons and heat pump as a heat source for heating and preparation of domestic hot water. The result of the analysis shows the importance of using a sufficiently short time step of load profiles for correct assessment of solar fraction of PV system. Simplifying chart for fast estimation of solar fraction in a given application (heat pump, user energy) has been developed.

The paper deals with simulation analysis of solar system for domestic hot water preparation for apartment building. The analysis shows the influence of climatic conditions on solar system gains. The aim is to verify whether the level of solar gains can be guaranteed in the Czech Republic's climatic conditions. In discussions over the efforts to guarantee the benefits of a designed and installed solar system, another question arises as to how the total solar radiation changes year-on-year and whether its annual fluctuations can be simply passed on to the solar system's profit.

The authors answer the question how to choose a heat source for a family house built with respect to the current thermal technical requirements. An example is new building of a two-storey family house approximately 20 km south of Brno with a residential part of the house with a square plan of 11 × 11 meters. The evaluation results are compared according to five different criteria.

Photovoltaics has been known for decades, and there have been many discussions about whether and where a power plant with fixed panels or panels with automatic winding to the sun is more economical. While falling panel prices and the latest technical breakthroughs have been progressively sending solar trackers to history, let us try to offer one more idea to the photovoltaic team, who continue to consider trackers as perspective.

The second part of the article on renewable energy sources (RES) in context of the energy balance focuses on the transformation process and final consumption and follows the first part, where RES were introduced as primary energy sources.