Abstract
The article deals with the economic evaluation of investment and optimization of the renewable energy sources for family houses. For example, from the point of view of solar systems, the optimal solution is based on the specific application of it. The design is dependent on the location of the panels and ration between active aperture area and real daytime consumption. Common calculations according to actual standards often give overstated results, which also reflected in the value of the investments. The article shows the research of optimal parameters of the thermal solar system for preparing of domestic hot water. A combination of related standards and software TRNSYS are used to find optimal parameters. Thanks to created and verified simulation models, it is possible to design parameters so as to avoid under-dimensioning or over-dimensioning of the each system. Energy price is another factor affects the payback period of investments. This is affected by the used energy sources and their combination. For example, buildings that use electricity to heat water or heating have different energy charges than a building that uses natural gas. So, the aim is to find optimal solution of the combination of renewable energy sources.
Highlights
Nowadays, the emphasis is placed on the use of renewable energy sources for heating, ventilating and air conditioning systems (HVAC)
Simulations and calculations deal with two possible cases - the reconstruction of a family house using natural gas or electricity as a primary energy source
Case 1: Family house using an old gas boiler. It is a system with the old gas boiler which can be replaced by a new condensing boiler or an electric boiler with a possible combination of renewable energy sources (RES)
Summary
The emphasis is placed on the use of renewable energy sources for heating, ventilating and air conditioning systems (HVAC). These sources have been massively deployed for many years. They are not always designed with respect to the economy of operation and investment. HVAC systems are designed as independent subsystems, regardless of their possible combinations. This all leads to an efficiency decreasing and investment increasing, in some cases. It is advisable to focus on technical and economic optimization at the same time
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