Abstract
The article presents an economic analysis and comparison of selected (district heating, natural gas, heat pump with renewable energy sources) methods for the preparation of domestic hot water in a building with low energy demand. In buildings of this type increased demand of energy for domestic hot water preparation in relation to the total energy demand can be observed. As a result, the proposed solutions allow to further lower energy demand by using the renewable energy sources. This article presents the results of numerical analysis and calculations performed mainly in MATLAB software, based on typical meteorological years. The results showed that system with heat pump and renewable energy sources Is comparable with district heating system.
Highlights
Low-energy and passive constructions are a result of the introduction of new ideas in building design process. Their main objective is to achieve a significant reduction in demand for non renewable primary energy, necessary to cover the needs of these buildings, mostly related to their heating, ventilation and domestic hot water. [1, 2]
Buildings of this type are characterized by increased demand of energy for domestic hot water preparation in relation to the total energy demand compared to existing buildings
The heat generated by the combustion of natural gas allows quick preparation of domestic hot water with minimal maintenance of the system. [16]
Summary
Low-energy and passive constructions are a result of the introduction of new ideas in building design process Their main objective is to achieve a significant reduction in demand for non renewable primary energy, necessary to cover the needs of these buildings, mostly related to their heating, ventilation and domestic hot water. Application of the above described installations, which use renewable energy sources, can allow to cover a significant demand for electricity, that is required to power the heat pump [4, 5] working for purposes of heating and domestic hot water. Heat demand for hot water purposes in installation with water tank is based on calculation procedure given in Polish standard [9]
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