The pursuit of reducing energy consumption and enhancing thermal efficiency across various sectors to foster sustainable practices has gained significant prominence in recent years, driven by the global environmental crisis. Sweco consultancy has undertaken a study focusing on underfloor heating systems for bathrooms in low-energy buildings located in Sweden. The objective is to analyse the energy usage and thermal loss to the ground based on the thickness of insulation employed. Literature findings indicate that the thermal loss to the ground should comprise approximately 15 % of the total energy, and there exists a logarithmic relationship between the thermal conductivity and density of the insulation material. In the present study, multiple simulation models were developed using IDA-ICE to assess the supplied energy and the percentage of heating loss through the ground for two typical bathrooms situated on adjacent floors of a residential building in Stockholm. The analysis encompasses scenarios where the construction is directly built on the soil or on a concrete slab, as well as the potential thermal loss from the upper level bathroom to the lower level. The results demonstrate that without an insulation layer the heating loss through the ground is remarkably high, approximately 60 %. When employing an insulation thickness of 200 mm or greater, the distinction between constructing on a concrete slab or on the soil becomes negligible. Furthermore, with a 300 mm insulation thickness, the heating loss percentage decreases to over 15 %. The simulations also reveal that the lower level bathroom can benefit from the energy loss occurring in the upper level bathroom. In instances where there is no insulation, the upper level experiences a 56 % energy loss, resulting in energy savings of over 70 % for the lower level bathroom. By incorporating a 45 mm insulation thickness on the upper level floor, this percentage is reduced to 13 %, leading to energy savings of over 25 % for the lower level bathroom.

This master’s thesis deals with design of different variants of heating and warming of hot service water for holiday building (year-round weekend house, made of bricks). After calculations of the design heat load and heat requirement for heating and warming of hot service water for different types of operations the suitable heat sources are chosen. For heat sources the general design of heating is made. In the end the thesis includes economical analysis for each variant in view of investment and operating costs. The most suitable heat source is chosen from the results of analysis.

This thesis is developed as a proposal for heating for a primary school and kindergarten in the region of Brno-countryside. For the insulated building, a combination of heating and air-conditioning is proposed. The concept is designed so that the air-conditioning preheats the exterior air and the heating system warms the incoming air to a comfortable temperature. For the required thermal performance, sources of heat (for gas and pellets) and a layout solution for the boiler room is designed. Drainage of combustion products is proposed for both solutions. The project solution is per the extent of the construction permit. The theoretical part is linked with the practical part through the condensation boilers, their function and division, and drainage of combustion products. The experiment for the given topic was conducted on the drainage of combustion products. The pressure loss of the reverse knob was determined in relation to the flow rate of air in the condensation boilers as this loss is essential in assessing the drainage of combustion products.