Decree No. 269/2015 Coll. I consider it one of the worst regulations I have ever encountered. I start from the experience of people who asked me for advice on what to do when they have winter at home and yet the highest share of heating costs in the whole house. At first I bet on the effect of heat parasitizing unoccupied neighboring apartments, but then I thought of looking at positional coefficients.
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.
In the contribution, we are focused on the quality of the heat-moisture microclimate and the aspects that affect it. We chose one office room in the building of the Research Center of the University of Žilina (UNIZA), oriented to the west. The subject of the measurements were all physical components of the indoor environment, the effect of solar radiation through window constructions and floor temperatures using low-temperature radiant floor heating. The contribution describes measuring methods, results of measurements and related partial conclusions for cold climatic conditions of the year.
Unfortunately, the fairness in the allocation of the cost of heating flats in multi-dwelling buildings is most often taken by people who have no idea on what principles the heating of these houses is based. Out of ignorance they then create a problem where it is not at all, and to build a “solution” to construct a bizarre structure. The problem is that the field of heating revolves around the physical quantities of heat and temperature, whose names sound very similar in Czech, and therefore people often confuse them, even though they are completely different in meaning.
The paper deals with the comparison of real energy consumption with values calculated in the Energy Performance Certificate (PENB) for two buildings: New low-energy family house and older apartment building. In both cases, these are wooden buildings. Subsequently, basic differences between the card and the reality in terms of energy consumption are defined in the form of house use coefficients.
Controllers for indoor heating control currently only work with the air temperature that is a controlled variable. At the same time, the main purpose of regulation is to achieve and maintain thermal comfort, which is dependent on more parameters than just the air temperature. The article presents a newly developed virtual air temperature function for heating controllers, which allows heating to be controlled not only by air temperature, but by more standards of thermal comfort. The contribution deals with the description of the principle of the controller function with virtual temperature and brings the evaluation of its benefits and weaknesses.
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.
Ceramic chimney pipes for chimney systems are a traditional and desirable material, mainly due to their high heat and corrosion resistance. In order to reduce CO2 emissions, ie to achieve higher fuel utilization and lower heating costs, but also to reduce CO and dust emissions, ie to increase the purity of flue gas, new boilers for the combustion of solid, liquid and gaseous fuels with higher efficiency. These boilers also use the latent heat of the flue gas and condensate forms in the chimney system. Therefore, higher demands are placed on chimney systems, for resistance to moisture, condensate, but also to reduced gas permeability, which is required for energy passive houses.
The article deals with BIM technology in co-operation with design of HVAC. The theme is divided into two related parts. The first part describes the complex issues related to BIM technology and its implementation in TZB practice. In the second part there is a practical way of comparing the calculation of heat losses according to CSN EN and using the BIM tool.
This section, focusing on the types and characteristics of cables and general information on the issue of electric underfloor heating, closes the series of articles, which showed the basic possibilities that underfloor heating, possibly cooling, offers, what elements it consists of, how it is installed. Those interested in more detailed information can use a number of sources both on TZB-info and on the basis of system suppliers of complete sets of elements, using their free advice, in some cases also free software tools for projection. It is necessary to emphasize at the end that even the best project can be wrongly done by installation, replacement of elements etc.
This section and the remaining two parts of the underfloor heating series are dedicated to a method that has also been used for many years, namely direct conversion of electrical energy into heat in the floor. Also, underfloor heating technology is well processed by component manufacturers and suppliers. Many assembly companies are currently operating in this area, and it is not unusual for builders to install them under the supervision of an expert and self-help. A considerable number of supporters are interested in direct use of electric power for floor heating, especially thanks to the easy and very precise regulation and low purchase costs. This type of underfloor heating does not allow cooling.
The study deals with the measurement of microclimatic (indoor climatic) parameters and questionnaire survey in open-space offices. It describes the building, the air conditioning system and the parameters that have been assessed in the space. The paper shows the problems associated with the assessment of the thermal-humidity microclimate according to the subjective feelings of the occupants. It is an introductory work to the analysis of objective and subjective assessment in the space with uneven thermal-humidity microclimate.
Zone regulation is one of many ways to reduce heating costs. But is this method effective? And how effective is it? Is it worth investing in zone regulation? This paper presents lessons learned from the long-term monitoring of the cost of heating a particular apartment building and compares the impact of different investments on reducing energy consumption. It also deals with the practical operation of zone regulation and the possibilities of using remote access to both its control and the data that zone regulation can provide.
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