Three-year measurements of indoor air temperature and relative air humidity in a large office were evaluated for the month of February. The temperatures of the supply heating medium were also assessed.

The requirements for energy efficiency, low installation costs, and thermal comfort can be advantageously met by operation with a relatively low heating water temperature in the winter, or high temperature of the cooling water in the summer when floor, ceiling or wall transfer elements are used.

The article deals with various possibilities and research concepts of controlling heat pumps operating in heating systems. It also presents methods for controlling the thermal performance of heating systems with heat pumps and concludes with recommendations for the most suitable solution.

The resulting value of the heating factor of a combination of two heat pumps, in which the first heat pump is the heat source for the second heat pump, can be determined fairly easily in common technical application practice. The procedure and the resulting formula are given in the article.

The presented set of four communications deals with the risk management in favour of safety applied to the operation of pipelines. It respects current professional knowledge and presents it in the concept promoted by the UN, the European Union, the OECD and others. The fourth part contains a conclusion, characteristics of new aspects addressed by the professional sphere for practice and a list of used literature.

The presented set of four communications deals with the risk management in favour of safety applied to the operation of pipelines. It respects current professional knowledge and presents it in the concept promoted by the UN, the European Union, the OECD and others. The third part summarizes the findings on the checklist methodology and provides examples for pipelines.

The presented set of four communications deals with the risk management in favour of safety applied to the operation of pipelines. It respects current professional knowledge and presents it in the concept promoted by the UN, the European Union, the OECD and others. The second part summarizes the knowledge and principles of risk management and lists the sources of risks for the pipeline.

The presented set of four communications deals with the risk management in favour of safety applied to the operation of pipelines. It respects current professional knowledge and presents it in the concept promoted by the UN, the European Union, the OECD and others. The first part introduces terms used in engineering practice, which deals with risks and safety and introduces knowledge that is relevant to pipeline safety.

Modifications of a large number of older family houses to classification class E or class D energy efficiency can be implemented by measures on the side of the building envelope even without changes to heat sources, if this obligation is introduced. Roughly, it is expected after 2030.

A comparison of the calculation of the volume of the storage tank to boilers with manual application of wood in a family house according to the criteria of subsidy programs and the ČSN EN 303-5 standard shows a relative agreement, respectively the acceptability of the use of both methods. The standard provides a minimum value. In practice, the resulting volume usually consists of two tanks.

The composition of natural gas in the Czech distribution system, or the Czech part of the former Czechoslovak system, has not changed too much over time to date. Almost all of the gas was that supplied from the former Soviet Union and, following its disintegration, from Russia mainly to western European countries and met their requirements. The situation completely changed in 2022 when gas supply from Russia to the EU was reduced and large quantities were replaced with LNG. In this context, the contribution discusses the changes in the composition of the natural gas distributed in the Czech Republic.

Replacing the boiler with a heat pump requires verification of the system's hydraulics, temperature regimes and heat pump performance. Mutual incompatibility can be detected by measuring temperatures, working with equithermal curve graphs and manufacturer's documents, especially in the case of a simpler heating system in a family home.