Issue 4/2016

The specific rules for the use of FMEA in the field of facility management, especially in the technical management of specific technical equipment, has been defined in the previous parts. This final article of the series follows up, but describes the FMEA methodology implemented on a process. Specifically on an implementation process of CAFM application in a company providing services in the field of technical or comprehensive building management. There are again defined criteria and specified possible issues that could arise in such a CAFM implementation, and what consequences they could have. Obviously it is a very simplified outline of all the potential pitfalls likely to be evaluated by the implementing company in the reality. All the pieces of knowledge and rules are summarized into ten rules in the end, which must be respected during a similar analysis, in order to be successful and achieve a real optimization of operation of technical devices or other processes to be evaluated by this methodology.

The third part of the paper series deals with other systems that are designed for containment (KTM) and hermetically sealed space (HP), and systems for other vital areas of the reactor building, outside the active plant.

There are mandatory regulations for defogging and defrosting systems of car windshield, which have to be met before design approval of any vehicle. However, mere compliance with the legislative requirements is not sufficient, due to the strong competition in the automotive market. In addition, it can not be ignored that the vehicle design is important for its marketability. The ventilation system designer has often very limited options, as the external appearance of the individual interior elements must not be impaired. Therefore, he needs to have the best possible information about the impact of design modifications on the airflow, to find the optimal solution of the ventilation system. Two variants of air outlets for windscreen defrosting are examined in this article, in terms of velocity and turbulence intensity of the incoming airflow. It is analyzed the impact of the grid location on the outlet and subsequently, the recommendations are determined for selection of the most appropriate arrangement of defrosting and defogging systems of car windshield.

The paper presents an example of solving the propagation of noise from an air/water heat pump installed in the basement of an apartment building. Air intake and exhaust are brought out on the façade of the building, where it is calculated the noise situation in the protected exterior of the building. In the interior it is solved the propagation of sound from the plant room to the protected interior space. In conclusion, the results are compared with the data from the report on measurement at the realized work.

The article follows-up on the description of the single stage volumetric compressor. It targets to inform the broader technical community not only about the possibilities and benefits of the compressor modeling, but also about the compressors with special design enabling to suck in the refrigerant vapours from the internal heat exchanger, during the compression of the vapour from the evaporating to the condensing pressure, often referred to as an economizer. Therefore, the article presents not only the brief instructions for creation of the EVI compressor model, but it also compares its energy characteristics with characteristics of a conventional scroll compressor with the same size of the working volume.

The article deals with issue and causes of unpleasant odour of hydrogen sulfide in hot water which is observed in some houses supplied from domestic well. If there is no sulfide present in source water, combination of several factors seems to cause the problem: type of sacrificial anode to prevent corrosion of water heater, chemical composition of water, activity of sulfur bacteria, type of heater, and probable some other. Based on limited information available some remedial measures to solve the problem are sugges ted.

The paper is focused on the issue of the pipeline networks dilatation. From the perspective of the designer, it is a very simple and well-documented issue. However, as is shown in the article, if the basic requirements are not met when designing the pipeline networks, the results can be quite fatal.

The current design process of internal water piping reflects the relation of our society to the drinking water, when the internal water supply system is seen only as a system that conveys water to the users, neglecting the microbial risk. The article explores the causes of the emergence and development of the microbiological contamination in the improper drinking water piping.