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Functioning Efficiency of the Central Air-Conditioning System on the Selected Example

Szlązak Nikodem, Swolkień Justyna

New Trends in Production Engineering

2020

Vol. 3, Iss. 1

41--55

One of the particularly significant threats during exploitation is the climatic threat, which is associated with an increase in the overall costs that are allocated to combating it. The rise in the virgin temperature of the rock mass by 1oC increases the demand for the required cooling capacity to be taken from the air. The publication assesses the effectiveness of the air-conditioning installation by testing its operation on a selected example. The assessment of the efficiency of the air-conditioning installation for a selected hard coal mine showed that none of the five tested coolers achieved the maximum assumed rated power. The use of total power (7.5 MW) in mining excavations was less than 50% and amounted to η = 0.472%. The research showed that the main reason for obtaining low cooling parameters is the inability to locate them in the place of the highest air temperatures. The other problem is an insufficient airflow rate of cooling water supplied to the coolers at too high temperature. The above considerations indicated that the cooling power from built-in air- conditioning systems is not properly and effectively used. Improving the efficiency of its functioning is possible by proceeding research that will eliminate the above factors and by using air conditioning equipment, taking into account the periodic audit of their work to reduce electricity consumption.

Metody wyznaczania zapotrzebowania na energię budynku zgodnie z normą PN-EN ISO 52016-1

Narowski Piotr

Materiały Budowlane

2019

nr 1

14--18

Wycofana norma PN-EN ISO 13790 została zastąpiona normą PN-EN ISO 52016, która określa wiele metod obliczeniowych zapotrzebowania na energię budynków do ich ogrzewania, chłodzenia, nawilżania i odwilżania powietrza wewnętrznego, obliczania bilansu energii i wyznaczania temperatury wewnętrznej w budynkach oraz wyznaczania zapotrzebowania na moc ogrzewania i chłodzenia. W artykule opisano metody obliczeniowe zawarte w tej normie oraz omówiono związki pomiędzy tą normą i normą PN-EN ISO 52017 oraz innymi powołanymi normami. W artykule przedstawiono również różnice metod obliczeniowych wycofanej normy PN-EN ISO 13790 i normy omawianej w artykule.

The with drawn PN-EN ISO 13790 standard has been replaced by the PN-EN ISO 52016 standard, which contains a number of calculation methods for energy demand of buildings for heating, cooling, humidifying and dehumidifying indoor air, calculating the energy balance and determining the indoor temperature in buildings and determining the heating and cooling loads. The article describes the calculation methods contained in this standard and discusses the relationship between this standard and the PN-EN ISO 52017 standard and other referenced standards. The article also presents the differences in the calculation methods of the withdrawn PN-EN ISO 13790 standard and the standard discussed in this work.