Phase-change heat storage installation in combined heat and power plants for integration of renewable energy sources into power system

Experimental investigation on performance of a novel composite desiccant coated heat exchanger in summer and winter seasons

Experimental investigation of alternative robust model predictive control of a heat exchanger

Overheating and indoor air quality in primary schools in the UK

Feasibility study of simultaneous heating and dehumidification using an adsorbent desiccant wheel with humidity swing

The presented research work is aimed at investigation of the influence of indoor environmental conditions on employees in office buildings. Monitoring of carbon dioxide, temperature, relative humidity and pulse, as well as subjective evaluation, was carried out in three office rooms where air conditioning systems ensured the required amount of fresh air. Investigation showed that in two offices (A and B), the amount of fresh air did not comply with EN 15251:2017. The concentration of CO2 in office A was above 1000 ppm for 72% of the total length of stay. Respondents confirmed fatigue and headaches. In offices A and B, where CO2 concentration was around 1000 ppm, people with a weight of up to 70 kg experienced a significant increase in air temperature as well as odor. Persons with weight higher than 75 kg experienced a slight decrease in air quality. In office C, where CO2 concentration was around 800 ppm, respondents reported a slight decrease in air quality. According to pulse monitoring, it can be stated that in an office where there is an insufficient supply of fresh air, the pulse of a person falls or only slightly rises. A decrease in pulses may indicate the attenuation or stunning of people caused by poor air quality.

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Influence of Indoor Climate on Employees in Office Buildings—A Case Study

When reconstructing existing school buildings and building new buildings, great emphasis is placed on increasing their thermal resistance and reducing air tightness. The consequence of these modifications is the reduction of heat flow through the building structure, as well as minimization of uncontrolled ventilation by infiltration through building leaks. According to various studies conducted in the world, it can be said that the exchange of used air for fresh air has a huge impact on the mood of students in the classroom. As part of a research stay at the Lviv Polytechnic, measurements were made in the classroom to determine the air quality during the teaching. The classroom was selected in which measuring instruments were installed for measuring carbon dioxide (CO2) concentration and air temperature. During the measurements didactic classes took place in the classroom. In addition to the measurement of indoor air parameters, a subjective assessment of air quality was carried out using questionnaires. The students filled out the indoor air quality questionnaire at the beginning of their stay in the auditorium at the end of their stay. An assessment of air quality was carried out based on the measured air parameters and questionnaire ratings in the selected classroom.

Investigation of Indoor Air Quality in the Selected Ukraine Classroom – Case Study

The countercurrent heat exchangers can be modeled using analogies from electrical circuits composed of resistors R and capacitators C. Electrical RC analog of the heat exchangers is built and tested. Program MathModelica Lite (MML) in environment OpenModelica (OM) have been used. These are free for academic use.

MathModelica in Modeling of Countercurrent Heat Exchangers

In this paper, the partial results of the investigation of the interrelationship of individual parameters of indoor air - temperature, relative humidity and CO2 concentration, obtained during the experimental measurement, are presented. The experimental measurements have been performed in a selected room, where three separate lessons with three different groups of people have been conducted. During these measurements, the processes of temperature, relative humidity and CO2 concentration have been recorded. Also, people involved in this investigation have made their own evaluation. They, have been asked for opinion about the internal air quality at the beginning and at the end of the experimental measurement.

Examining the Interdependence of the Various Parameters of Indoor Air

Investigation results of condensation phenomena and frost problems in the ventilation heat recuperators are presented. The experiments have been conducted for typical value of indoor temperature 20 o C and a large range of humidity values from 20 to 75% and more of an exhausted air. The heat exchanger worked in the real conditions of the winter climate in Bialystok.

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Mariusz Adamski

Papers

Influence of Indoor Climate on Employees in Office Buildings—A Case Study

Investigation of Indoor Air Quality in the Selected Ukraine Classroom – Case Study

MathModelica in Modeling of Countercurrent Heat Exchangers

Examining the Interdependence of the Various Parameters of Indoor Air

Condensation phenomena and frost problems in the air heat recuperators