CASE STUDY OF VENTILATION PERFORMANCE IN A GENERAL HOSPITAL EXAMINATION ROOM BASED ON CARBON DIOXIDE CONCENTRATION MEASUREMENT

Abstract. Detecting the direction and strength of the causality signal in observed time series is becoming a popular tool for exploration of distributed systems such as Earth's climate system. Here we suggest that in addition to reproducing observed time series of climate variables within required accuracy a model should also exhibit the causality relationship between variables found in nature. Specifically, we propose a novel framework for a comprehensive analysis of climate model responses to external natural and anthropogenic forcing based on the method of conditional dispersion. As an illustration, we assess the causal relationship between anthropogenic forcing (i.e., atmospheric carbon dioxide concentration) and surface temperature anomalies. We demonstrate a strong directional causality between global temperatures and carbon dioxide concentrations (meaning that carbon dioxide affects temperature stronger than temperature affects carbon dioxide) in both the observations and in (CMIP5) climate model simulated temperatures.

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Dependence of Carbon Dioxide Concentration and Relative Humidity in Didactic Room - Case Study

Engineering and Protection of Environment ◽

10.17512/ios.2017.1.2 ◽

2017 ◽

Vol 20 (1) ◽

pp. 17-26

Author(s):

Katarzyna Gładyszewska-Fiedoruk ◽

Antonio Rodero-Serrano

Keyword(s):

Carbon Dioxide ◽

Relative Humidity ◽

Carbon Dioxide Concentration

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The Impact of Carbon Dioxide Concentration on the Human Health - Case Study

Journal of Applied Engineering Sciences ◽

10.2478/jaes-2018-0008 ◽

2018 ◽

Vol 8 (1) ◽

pp. 61-66 ◽

Cited By ~ 5

Author(s):

P. Kapalo ◽

F. Domniţa ◽

C. Bacoţiu ◽

Nadija Spodyniuk

Keyword(s):

Carbon Dioxide ◽

Human Health ◽

Indoor Air ◽

Indoor Environment ◽

Carbon Dioxide Concentration ◽

Carbon Dioxide Production ◽

Human Respiration ◽

Office Rooms ◽

The Impact

Abstract From various other studies, it is known that the maximum carbon dioxide concentration in different countries is between 1,000 ppm up to 1,500 ppm. Therefore, the research is focused on indoor environment, namely the production of pollutants from the persons inside office rooms. The article presents the trend of the carbon dioxide concentration from the occupants inside an office. It is examined the carbon dioxide production separately for men and women, for persons of different mass and for persons of different ages. It is also analyzed the carbon dioxide production during a sedentary and physical activities. In parallel with the production of carbon dioxide is presented the monitoring of the human pulse and blood pressure. All these parameters are monitored together with relative humidity and indoor air temperature. The aims of this paper is to describe the partial results of human respiration impact on indoor air quality in closed spaces and to research the connection between carbon dioxide concentration and human health.

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Practical Impact of the COVID-19 Pandemic on Indoor Air Quality and Thermal Comfort in Kindergartens. A Case Study of Slovenia

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18189712 ◽

2021 ◽

Vol 18 (18) ◽

pp. 9712

Author(s):

Vesna Lovec ◽

Miroslav Premrov ◽

Vesna Žegarac Leskovar

Keyword(s):

Carbon Dioxide ◽

Air Quality ◽

Thermal Comfort ◽

Indoor Air Quality ◽

Air Temperature ◽

Indoor Air ◽

Carbon Dioxide Concentration ◽

Building Stock ◽

Practical Impact

The experimental monitoring of carbon dioxide concentration was carried out in kindergartens in Slovenia, together with indoor air temperature and relative humidity, before and during the COVID-19 pandemic. The aim of the research was to estimate the practical impact of the pandemic on indoor air quality and thermal comfort. The case study sample included buildings with different architectural typology, which are predominantly present in the building stock of Slovenia. The monitoring process lasted for 125 days before and during the COVID-19 pandemic. The results have shown a better indoor air quality in kindergartens during the pandemic, mostly due to ventilation protocols and almost imperceptibly changed indoor air temperature. The COVID-19 pandemic affected air quality in kindergarten classrooms in Slovenia by reducing the average carbon dioxide concentration when children were present in classrooms by 30%.

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Examples of the effects of different averaging methods on carbon dioxide fluxes calculated using the eddy correlation method

Hydrology and Earth System Sciences ◽

10.5194/hess-4-193-2000 ◽

2000 ◽

Vol 4 (1) ◽

pp. 193-198 ◽

Cited By ~ 6

Author(s):

A. D. Culf

Keyword(s):

Carbon Dioxide ◽

Tropical Forest ◽

Carbon Dioxide Concentration ◽

Correlation Method ◽

Eddy Correlation ◽

Background Concentration ◽

Concentration Data ◽

Carbon Dioxide Fluxes ◽

Process Studies

Abstract. Three hours of high frequency vertical windspeed and carbon dioxide concentration data recorded over tropical forest in Brazil are presented and discussed in relation to various detrending techniques used in eddy correlation analysis. Running means with time constants 100, 1000 and 1875s and a 30 minute linear detrend, as commonly used to determine fluxes, have been calculated for each case study and are presented. It is shown that, for different trends in the background concentration of carbon dioxide, the different methods can lead to the calculation of radically different fluxes over an hourly period. The examples emphasise the need for caution when interpreting eddy correlation derived fluxes especially for short term process studies. Keywords: Eddy covariance; detrending; running mean; carbon dioxide; tropical forest

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CFD Analysis on Thermal Comfort and Indoor Air Quality Affected by Partitions in Air-Conditioned Building

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.836.121 ◽

2016 ◽

Vol 836 ◽

pp. 121-126

Author(s):

Pradip Aryal ◽

Thananchai Leephakpreeda

Keyword(s):

Carbon Dioxide ◽

Air Quality ◽

Thermal Comfort ◽

Indoor Air Quality ◽

Indoor Air ◽

Carbon Dioxide Concentration ◽

Average Concentration ◽

Cfd Analysis ◽

Carbon Dioxide Concentrations

This paper presents a CFD analysis on thermal comfort and indoor air quality affected by partitions in an air-conditioned building. CFD experiments are carried out to simulate variables of indoor air before/after installation or removal of partitions. Accordingly, the Predicted Mean Vote (PMV) is determined as an indicator of thermal comfort while the carbon dioxide concentration within an air-conditioned space is used for the assessment of indoor air quality. Some simulated results are validated by measurements with good agreement where a case study is conducted in an air-conditioned space of a library. With the proposed methodology, it can be recommended in a case study that the significant effects of partition on thermal comfort are observed where the area with neutral sensation and slightly-cool sensation reduces significantly. The occupants feel uncomfortably cold after installing partition. The carbon dioxide concentrations slightly increase in some areas but the average concentration remains acceptable according to ASHRAE standard. Without the reinforcement of the air-conditioning units, the installation of partition at the desired location is not encouraged regarding to occupant’s thermal comfort and indoor air quality.

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