Measurement of selected microclimatic factors

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1 16_Microclimatic_factors.xlsx/Work procedure Measurement of selected microclimatic factors Study group: Year of study: Objective: Determine microclimatic conditions in the classroom. Find out what climatic zone they match up to and whether they match the prescribed values for the laboratory. Tasks: 1. Measure the temperature in the room.. Measure the atmospheric pressure.. Measure the relative humidity of air with hair hygrometer Determine relative humidity of air by psychrometric method by means of a chart and a nomogram. Compare the results obtained in task no. 4 with the relative humidity of air measured by the hair Read the maximum humidity of air for corresponding room temperature from the chart and calculate the absolute air humidity. Use interpolation methods if necessary. 7. Measure the dimensions of the room and calculate its volume in m³. 8. Calculate water vapour mass m in the room for the volume of the room you have currently determined. 9. Compare measured results to standard values found in the literature. 1. Discuss and explain possible differences. Recommended tools and devices: aneroid barometer, room thermometer (liquid or bimetallic), hair hygrometer, Assman psychrometer, August psychrometer, psychrometric chart, psychrometric nomogram Procedure: 1. Work alone.. Measure the atmospheric pressure p with aneroid barometer.. Measure the room temperature t with at least 5 room thermometers located in various places. 4. Measure the relative humidity of air rel with the hair hygrometer. 5. Determine relative air humidity rel by means of Assman psychrometer: a) Insert a strip of gauze into the metal casing of the wet thermometer bulb. b) Drip some distilled water on the gauze so that it shall not overflow into the device. c) Pull the flywheel of the psychometer clockwise. d) Wait 5 6 minutes, until the temperature is stabilized in the "wet" thermometer. Keep the gauze sufficiently wet in the "wet" thermometer. Keep the fan running. e) Read the temperature of the so called dry thermometer t d and wet thermometer t w. f) Determine relative air humidity by means of the psychrometric chart and the nomogram. 6. Determine relative air humidity v by means of August psychrometer: a) Check, whether the gauze on the mercury reservoir of the wet thermometer is damp. b) Read the temperature of so called dry thermometer t d and wet thermometer t w. c) Determine relative air humidity by means of the psychrometric chart and the nomogram. 7. Fill in all entries in the part "Measurement results". 8. Calculate absolute air humidity abs and corresponding water vapour mass m to each determined value of relative air humidity. 9. Explain any differences in temperature at different places. 1. Discuss and explain the obtained results /7

2 16_Microclimatic_factors.xlsx/Work procedure Study group: Year of study: Applied equations: % 1 Note Orange painted cells have to be filled in BEFORE your arrival on practical training. Green painted cells have to be filled during the measurement, or later during protocol processing. Parts of the procedure denoted in italics designate your homework processing measurement results at home /7

3 16_Microclimatic_factors.xlsx/Measurement sheet Measurement of selected microclimatic factors Date of the measurement: I have studied the theory for practical training from: Study group: Year of study: Time of the measurement: (specify a complete bibliographical reference including appropriate chapter and page designation) Used devices and tools: Object of measurement Measurement results: Tab. 1: Recorded atmospheric pressure, air temperature and relative humidity. Atmospheric Location of the barometer pressure Measurement p [mmhg] p [kpa] Air humidity Measurement Air temperature Location of the hair hygrometer Location of the thermometer ϕ rel [%] t [ C] Room dimensions: Width (from the window to the opposite wall): w = cm = m Length (from the door to the opposite wall): l = cm = m Height (from the floor to the ceiling): h = cm = m Volume of the room: V = m /7

4 16_Microclimatic_factors.xlsx/Measurement sheet Study group: Year of study: Tab. : Determination of the relative air humidity by psychrometric method Parameter Assman psychrometer Time elapsed from the beginning of the practical training [min] Locationof the psychrometer Temperature showed by dry thermometer t d [ C] Temperature showed by the wet thermometer t w [ C] Temperature difference Δt= t d t w [ C] chart [%] ϕ rel nomogram [%] ϕ rel Maximum air humidity (according to the table) [g m ] August psychrometer Date and teacher's signature: /7

5 16_Microclimatic_factors.xlsx/Result processing Measurement of selected microclimatic factors Date of the measurement: Used devices and tools: Study group: Year of study: Time of the measurement: 1 1 Object of measurement Results: Tab. 1: Recorded atmospheric pressure, air temperature and relative humidity. Atmospheric p p Location of the barometer pressure [mmhg] [kpa] Measurement 1 ϕ Air humidity Location of the hair hygrometer rel [%] Measurement 1 t Air temperature Location of the thermometer [ C] Tab. : Determination of the relative air humidity by psychrometric method 6 Parameter Time elapsed from the beginning of the practical training [min] Location of the psychrometer Temperature showed by the dry thermometer t d [ C] Temperature showed by the wet thermometer t w [ C] Temperature difference Δt= t d t w [ C] chart [%] ϕ rel nomogram [%] ϕ rel Maximum air humidity (according to chart) [g m ] Assman psychrometer Augustus psychrometer Volume of the room: V = m /7

6 16_Microclimatic_factors.xlsx/Result processing Study group: Year of study: Tab. : Calculated absolute air humidity and water vapour mass. Add correct units. Hair Assman psychrometer Augustus psychrometer hygrometer Chart Nomogram Chart Nomogram Absolute air humidity Water vapour mass Discussion: Physical principle of methods you used to measure temperature, air humidity and atmospheric pressure. Evaluation of measurement conditions and the effect of surrounding environment. (E.g. location of the room, weather.) Explain possible differences of temperature measured at different places in the room and with the dry thermometer of the psychrometer. Explain the impact of the time ellpased from the beginning of the practical training on the recorded values of temperature and humidity. What is the impact of the number of people in the room? What was the weathe? Comparison of determined values of temperature, humidity and atmospheric pressure with "standard" (required) values for laboratory /7

7 16_Microclimatic_factors.xlsx/Result processing Study group: Year of study: Conclusions: Summary of main results and their biophysical interpretation. The importance of determinig the microclimatic factors in medicine and medical research. References: (For example, where did you get the standard values for temperature, atmospheric pressure and relative air humidity from? Cite references in the correct form.) Overall max. 6 Bonus max. Score: Date and signature of the teacher: /7

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