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Monitoring of air temperature, humidity, and CO2 concentration, слайд №1

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Monitoring of air temperature, humidity, and CO2 concentration 1.2.2017 Marianna Luoma

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Monitoring excercise; instructions Aim: To learn to design, perform, and report a monitoring activity Physical quantities to be measured: Air temperature and relative humidity Absolute humidity should be calculated Optional: CO2 concentration Alternative 1: Using data loggers for monitoring: Data logger EBI 20, that should be programmed by means of a PC Monitoring of air temperature and humidity You should use at leat two data loggers Alternative 2: Using a Grant squirrel multichanel data logger Monitoring air and surface temperatures at 8 locations The data logger is used together with a portable PC (available in the lab) Sampling duration: At least 24 hours Groupwork: One or two students in the group (monitoring of temperature and humidity) Two students in the group (monitoring of temperature, humidity and CO2 concentration)

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Optional We will study air flow rates and CO2 concentarions later in this course You could measure the air flow rates in the room in which you do the monitoring, however you need to learn how to measure You could compare the measured air flow rates to the design values in D2 If you monitor also CO2 concentrations, and know the number of persons present, you could do some further analysis of the ventilation in the room

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Example of monitoring in an office room * Think what kind of variation you could expect in temperature and humidity * Constant values are not very interesting results

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Memory capacity of the EBI 20 data loggers 8000 measured data (temperature and humidity takes two) The unit provides different recording modes The desired recording mode is set by the PC Endless measurement Immediate measurement until memory is full No measurement/start by pressing key Start/stop measurement

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Comparison of the two EBI 20 data loggers The data loggers that you have, may show different values for temperature and humidity You should correct for that difference, when you analyze your sampling data This is how you should do: When you are starting your sampling, put the loggers first at the same location (at a table side by side) and let them be there for an hour Use this data to correct the results so that your loggers show the same results at the same location

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Grant squirrel multichannel data logger Each sensor has a long cabel Suggestions for measuring activities: Do a comparison of the sensors, since this data logger is new and we do not yet have information about its characteristics. Study operative temperature, since one of the sensors could be installed inside a globe thermometer. Study the efficiency of the heat recovery of Building A by monitoring the temperatures in various locations in the air handling unit.

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Measuring CO2 concentarion

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Selecting the topics and reserving the instruments Tuesday 7th of February: Each group tells, what and where they are going to monitor Reserving the data loggers: Send an e-mail to the laboratory engineer keijo.piirainen@xamk.fi to reserve the loggers. Tell in the e-mail about which instruments you need, when you want to get the instruments and instructions to use them, and when you will return them. Save the monitoring results to your own memory stick You need to do a PowerPoint file which has to be returned on the 19th of March in Moodle (detailed instructions for the report will be given later)

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Oral presentations Presentations should be in a PowerPoint file Oral presentations are held on Tuesday the 21st of February The data should be shown in averages and in graphs (done with Excel) Absolute humidities should be calculated and shown together with the air temperature and relative humidity CO2 concentrations should be shown Photos of the monitoring are desirable

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Suggestions for monitoring Residence, indoor and outdoor conditions Residence, conditions in different rooms Residence, conditions at different heights Conditions inside a refrigerator or freezer Class room, conditions during the day, at different heights or at different locations in the room Something else that interests you? Swimming hall, gym, department store… Conditions inside a car When you put the data logger outside, make sure that it does not get wet (snow, rain…) or stolen.

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Start with these questions: With whom do you work? The aim of the measurements? When do you measure? Where do you measure? Which data loggers you are going to use? How many loggers do you need? For how long do you monitor? (at least 24 hours) How often do you store the data (s, min, h)? What kind of results do you expect to get? How would you analyze the results? Comparison of the reults to D2, standards etc.?