Relative Humidity.pdf
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1) The document describes an experiment conducted to measure relative humidity using a wet and dry bulb hygrometer. 2) Students recorded the dry bulb temperature, temperature difference between wet and dry bulbs, and calculated relative humidity every minute for 30 minutes. 3) The mean relative humidity was calculated as 80.84% with a standard deviation of 2.05% based on the recorded measurements.
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Dew point
thermodynamics dew point lab report Generally, hygrometers, or cooled mirrors, have been the conventional air measurement tools used for precise dew point measurement. The device is considered to be a humidity transfer standard. The process entails cooling a mirror until water vapor begins to condense on the surface. The temperature of the mirror is measured. This projects the dew point of the air. This process is generally used in laboratory practices.
A dew-point hygrometer was invented in 1751. For this instrument, cold water was added to water in a vessel until dew formed on the vessel, and the temperature of the vessel, the dew point, provided a direct index of humidity.
In this experiment acetone is used even though the sample is not necessary to be acetone nor the amount of volume matters that becomes vapor so that the temperature (dew point) is measured until the metal mirror starts to condense.
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Relative Humidity Relative humidity (RH) is the ratio between saturated humidity over absolute humidity at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. It requires less water vapor to attain high relative humidity at low temperatures; more water vapor is required to attain high relative humidity in warm or hot air. Relative humidity is normally expressed as a percentage ; a higher percentage means that the air water mixture is more humid ; a lower percentage means that the air-water mixture is less humid.
Relative Humidity (%RH) =𝑭𝑺𝐅𝐀∗%𝟏𝟎𝟎
Absolute humidity is the total mass of water vapor present in a given volume of air. It does not take temperature into consideration. Absolute humidity in the atmosphere ranges from near zero to roughly 30 grams per cubic meter when the air is saturated at 30 °C (86 °F).
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Absolute humidity is the mass of the water vapor divided by the volume of the air and water vapor The absolute humidity changes as air temperature or pressure changes.
The saturation humidity (Hs or FA) is the maximum quantity of water vapor that air can contain at a given temperature, without phase separation. The relative humidity (φ or RH) is the ratio (as percentage) of the partial pressure of water vapor in air, to the vapor pressure of liquid water at the same temperature.
phase change occurs at dew point temperature when the temperature of a gas is the temperature at which the water vapor or low-boiling hydrocarbon derivatives contained in the gas is transformed into the liquid state.
The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapor pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F).
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PERFORMANCE EVALUATION OF TWO STAGE AIR COOLER IN DIFFERENT SPEED
During summer use of khush curtains and water spraid over the khash (fibre) curtain for air cooling is done. But the determination of the extent of cooling is limited up to the wet bulb temperature in Conventional Cooler air is passes at uniform rate through wetted pad. In this process humidity increases sometimes which is not desirable. In Two Stage Air Cooler the primary air is cooled by a contact surface which is maintained at lower temperature air and water on the other side of the contact surface
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A dew-point hygrometer was invented in 1751. For this instrument, cold water was added to water in a vessel until dew formed on the vessel, and the temperature of the vessel, the dew point, provided a direct index of humidity.
In this experiment acetone is used even though the sample is not necessary to be acetone nor the amount of volume matters that becomes vapor so that the temperature (dew point) is measured until the metal mirror starts to condense.
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Relative Humidity Relative humidity (RH) is the ratio between saturated humidity over absolute humidity at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. It requires less water vapor to attain high relative humidity at low temperatures; more water vapor is required to attain high relative humidity in warm or hot air. Relative humidity is normally expressed as a percentage ; a higher percentage means that the air water mixture is more humid ; a lower percentage means that the air-water mixture is less humid.
Relative Humidity (%RH) =𝑭𝑺𝐅𝐀∗%𝟏𝟎𝟎
Absolute humidity is the total mass of water vapor present in a given volume of air. It does not take temperature into consideration. Absolute humidity in the atmosphere ranges from near zero to roughly 30 grams per cubic meter when the air is saturated at 30 °C (86 °F).
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Absolute humidity is the mass of the water vapor divided by the volume of the air and water vapor The absolute humidity changes as air temperature or pressure changes.
The saturation humidity (Hs or FA) is the maximum quantity of water vapor that air can contain at a given temperature, without phase separation. The relative humidity (φ or RH) is the ratio (as percentage) of the partial pressure of water vapor in air, to the vapor pressure of liquid water at the same temperature.
phase change occurs at dew point temperature when the temperature of a gas is the temperature at which the water vapor or low-boiling hydrocarbon derivatives contained in the gas is transformed into the liquid state.
The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapor pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F).
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The document describes an experiment conducted to measure relative humidity and temperature inside a plastic bag containing a plant over the course of an hour, recording measurements every minute. The results show that temperature inside the bag increased over time while relative humidity decreased, with the plastic bag becoming cloudy by the end of the experiment. Students are asked to analyze and discuss the relationship between humidity and temperature observed and factors that influence a plant's transpiration rate.
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During summer use of khush curtains and water spraid over the khash (fibre) curtain for air cooling is done. But the determination of the extent of cooling is limited up to the wet bulb temperature in Conventional Cooler air is passes at uniform rate through wetted pad. In this process humidity increases sometimes which is not desirable. In Two Stage Air Cooler the primary air is cooled by a contact surface which is maintained at lower temperature air and water on the other side of the contact surface
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Relative Humidity.pdf
- 1. Dhaka University Of Engineering & Technology, Gazipur Course Title: Textile Testing & Quality Management-I Course Code: TE-4602(Sessional) Experiment No: 01 Assignment Name: Study on Relative Humidity. Submitted By: Name: MD.MOSADDEK JAMAN Student ID: 175056 Year/Semester: 4th /1st Session: 2020-21 Department: Textile Engineering Signature Date of Performance D M Y Date of Submission D M Y 28 08 2022 04 09 2022 Submitted To: DR SHAFIQUL ISLAM Associate Professor Department: Textile Engineering
- 2. Abstract Humidity is a measure of the amount of water vapor in the air. Humidity is the concentration of water vapor present in the air. So Due to this, Moisture is present in the textile fiber Which affected the textile fiber physical properties. In general the fibres that absorb the greatest amount of moisture are the ones whose properties change the most. In here, Relative Humidity is one of the most important factor for the textile fiber. In this experiment we use wet and dry bulb hygrometer to measure the relative humidity. Theory Relative Humidity(R.H): The ratio of the absolute humidity of the air to that of air saturated with water vapor at the same temperature and pressure expressed as a percentage. Relative Humidity%= 𝐴𝑏𝑠𝑜𝑙𝑢𝑡𝑒 ℎ𝑢𝑚𝑖𝑑𝑖𝑡𝑦 𝑜𝑓 𝑎𝑖𝑟 𝐴𝑏𝑠𝑜𝑙𝑢𝑡𝑒 ℎ𝑢𝑚𝑖𝑑𝑖𝑡𝑦 𝑜𝑓 𝑎𝑖𝑟 𝑠𝑎𝑡𝑢𝑟𝑎𝑡𝑒𝑑 𝑤𝑖𝑡ℎ 𝑤𝑎𝑡𝑒𝑟 ∗ 100 The absolute humidity is defined as the weight of water present in unit volume of moist air measured in grams per cubic meter. Wet and Dry Bulb Hygrometer: The wet and dry bulb hygrometer is commonly used to measure the relative humidity in the testing laboratory and textile mill. It has a very simple design. The relative humidity can be checked easily by using this hygrometer. Construction: ➢ There are two thermometers. ➢ Dry bulb thermometer: It is uncovered, determines the room temperature. ➢ Wet bulb thermometer: It is surrounded by a wet sleeve of muslin which dips into a reservoir of distilled water, determines the lowest /cooling temp. Instrument • Wet and Dry Bulb Hygrometer.
- 3. Diagram of Wet and Dry Bulb Hygrometer: Working procedure: Measuring of relative humidity, wet and dry bulb hygrometer is one of the most important instrument which gives us R.H without any power consumption. Starting this experiment, At first we take a wet and dry bulb hygrometer. After taking this, we pour some water into the wet bulb water container. After putting water we wait 30 minute. Then we take the Dry bulb temperature and wet bulb temperature and also differentiate the wet and dry bulb temperature. Every one minute , every student take one wet and dry bulb temperature from wet and dry bulb hygrometer. Depends on dry bulb temperature and wet and dry bulb temperature we also take the RH% from the Table. At least, we calculate the mean and standard deviation. Data Table Std Id Time Dry Bulb Tempr (ºC) Dry Bulb &Wet Bulb Tempr diffn (ºC) R.H% 175001 2:30 30 3 80% 175002 2:31 30 3 80% 175003 2:32 30 3 80%
- 4. 175004 2:33 30 3 80% 175005 2:34 30 3 80% 175006 2:35 30 3 80% 175007 2:36 30 3 80% 175008 2:37 30 3 80% 175009 2:38 30 3 80% 175010 2:39 30 3 77% 175011 2:40 30 3 77% 175012 2:41 30 3 80% 175013 2:42 30 3 80% 175014 2:43 30 2.5 83% 175015 2:44 30 2.5 83% 175016 2:45 30 2.5 83% 175017 2:46 30 2.5 83% 175018 2:47 30 2 85% 175019 2:48 30 3 80% 175020 2:49 30 2.5 83% 175021 2:50 30 3 80% 175022 2:51 30 2.5 83% 175023 2:52 30 2.5 83% 175024 2:53 30 2 86% 175025 2:54 30 2 86% 175026 2:55 30 3 80% 175027 2:56 30 3 80% 175028 2:57 30 3 80% 175029 2:58 30 3 80% 175030 2:59 30 3 80% 175031 3:00 30 3 80% 175032 3:01 30 3 80% 175033 3:02 30 3 80% 175034 3:03 30 2 86% 175035 3:04 30 2 86% 175036 3:05 30 3 80% 175037 3:06 30 3 80% 175038 3:07 30 3 80% 175039 3:08 30 3 80% 175040 3:09 30 3 80% 175042 3:10 30 3 80% 175043 3:11 30 2 86% 175044 3:12 30 3.5 80% 175045 3:13 30 3 80% 175046 3:14 30 3 80% 175047 3:15 30 3 80%
- 5. 175048 3:16 30 3 80% 175050 3:17 30 3 80% 175051 3:18 30 3 80% 175052 3:19 30 3 80% 175053 3:20 30 3 80% 175054 3:21 30 3 80% 175055 3:22 30 3 80% 175056 3:23 30 3 80% 175057 3:24 30 3 80% 175058 3:25 30 3 80% 175059 3:26 30 3 80% 175060 3:27 30 3 80% 175061 3:28 30 3 80% Result Mean=((𝟒𝟒 ∗ 𝟖𝟎) + 𝟕𝟕 ∗ 𝟐) + (𝟖𝟑 ∗ 𝟒) + 𝟖𝟓 + (𝟖𝟑 ∗ 𝟑) + (𝟓 ∗ 𝟖𝟔))/𝟓𝟗 =80.84% Standard Deviation: =√ 𝟐𝟒𝟑.𝟔𝟏 𝟓𝟗−𝟏 =2.05 Variance=S.D2 =92.05)2 =4.2025 Conclusion After doing this experiment, we learn how to measurement the Relative humidity from the instrument of wet and dry bulb hygrometer. After doing this experiment we also learnt about humidity , Relative humidity and how to measure and uses of wet and dry bulb hygrometer.