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PSYCHRO11 PSYCHROMETRY CHART 1 & HEAT LOAD RAMLI MOHD. YUSOFF JURUTERA MEKANIKAL CKM, IPJKR MALAYSIA RAMLI MOHD. YUSOFF JURUTERA MEKANIKAL CKM, IPJKR MALAYSIA.

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Presentation on theme: "PSYCHRO11 PSYCHROMETRY CHART 1 & HEAT LOAD RAMLI MOHD. YUSOFF JURUTERA MEKANIKAL CKM, IPJKR MALAYSIA RAMLI MOHD. YUSOFF JURUTERA MEKANIKAL CKM, IPJKR MALAYSIA."— Presentation transcript:

1 PSYCHRO11 PSYCHROMETRY CHART 1 & HEAT LOAD RAMLI MOHD. YUSOFF JURUTERA MEKANIKAL CKM, IPJKR MALAYSIA RAMLI MOHD. YUSOFF JURUTERA MEKANIKAL CKM, IPJKR MALAYSIA

2 PSYCHRO12 DEFINITION - PSYCHROMETRICS is the science that deals with physical laws governing the behaviour of AIR-WATER mixtures. The measurement of the heat and water vapour properties of air.

3 PSYCHRO13 FACTORS INFLUENCING COMFORT 1. TEMPERATURE 2. HUMIDITY 3. AIR MOTION 4. PURITY OF AIR

4 PSYCHRO14 AIR AND PROPERTIES DRY AIR CONSISTS OF ; NITROGEN (77%) + OXYGEN (23%) + OTHER GASES + WATER VAPOUR (small in quantities but significant to air-cond)

5 PSYCHRO15 PROPERTIES OF DRY AIR AND ITS RELATION TO PSYCHROMETRIC CHART DRY BULB (db) TEMPERATUREDRY BULB (db) TEMPERATURE WET BULB (wb)TEMPERATUREWET BULB (wb)TEMPERATURE DEWPOINT (dp)TEMPERATUREDEWPOINT (dp)TEMPERATURE RELATIVE HUMIDITY (rh)RELATIVE HUMIDITY (rh) SPECIFIC HUMIDITY (HUMIDITY RATIO)SPECIFIC HUMIDITY (HUMIDITY RATIO)

6 PSYCHRO16 DRY BULB TEMPERATURE (db) is the temperature that is measured using the standard thermometer(db) is the temperature that is measured using the standard thermometer db is represented as vertical lines on the chartdb is represented as vertical lines on the chart

7 PSYCHRO17 DB Dry Bulb

8 PSYCHRO18 WET BULB TEMPERATURE Temperature associated with the moisture content of the air.Temperature associated with the moisture content of the air. Taken by surrounding the thermometer with a wet wick and measuring the reading as the water evaporatesTaken by surrounding the thermometer with a wet wick and measuring the reading as the water evaporates WB line slant from the lower right towards the upper left hand corner.WB line slant from the lower right towards the upper left hand corner.

9 PSYCHRO19 DB WB Dry Bulb Wet Bulb

10 PSYCHRO110 QUESTION? TANDAKAN SUHU UDARA BERIKUT DIATAS GAMBARAJAH PSYCHROMETRY ANDA 92DB, 80WB 95DB, 83WB 75DB, 64WB 72DB, 60WB

11 PSYCHRO111 DEW POINT (DP) DP corresponds to the dry bulb (or wet bulb) temperature at which air becomes completely saturated.DP corresponds to the dry bulb (or wet bulb) temperature at which air becomes completely saturated. When moist air is cooled, it cannot hold the same amount of moisture. At some point, the moisture will condense out of the air onto any nearby surface.When moist air is cooled, it cannot hold the same amount of moisture. At some point, the moisture will condense out of the air onto any nearby surface. DP is read along the saturation line (100% rh)DP is read along the saturation line (100% rh)

12 PSYCHRO112 DB WB, DP Wet Bulb, Dew Point Dry Bulb

13 PSYCHRO113 QUESTION 2? APAKAH TITIK SUHU EMBUN (DEW POINT) BAGI SUHU BERIKUT? 92DB, 80WB 95DB, 83WB 75DB, 64WB 72DB, 60WB

14 PSYCHRO114 RELATIVE HUMIDITY Ratio of the actual water vapour pressure of the air to the saturated water vapour pressure of the air at the same temperature.Ratio of the actual water vapour pressure of the air to the saturated water vapour pressure of the air at the same temperature. If the air is holding all the moisture it can for a specific set of conditions, then it is said to be 100% rh.If the air is holding all the moisture it can for a specific set of conditions, then it is said to be 100% rh. The amount of moisture the air can it hold increases as the dry bulb temp. increases.The amount of moisture the air can it hold increases as the dry bulb temp. increases. RH line curve from the lower left hand portion up and to the rightRH line curve from the lower left hand portion up and to the right

15 PSYCHRO115 Dry Bulb Wet Bulb, Dew Point DB WB, DP RH

16 PSYCHRO116 QUESTION 3? APAKAH RELATIVE HUMIDITY (RH) BAGI UDARA SUHU-SUHU BERIKUT? 92DB, 80WB 95DB, 83WB 75DB, 64WB 72DB, 60WB

17 PSYCHRO117 SPECIFIC HUMIDITY Is the amount of water vapour, by weight, in the air.Is the amount of water vapour, by weight, in the air. Represented as horizontal lines on the chart and is normally given in “grains” of moisture per pound of dry air.Represented as horizontal lines on the chart and is normally given in “grains” of moisture per pound of dry air.

18 PSYCHRO118 Dry Bulb Wet Bulb, Dew Point DB WB, DP RH Sp. Humidity

19 PSYCHRO119 QUESTION 4? APAKAH KANDUNGAN MOISTURE (MOISTURE CONTENT GRAIN/POUND) BAGI UDARA DI SUHU-SUHU BERIKUT? 92DB, 80WB 95DB, 83WB 75DB, 64WB 72DB, 60WB

20 PSYCHRO120

21 PSYCHRO121

22 PSYCHRO122 NEXT TOPIC IS INTRODUCTION TO HEAT LOAD CALCULATION 1

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