HVAC QUESTIONS AND ANSWERS
Units BTU (British thermal units)1BTU:-it is the amount of energy required to raise 1degree Fahrenheit temperature of 1pound of water increases the temperature of 1degree Fahrenheit1 Lb=0.45kgs(or)1kg=2.2Lbs Types of Heat sensible heat it can be sensed or measured by an ordinary dery bulb thermometer.Eg human body temperature can be measured usens thermometer latent.
Heat:- it can be sensed or measured by ordinary dry bulb thermometer.it is a hidden heat.Latent heat is absorbed or released when ever there is a change in phase.when the water becomes vapor and vice versa.
2. What IS ASHRAE
American societs of Heating Refrigeration and Air Conditioning Engineers.
3. What Is ton
Ton of refrigeration:- it is the amount of energy required to freeze 1pound of water is 24 hors
4. Volume of air is measured in
Volume of air is measured in terms of CFM=CUBIC FEET Per minute CMH=Cubic metre per hour m3/sec=Cubic metre per second L/sec= Liters per second cmlt=1.7×cfm CFM=2118×M3/sec CFM=2.119×1/sec
5. What Is the room temperature that you maintain in any room 1m
24 Degree Celsius or 76 degree Fahrenheit
6. CFM= velocity usually 1500 Area in sqftd/2 ^2 3 1416/144
7. 1ton= 12000 Btu/kw=3.516kw
8. What Is CFM
Cubic feet minute, it is the unit of air flow
9. What Is pumps supply fittings
Thermometer,Shut off valve pressure gauge,Strainer,test point,drain cock union flexible Connector and eccentric reducer.
8. CFM Distribution write the given flowr plan
Use ductular
9. What is pumps return fittings
Eccentic reducer,flexible Connector,Union test point, Check value,Strainer,gate valve,Check Valve,temp sensors.
10. What Is Aspect Ratio
It is the ratio between ht n length of the duct generally we take 1:2 can vary with space and size up till 1:4
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