Hvac fundamentals

 Heating ventilation & Air conditioning

What is 🔥heating.।। 

Increasing the tempreture of the body by adding heat 🔥⚡energy is known as heating

When do we need heating? 

Heating is required when room temperature🌡️ are very low.।। 

What is ventilation? 

Removal of foul air & adding fresh 🍃💦air is known as ventilation

There are two ✌types of ventilation

Natural ventilation

Forced ventilation

Natural ventilation which takes place through 🚪door gaps & window gaps

Forced ventilation is provided by exhaust fans jet fans or by blowers.।।। 

Air conditioning

Air condition❄💨 is nothing but changing properties of air like

Tempreature

Humidity

Purity

Noise

Air flow

Tempreature is defined as Degree of hotness or coldness of a body 

Comfort body temperature🌡️

22° to 26°c

Exact human comfort temperature🌡️ 75°f

Instrument used for measuring temperature🌡️ is 🔥Thermometer

Humidity is defined as amount of water 💦vapor present in the air is known as Humidity

Human comfort humidity levels is 30% to 70%

Instrument used to measure humidity is Hygrometer or sling Pschrometer

Purity is defined as purity of air is control by using filters is known as purity

Types of filters

Prefilters used for rooms upto 75%

Fine filters used for luxuary upto 95%

Hepa filters & Ulpa filters used for operation

Threatre & for medicine factories 

HEPA high effeciency particulate arrestor 99.7%

ULPA Ultra low particulate arrestor 99.9%

Noise is defined as To reduce the noise accousting lining is used

Unit decibels DB

Instrument used is known as DB metre

Last but not the least

Air flow is defined as air velocity & it's directions 

Air Quantity is measured in CFM

Cubic feet per meter

It is measure by Anemometer