Training on HVAC Training on HVAC

Dhanush Computer Services Pvt Ltd., 2nd Floor,Lenin Building, Bhagyanagar colony, Opp.KPHB Colony , Kukatpally,

Hyderabad-500072.Andhra Pradesh, INDIAM: 0 9908080813 , PH: 040 40064413

About DCSAbout DCS

DHANUSH [DCS (P) Ltd] provides Training in HVAC, ELECTRICAL, PLUMBING &

PIPING INDUSTRIES

Since its inception DCS has trained more than 2500 B.Tech, ITI, & Polytechnic

students and provided placements

Content for the courses is drawn from well experienced faculty and that makes

Dhanush different from its competitors

Courses designed are very comprehensive and aligned with the industry job

Dhanush also provides manpower in HVAC, ELECTRICAL, PLUMBING & PIPING

INDUSTRIES

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What is HVAC ?What is HVAC ? HVAC – Heating, Ventilation and Air-Conditioning.

Heating – The temperature out side is less than inside.

Ventilation – Sending the air out from the space and/or supplying the fresh air into the space.

Air-Conditioning – It mean a process by which the temperature, humidity, flow and purity of the air is controlled simultaneously – to get the required conditions.

Why do we require air Why do we require air conditioning?conditioning?

To improve or control an Industrial process.To maintain Human comfort.

Man a heat MachineMan a heat Machine

Food eaten is the fuel.Every body movement generates heat even

the blink of an eye.To maintain 98.6 Degrees Fahrenheit it

rejects heat.In what way it rejects heat?

Heat TransferHeat Transfer

Conduction Convection Radiation

Conduction: The heat transfer due to conduction takes place if the two bodies at different temperatures are in contact with each other. It is also true if a substance is heated from one end. heat transfer takes place to the other end by conduction.

Convection: When liquid or gas is heated, expansion takes place. Due to this it becomes lighter and rises up. Its place is taken by colder or dense fluid. This is a continuous process and thus heat transfer takes place due to these currents and heat is distributed through the mass.

 Radiation: The heat transfer due to radiation takes place from one body to another without effecting the medium through which heat travels. Heat flow from sun to earth takes place in this fashion.

All three methods normally are used at the same time.

All three methods gives off excess heat.One method may do more and the other

may do less.Depending on the surrounding conditions.

What are the surrounding What are the surrounding conditions ?conditions ?

Temperature Relative Humidity Air Motion

Change in each of this surrounding condition will speed up or slow down the heat rejection or gain.

Comfort Zone for Human Comfort Zone for Human beings.beings.

What is the best temperature in which all will feel comfort ?

What is the best relative humidity which gives you comfort ?

Temperature Range 22-26.5 C Relative Humidity 30-70% .

Outside and InsideOutside and Inside

A man in out door – needs to adjust him self with his clothing and whims of nature.

A man inside shelter – We can control his comfort.

HOW ?

By means of HVAC By means of HVAC

Openings in the field of HVAC Marketing Design Drafting Installations Maintenance

FundamentalsFundamentals

Heat Q is the mechanism that transfers energy across the boundaries of systems with differing temperatures, always toward the lower temperature.

Sensible heat factorSensible heat factor: The total heat of air is the : The total heat of air is the sum of sensible heat and latent heat. The sum of sensible heat and latent heat. The sensible heat factor is the ratio of sensible heatsensible heat factor is the ratio of sensible heat

to the total heat.to the total heat.

SHF = SH/TH SHF = SH/TH

Sensible Heat: It is defined as the amount of heat required to raise the temperature of 1kg of substance from 0 C to the desired temperature without changing its state.

Latent Heat: Latent heat of a substance varies from its sensible heat as it does not cause any temperature variation within the body but changes its state i.e.., from solid to liquid or liquid to gas.

Example: 80 Kcal of heat is absorbed from the surroundings when 1kg of ice changes into water at a constant temperature 0 C to freeze it to ice at the same temperature.

Units of RefrigerationUnits of Refrigeration

The unit of refrigeration is termed as ‘Tons of refrigeration’ or simply ‘Tons’ and it is equal to the amount of heat extracted to enable 1 ton of ice to melt in 24 hours.

In MKS system 1Ton = 3,000 k cal/hour or 50k cal/min.

In British Units 1 Ton = 12,000 BTU/hr.

Contact us on www.meptrainings.com to more about our HVAC training.