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AR6611

 BUILDING SERVICES - III

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Unit 1

AIR CONDITIONING: BASIC REFRIGERATION PRINCIPLES

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Thermodynamics – Heat – Temperature – Latent heat of

fusion – evaporation, saturation temperature, pressure

temperature relationship for liquid refrigerants.

condensate cycle, air cycle, chilled water cycle and

cooling water cycle – vapor compression cycle –

compressors – evaporators – Refrigerant control

devices – electric motors – Air handling Units –

cooling towers.

CONTENT

art ! lecture "

art # lecture "

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vapor compression cycle

art #

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vapor compression cycle

art #

• Thecompr ssor$

a machine that increases

the pressure of a gas or vapor %typically

air&, or mi'ture of gases and vapors

compresses the ammonia gas. (t is located

on the outside of the refrigerator or

system. The compressed gas heats up as it

is pressuri)ed.

• Thecoils

 on the *ac+ of the refrigerator

let the hot ammonia gas dissipate its heat.

The ammonia gas condenses into ammonia

liquid at high pressure.

• The highpressure ammonia liquid flows

through the'pansion valv

. The e'pansion

valve regulates the flow and meters the

systems. -n one side of the valve is high

pressure ammonia liquid. -n the other side

of the hole is a lowpressure area %*ecause

the compressor is suc+ing gas out of that

side&.

• The liquid ammonia immediately *oils and

vapori)es. This ma+es the inside of the

refrigerator cold.

• The cold ammonia gas is suc+ed up *y

the compr ssor, and the cycle repeats.

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vapor compression cycle

art #

• The air conditioner system wor+s ust li+e

refrigeration system.

• Here is a window air conditioner.

• /ou can see that the evaporator is located

on the inside and wor+s ust the same with

the compressor on the inside, turning hot

air into cool.

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0asic Refrigeration 1ycle

art #

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1ompressors

art #

2Heart of the system, *elt

driven pump that fastened to

engine.

2Responsi*le for compressing

and transferring refrigerant.

Advantag s"

23ery high volumetric

efficiency %almost 456&

2Lesser 7oise and lighter

compared to rotary compressor.

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1ondenser

art #

2Responsi*le for heat

dissipation. The condenser is

designed to radiate heat.

2Located in front of the

radiator. Require good air

flow when system is in

operation

2late fin type heate'changer with micro channels

used. 3ery compact and *etter

heat transfer capa*ility.

2Hot compressed refrigerant

vapour cools at constantpressure to liquid.

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8vaporators

art #

2Heat a*sorption component.

2Used remove heat from the

inside of vehicle.

29econdary *enefit

dehumidification.

2Unconditioned air passes

through a filter *efore

entering the evaporator.

2latefin evaporator with

micro channels used.

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Air handling Units

art #

Typical AHU components"

!.9upply duct

#. :an compartment

;. :le'i*le connection

. :ilter compartment

?. Return and fresh air duct

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Air handling Units

art #

•part of an H3A1 system

•@evice used to condition andcirculate air

•Large metal *o' containing a*lower, heating or coolingelements, filter, and soundattenuators.

•1onnects to ductwor+ that

distri*utes the conditionedair through the *uilding andreturns it to the AHU

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Air handling Units

art #

• ay need to supply heating,

cooling, or *oth

• A furnace generates heat• :uel oil or natural gas• 8lectric heating

elements

• A refrigeration system

a*sor*s heat

• Air conditioner• Heat pump

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Air handling Units

art #

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Air handling Units

art #

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1ooling tower

art #

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1ooling tower

art #

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1ooling tower

art #

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1ooling tower

art #

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1ooling tower

art #

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Unit 2

AIR CONDITIONING: SYSTEMS AND APPLICATIONS

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a). Air conditioning system for small buildings – window types,

evaporative cooler, packaged terminal units and through the

wall units split system

b). Case for Central Plant – ! system – Chilled "ater

#ystem – Air Cooled and "ater Cooled condensers – Air

istribution system – $A$ % $&$ #ystems – 'ow temperature

applications ( Configuring si*ing of mechanical e+uipment,

e+uipment spaces and si*es for chiller plant, cooling tower,

an room, Circulation Pumps, Pipes, ducts – case studies.

CONTENT

Part - lecture

Part / lecture

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 Air conditioning system for small buildings

Part - lecture

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 Air conditioning system for small buildings

Part - lecture