Air Conditioning

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Air-Conditioning & Air-Conditioning & Ventilation Ventilation Pran Saurabh Pran Saurabh Agarwal Agarwal POWER LIMITED

description

detailed working methodology used in air conditioning

Transcript of Air Conditioning

  • Air-Conditioning & VentilationPran Saurabh AgarwalPOWER LIMITED

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  • POWER LIMITED Air-conditioningVentilation What is Air-conditioning and how it can be achieved? Why it is required? Type of Air-conditioning equipment? AC system used in our plant

    Topic for discussion What is Ventilation and how it works? Why it is required? Ventilation equipment used in our plant

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  • POWER LIMITED Air-conditioningWhat is Air-conditioning

    Air of one closed space is to be maintain at a certain temperature through equipments which were working on principle of Vapor Compression or Vapor Absorption Cycle.Air Conditioning: process of treating air to control simultaneously its temperature, humidity, cleanliness, and distribution to meet the requirements of the conditioned space

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  • POWER LIMITED CompressorVapor Compression CycleCondenserEvaporatorExpansion Device

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  • More DefinitionsCompressor-removes heat-laden vapor refrigerant from the evaporatorCondenser-removes the condensation heat from the refrigerant vaporEvaporator-picks up the heat removed by the condenserPOWER LIMITED

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  • POWER LIMITED Thermal Laws of RefrigerationFluids absorb heat while changing from liquid to vapor and give up heat during the changeTemperature is constant, if pressure remains constant Heat flows from hot to coldMetallic parts use metals that have a high heat conductivity Heat and other forms of energy are interchangeable (electricity to heat, heat to electrical energy, and heat to mechanical energy)

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  • POWER LIMITED RefrigerantsClassified into four areas: 1)Chlorofluorocarbons (CFCs) 2)Hydrochlorofluorocarbons (HCFCs) 3)Hydrofluorocarbons (HFCs)Chemical Name of refrigerant is R12(CCl2F2), R22(CHClF2), R134a(C2H2F4) etcAmmonia-penetrating odor, soluble in water, harmless in small concentrations, non-flammable, explosiveR-22-little odor, colorless as gas or liquid, non-toxic, non-irritating, non-flammable, non-corrosive, stable

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  • POWER LIMITED Air-conditioningFreon gas compressed by compressor (its at a cool temp.)Hot gas flows through tubing and condenses into a liquidFlows through expansion valve-evaporates and goes into gas form againGas goes through a set of pipes to dissipate the heat it has gainedProcess starts again

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  • POWER LIMITED Air-conditioningWhy it is requiredAir-conditioning is required for maintain the temperature of one closed space for Man & Machine Type of Air-conditioning equipment?1)DX type AC equipmentWith Air Cooled condenser

    i)Split ACii)Window ACiii)Split Ductable ACWith Water Cooled condenser

    2) Chilled Water System

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  • POWER LIMITED Air-conditioningWindow/ Split UnitsOperate the same as previous cycle, except for fansThe fans blow air on the coils (increases efficiency, keeps refrigerant cooler)The hot air is outside and the cool air is inside (hot side and cool side)

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  • POWER LIMITED Air-conditioning

    Measured in BTUsEER (Energy Efficiency Rating)EER=BTU rating/wattageSEER (Seasonal Energy Efficiency Rating)-better rating-uses average values instead of values at any given point in the cycleCOP (Coefficient of Performance)=SEER*0.293Window Unit Efficiency

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  • POWER LIMITED Air-conditioningSplit-Ductable System UnitsPartially inside and partially outside (separate hot side from cold side)Hot side=condensing unit=outsideCold side=coils and expansion valve-air ducts to carry air

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  • POWER LIMITED Air-conditioningContinuous-Cycle Absorption SystemsUsed in large buildingsConsists of : boiler, condenser, evaporator, & absorberOperates by gas, electricity, or keroseneAmmonia, Water, and Hydrogen presentNo moving parts-advantage

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  • POWER LIMITED Vapor Absorption Cycle

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  • AC system used in our plantPOWER LIMITED Air-conditioningIn our plant we are using various combination of units

    Centralized Air-conditioning through Chilled water and air handling unit combination, where chilled water is generated in a central location and circulated to differentplace as desired

    DX Unit with AHU combination with water cooled condenserDX Unit with AHU combination with air cooled condenserSplit AC, window etc

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