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Mechanical Engineering Department Faculty of Engineering Gadjah Mada University 2006/2007

HIBAH PENGEMBANGAN COURSE CONTENT BERBASIS WEB & MULTIMEDIA PROGRAM HIBAH KOMPETISI K 1 INHERENT UNIVERSITAS GADJAH MADA 2006. Mechanical Engineering Department Faculty of Engineering Gadjah Mada University 2006/2007. Topics :. 1. AC Principle 2. Human being thermodynamic

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Mechanical Engineering Department Faculty of Engineering Gadjah Mada University 2006/2007

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  1. HIBAH PENGEMBANGAN COURSE CONTENT BERBASIS WEB & MULTIMEDIAPROGRAM HIBAH KOMPETISI K 1 INHERENT UNIVERSITAS GADJAH MADA 2006 Mechanical Engineering Department Faculty of Engineering Gadjah Mada University 2006/2007

  2. Topics : • 1. AC Principle • 2. Human being thermodynamic • 3. Cooling Load • 4. Psychrometric • 5. Type of AC • 6. Air Handling Unit (AHU) • 7. Fan Cooling Unit (FCU) • 8. Trouble Shooting

  3. AC controls air : Temperature RH % Quality Air Circulation Noise Refrigeration Application Cold storage Room AC Textile Industry Ice Cream Factory Electronic Manufactory Mall, High Rise Building etc AC Principle

  4. Atmosphere Air Standard G = 9,807 m/s2 T = 15 C P = 1 atm = 14,7 psi = 101,325 kPa P v = R T  = 1,225 kg/m3 R = 287 J/kgK Air Composition : Dry Air : O2 = 20,95% N2 = 78,09% CO2= 0,03% Ar = 0,93% BM =28,965 Moisture (H2O) BM=18

  5. Tekanan, P = Pa + Pv Kelembaban spesifik Kelembaban relatif Tingkat kejenuhan Volume spesifik, v Temperatur bola kering, Tdb Temperatur bola basah, Twb Temperatur jenuh, Tdp Enthalpi, h Sifat-sifat udara

  6. Psychrometric Chart RH (%) Tdp

  7. SKALA SHF RH =50% Tdb=24 oC

  8. Thermodynamic process Proses : 0-1 = Sensible heating 0-2 = Sensible cooling 0-3 = Humidification 0-4 = Dehumidification 0-5 = Heating & Dehumidification 0-6 = Heating & Humidification 0-7 = Cooling & Humidification 0-8 = Cooling & Dehumidification 3 6 7 2 1 0 8 4 5

  9. Human Being Thermodynamic UDARA(0,5 m3/jam) Hm = 100% Ha = 2% SENSIBEL Hc = 25% HR = 43% He = 30% HL = 80% LATEN W = 20% Hm – W = He + Hc + HR Heat reject man = 105 – 117 Watt/man

  10. Cassette Type Indoor Unit

  11. Ceiling Type Indoor Unit

  12. Packaged AC

  13. Meeting Room

  14. Wall Mounted Indoor Unit

  15. Internal : Penghuni Lampu Peralatan listrik Eksternal : Infiltrasi Radiasi surya Konduksi, konveksi Ventilasi Fan, ducting Energy Source Infiltrasi Lampu Peralatan listrik Konduksi Penghuni 1TR = 12 000 Btu/hr = 3,5 kW = 3000 kcal/hr

  16. Pengelompokan beban pendinginan TSH,TLH,GTH OASH,OALH OATH TR, RH% RSH,RLH,RTH ERSH, ERLH, ERTH AHU MA SA DA OA BF RA BA EA RA TSH = RSH + OASH TLH = RLH + OALH GTH = TSH +TLH ERSH = RSH + BF.OASH ERLH = RLH + BF. OALH ERTH + ERSH + ERLH

  17. CARA MENGGAMBAR GARIS SHF Misal RSHF = 0,75 R(24oC,60%)

  18. Proses pengkondisian udara O M GSHF RSHF R S Tadp ERSHF TR TSA

  19. Satuan British CFMsa Satuan SI CMMSA Kebutuhan udara suplai RSH,RLH, RTH (Btu/hr) T (F),  ( grain/lb) CFM (ft3/min) RSH,RLH, RTH (kW) T (F),  ( gram/kg) CMM (m3/min) = 35 CFM

  20. Tabel Bypass Factor

  21. Thank You • To be continue

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