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HEAT EXCHANGER NETWORK

HEAT EXCHANGER NETWORK. DIAGRAM GRID. CP (kW/C). 170 C. 60 C. 3,0. 2. 150 C. 30 C. 1,5. 135 C. 20 C. 2,0. 1. 4. 140 C. 80 C. 4,0. 3. PENJODOHAN ARUS. GUIDELINE. Di atas pinch : CP hot  CP cold Di bawah pinch : CP hot  CP cold. PENJODOHAN DI ATAS PINCH.

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HEAT EXCHANGER NETWORK

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  1. HEAT EXCHANGER NETWORK

  2. DIAGRAM GRID CP (kW/C) 170C 60C 3,0 2 150C 30C 1,5 135C 20C 2,0 1 4 140C 80C 4,0 3

  3. PENJODOHAN ARUS GUIDELINE • Di atas pinch : CPhotCPcold • Di bawah pinch : CPhotCPcold

  4. PENJODOHAN DI ATAS PINCH pinch CP (kW/C) 170C 90C 60C 2 3,0 150C 30C 90C 1,5 135C 20C 80C 1 2,0 4 140C 4,0 3 80C

  5. Penjodohanaliran yang melanggaraturan

  6. Jikaarus [2] dijodohkandenganarus [1]: Q1 = CP1 (135 – 80) = (2) (11) = 110 kW Q2 = CP2 (170 – 90) = (3) (80) = 240 kW Yang menjadipembatasadalaharus [1] dengankebutuhanpanas 110 kW. Jikasemuakebutuhanpanasarus [1] dipasokoleharus [2], makaperubahantemperaturarus [2] adalah: T = 110/CP2 = 110/3 = 36,7C Tin= 90 + 36,7 = 126,7C

  7. 126,7C 90C 135C 80C T = 10C T = 8,3C < Tmin

  8. Penjodohanaliran yang layak

  9. maksimalkanbebanpanasdalamsatuarus jumlah HE minimum

  10. pinch CP (kW/C) Q (kW) 170C 90C 3,0 240,0 2 150C 90C 1,5 90,0 4 135C 80C 1 2,0 110,0 140C 4,0 240,0 3 80C

  11. Arus [2] dijodohkandenganarus [3]: Q2 = 240 kW Q3 = 240 kW Arus [4] dijodohkandenganarus [1]: Q4 = 90 kW Q1 = 110 kW Sebagaipembatasadalaharus [4] Perubahantemperaturarus [1] dalam HE = 90/2 = 45C Temperaturarus [1] yang keluardari HE = 80 + 45 = 125C Arus [1] masihkekuranganpanassebesar 110 – 90 = 20 kW Panasiniharusdipasokolehutilitaspanas.

  12. pinch 170C 90C 2 150C 90C 80C 135C 125C H 1 4 20 kW 90 kW 80C 140C 3 240 kW

  13. PENJODOHAN DI BAWAH PINCH Arus-arusdinginharusdibawakeTpinchdengancaramempertukarkanpanasdenganarus-aruspanas. pinch CP (kW/C) Q (kW) 90C 60C 3,0 90,0 2 90C 30C 1,5 90,0 4 20C 80C 2,0 120,0 1

  14. Syarat: CPhot CPcold CP2 CP1  penjodohanlayak (3,0) (2,0) CP4 CP1  penjodohantidaklayak (1,5) (2,0)

  15. Arus [2] dijodohkandenganarus [1]: Q2 = 90 kW Q1 = 120 kW Sebagaipembatasadalaharus [2] Perubahantemperaturarus [1] dalam HE = 90/2 = 45C Temperaturarus [1] yang masukkeHE = 80 – 45 = 35C Arus [1] masihkekuranganpanassebesar 120 – 90 = 30 kW untukmemanaskanarus [1] dari 20C menjadi 35C

  16. Pemanasaninidipenuhidengancaramenjodohkanarus [1] denganaruspanas yang masihada, yaituarus [4]. Meskipunpenjodohanantaraarus [1] dan [4] tidakmemenuhikriteria CP, tetapipenjodohaninilayakkarenajauhdari pinch. Denganbebanpanassebesar 30 kW, makaarus 4 masihmemilikisisapanassebesar 60 kW yang harusdibuangkeutilitasdingineksternal.

  17. PEMECAHAN ARUS KRITERIA CP • Di atas pinch : CPhotCPcold • Di bawah pinch : CPhotCPcold KRITERIA JUMLAH ARUS • Di atas pinch : NhotNcold • Di bawah pinch : NhotNcold

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