TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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TEHNIČKA TERMODINAMIKA__________________________________________ 1 – 2 adijabatska kompresija −1 −1 s1 = s2 = s288 ′′ K = 0.5618 kJ kg K x ( s ′′ − ) s ′ ′ 1 = s1 + x1 ⋅ 1 s1 0.5618 − = 0.5777 − ( 0.0687) ( 0.0687) 1 = 975 −1 [ 145 − ( −18) ] = 145.9 kJ h 1 = −18 + 0.975 ⋅ kg −1 h4 = h3 = h288 ′ K = 14.2 kJ kg −1 q0 = 145.9 − 14.2 = 131.7 kJ kg −1 w = h1 − h2 = h1 − h288 ′′ K = 145.9 − 162 = −16.1kJ kg Slučaj b) je povoljniji. ε = w q 131.7 = 16.1 0 h = 8.18 Primjer 7.8. Na slici je predočen shematski način grijanja prostorija na načelu dizalice topline. U kondenzatoru radijatora rashladna tvar kondenzacijom predaje toplinu pri temperaturi kondenzacije od 323 K. U regulacijskom ventilu (RV) prigušuje se para rashladne tvari do tlaka pri kojem je temperatura zasićenja 273 K. Isparavanjem tvar prima toplinu od “toplije” rijeke koju preko uređaja prenosi u prostorije. a) Koliki je grijni koeficijent ako se proces odvija po Carnotovom procesu? b) Za koliko je takav sustav ekonomičniji od direktnog grijanja električnom energijom? 328
_______________________________________________________________Rashladni strojevi Slika P7.8. Rješenje a) ε q T 323 = 323 − 273 0 gC = = = w T0 − T 6.46 Slika P7.8.a 329
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Prof. dr. sc. Nedjeljka Petric Prof
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TehniÄka termodinamika - Kemijsko-tehnoloÅ¡ki fakultet

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