φ = φ n Kompressor neem 0.5 m 3 /s CO2 in teen 100 kpa en 26.85ºC. Die kompressor is adiabaties en ontvang 10 kw drywing.

Transcription

1 v v Voorlttrs n Van Intals and Surnam Studnt nommr Studnt numbr Datum / Dat MX 0 KLASOES 5A / CLASSES 5A 5 mn. (5 unt/marks) *Sal hrwrk tot 0 unt vr klaslys dolnds * Wll b workd back to 0 marks for class lst uross Handtknng / Sgnatur n Komrssor nm 0.5 m 3 /s CO n tn 00 kpa n 6.85ºC. D komrssor s adabats n ontvang 0 kw drywng. Aanvaar dat d gas daal s n gbruk abl A8 (onvolldg). A comrssor taks n 0.5 m 3 /s CO at 00 kpa and 6.85ºC. h comrssor s adabatc and rcvs 0 kw of owr. Assum th gas to b dal and us abl A8 (ncomlt). a) Wat s d massa-vlo-tmo by d utlaat? b) Wat s d utlaat tmratuur [K]? a) What s th mass flow rat at th outlt? b) What s th outlt tmratur [K]? D ssfk arbd word nou vrhoog mt n faktor 0 wns n blokas by d nlaat h scfc work s now ncrasd by a factor of 0 du to a blockag at th nlt. c) Baal d nuw utlaat tmratuur (u mag n gbruk maak van n ssfk htt waard n). c) dtrmn th nw outlt tmratur (you may not mak us of a scfc hat valu) Utrksl ut Formul Blad / Extract from Formula Sht: φ = φ f + xφ fg Pv = ZR H = U + PV δ W = PdV PV n = const. u E = U + + mgz dm δ = δ W h & & = = m m 0 dt + U = U + W & V de V + m & ( h + + gz ) = + m & ( h + + gz + W & dt ) HANDIG DIE VRAESEL OOK IN ASB PLEASE HAND HE UESION PAPER IN AS WELL

2 v v Voorlttrs n Van Intals and Surnam Studnt nommr Studnt numbr Datum / Dat MX 0 KLASOES 5B / CLASSES 5B 5 mn. (5 unt/marks) *Sal hrwrk tot 0 unt vr klaslys dolnds * Wll b workd back to 0 marks for class lst uross Handtknng / Sgnatur n Komrssor nm 0.6 m 3 /s O n tn 90 kpa n 6.85ºC. D komrssor s adabats n ontvang 5 kw drywng. Aanvaar dat d gas daal s n gbruk abl A8 (onvolldg). A comrssor taks n 0.6 m 3 /s O at 90 kpa and 6.85ºC. h comrssor s adabatc and rcvs 5 kw of owr. Assum th gas to b dal and us abl A8 (ncomlt). a) Wat s d massa-vlo-tmo by d utlaat? b) Wat s d utlaat tmratuur [K]? a) What s th mass flow rat at th outlt? b) What s th outlt tmratur [K]? D ssfk arbd word nou vrhoog mt n faktor 5 wns n blokas by d nlaat h scfc work s now ncrasd by a factor of 5 du to a blockag at th nlt. c) Baal d nuw utlaat tmratuur (u mag n gbruk maak van n ssfk htt waard n) c) Dtrmn th nw outlt tmratur (you may not mak us of a scfc hat valu) Utrksl ut Formul Blad / Extract from Formula Sht: φ = φ f + xφ fg Pv = ZR H = U + PV δ W = PdV PV n = const. u E = U + + mgz dm δ = δ W h & & = = m m 0 dt + U = U + W & V de V + m & ( h + + gz ) = + m & ( h + + gz + W & dt ) HANDIG DIE VRAESEL OOK IN ASB PLEASE HAND HE UESION PAPER IN AS WELL

3 v v Voorlttrs n Van Intals and Surnam Studnt nommr Studnt numbr Datum / Dat MX 0 KLASOES 5C / CLASSES 5C 5 mn. (5 unt/marks) *Sal hrwrk tot 0 unt vr klaslys dolnds * Wll b workd back to 0 marks for class lst uross Handtknng / Sgnatur n Gasturbn ontvang.6 m 3 /s CO tn ºC n 900 kpa n stl dt vry tn 00 kpa. Dt s adabats n lwr kw drywng. Aanvaar dat d gas daal s n gbruk abl A8 (onvolldg). A gas turbn rcvs.6 m 3 /s CO at ºC and 900 kpa and rlass t at 00 kpa. It s adabatc and roducs kw of owr. Assum th gas to b dal and us abl A8 (ncomlt). a) Wat s d massa-vlo-tmo by d utlaat? b) Wat s d utlaat tmratuur [K]? a) What s th mass flow rat at th outlt? b) What s th outlt tmratur [K]? D turbn bgn htt t vrloor n d massavlotmo word vrhoog om stds d oorsronkk drywng t lwr. D ssfk arbd val agtr mt 0%. D utlaat tmratuur s nou 300ºC. c) Baal d ssfk httvrls (u mag n gbruk maak van n ssfk htt waard n) h turbn starts to loos hat and th mass flow rat s ncrasd to mantan th orgnal owr outut. Howvr, th scfc work dros by 0%. h outlt tmratur s now 300ºC. c) Dtrmn th scfc hat loss (you may not mak us of a scfc hat valu) Utrksl ut Formul Blad / Extract from Formula Sht: φ = φ f + xφ fg Pv = ZR H = U + PV δ W = PdV PV n = const. u E = U + + mgz dm δ = δ W h & & = = m m 0 dt + U = U + W & V de V + m & ( h + + gz ) = + m & ( h + + gz + W & dt ) HANDIG DIE VRAESEL OOK IN ASB PLEASE HAND HE UESION PAPER IN AS WELL

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