b) Wat is die buite-lug temperatuur by die
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1 Voorlttrs n Van MTX 0 KLASTOETS 6A / CLASSTES 6A 5 mn. (5 punt/marks) *Sal hrwrk tot 0 punt vr klaslys dolnds / Wll b workd back to 0 marks for class lst purposs Voorlttrs n Van MTX 0 KLASTOETS 6B / CLASSTES 6B 5 mn. (5 punt/marks) *Sal hrwrk tot 0 punt vr klaslys dolnds / Wll b workd back to 0 marks for class lst purposs as n httpomp wat htt ut d hus onttrk. In d wntr ontvang d kondnsator huslug tn m /s n vrht dt van T = 0ºC tot T = 0ºC trwyl d lug dur d kondnsator vlo. D vrdampr ontvang butlug tn T = 5ºC, tn kg/s. D komprssor word aangdryf dur n kw motor. a) Brkn d d β ' van d httpomp utlaat van d vrdampr? (T ) htt kan ut d hus onttrk word n d somr? In th wntr th condnsr rcvs hous-ar at m /s and hats t from T = 0ºC to T = 0ºC as th ar flows through th condnsr. Th vaporator rcvs xtrnal ar at T = 5ºC, at kg/s. Th comprssor s powrd by a kw motor. a) Dtrmn β ' of th hat pump. th xt of th vaporator? (T ) hat can b xtractd from th hous n th summr? as n httpomp wat htt ut d hus onttrk. In d wntr ontvang d kondnsator huslug tn 0.9 m /s n vrht dt van T = 0ºC tot T = 5ºC trwyl d lug dur d kondnsator vlo. D vrdampr ontvang butlug tn T = 7ºC, tn. kg/s. D komprssor word aangdryf dur n kw motor. a) Brkn d β ' van d httpomp utlaat van d vrdampr? (T ) htt kan ut d hus onttrk word n d somr? In th wntr th condnsr rcvs hous-ar at 0.9 m /s and hats t from T = 0ºC to T = 5ºC as th ar flows through th condnsr. Th vaporator rcvs xtrnal ar at T = 7ºC, at. kg/s. Th comprssor s powrd by a kw motor. a) Dtrmn β ' of th hat pump. th xt of th vaporator? (T ) hat can b xtractd from th hous n th summr? P = 00 kpa R = 87 J/kgK C p0 = 00 J/kgK T =0ºC P = 00 kpa R = 87 J/kgK C p0 = 00 J/kgK T =5ºC T = 5ºC T =0ºC T = 7ºC T =0ºC
2 Voorlttrs n Van MTX 0 KLASTOETS 6C / CLASSTES 6C 5 mn. (5 punt/marks) *Sal hrwrk tot 0 punt vr klaslys dolnds / Wll b workd back to 0 marks for class lst purposs Voorlttrs n Van MTX 0 KLASTOETS 6D / CLASSTES 6D 5 mn. (5 punt/marks) *Sal hrwrk tot 0 punt vr klaslys dolnds / Wll b workd back to 0 marks for class lst purposs as n httpomp wat htt ut d hus onttrk. In d somr ontvang d vrdampr hus-lug tn m /s n vrkol dt van T = 5ºC tot T = 8ºC trwyl d lug dur d vrdampr vlo. D kondnsator ontvang butlug tn T = 5ºC, tn kg/s. D komprssor word aangdryf dur n kw motor. a) Brkn d β van d stlsl. utlaat van d kondnsator? (T ) htt kan aan d hus glwr word n d wntr? In th summr th vaporator rcvs housar at m /s and cools t from T = 5ºC to T = 8ºC as th ar flows through th vaporator. Th condnsr rcvs xtrnal ar at T = 5ºC, at kg/s. Th comprssor s powrd by a kw motor. a) Dtrmn β of th systm. th xt of th condnsr? (T ) hat can b dlvrd to th hous n th wntr? as n httpomp wat htt ut d hus onttrk. In d somr ontvang d vrdampr hus-lug tn 0.5 m /s n vrkol dt van T = ºC tot T = 8ºC trwyl d lug dur d vrdampr vlo. D kondnsator ontvang butlug tn T = 5ºC, tn. kg/s. D komprssor word aangdryf dur n.8 kw motor. a) Brkn d β van d stlsl utlaat van d kondnsator? (T ) htt kan aan d hus glwr word n d wntr? In th summr th vaporator rcvs housar at 0.5 m /s and cools t from T = ºC to T = 8ºC as th ar flows through th vaporator. Th condnsr rcvs xtrnal ar at T = 5ºC, at. kg/s. Th comprssor s powrd by a.8 kw motor. a) Dtrmn β of th systm. th xt of th condnsr? (T ) hat can b dlvrd to th hous n th wntr? P = 00 kpa R = 87 J/kgK C p0 = 00 J/kgK T =8ºC P = 00 kpa R = 87 J/kgK C p0 = 00 J/kgK T =8ºC T =5ºC T =ºC T =5ºC T =5ºC
3 Utrksl ut Formul Blad / Extract from Formula Sht: φ = φ f + xφ fg Pv = ZRT H = U + PV δ W = PdV PV n = const. u h Cv = C p = T v T p W Q η = β = L / H Q H W TdS = du + PdV TdS = dh VdP mv E = U + + mgz dm = m& m& = 0 dt δ Q = δw mv mv Q + U + + mgz = U + + mgz + W V de V Q & + m& ( h + + gz ) = + m& ( h + + gz + W& dt )
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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.
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
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