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Capitolo 5
Il bilancio entropico
65
1
2
3
4
5
Q
12
Q
23
Q
34
Q
45
Q
51
L
45
L
51
L
12
L
23
L
34
m
m
m
m
m
Figura 5.3
1
2
3
4
5
m·
m
·
m
·
m
·
m
·
q
12
q
51
q
23
q
34
q
45
P
12
P
23
P
34
P
45
P
51
Figura 5.4
RYYHUR LQ XQD WUDVIRUPD]LRQH FLFOLFD JOL VFDPEL WHUPLFL H JOL VFDPEL GL FDORUH FRPSOHVVLYD
-
PHQWH VL HTXLYDOJRQR 3HUWDQWR WUDVIRUPD]LRQL GL TXHVWR WLSR QRQ VROR FRQVHQWRQR OD FRQYHU
-
VLRQH GL FDORUH LQ ODYRUR H YLFHYHUVD PD JRGRQR DQFKH GHO YDQWDJJLR GL SRWHU HVVHUH ULSHWXWH
LQGH¿QLWDPHQWH LQ WDO PRGR GHWWR
¨lj
LO WHPSR ULFKLHVWR SHU FRPSLHUH XQ FLFOR FRPSOHWR VL
DYUDQQR GHJOL VFDPEL GL SRWHQ]D WHUPLFD H GL SRWHQ]D PHFFDQLFD L FXL YDORUL PHGLDWL QHO WHP
-
SR VDUDQQR ULVSHWWLYDPHQWH
¯
q
=
Q
if
»
¨lj
e
¯
P
=
L
if
»
¨lj
'LYLGHQGR TXLQGL DPER L PHPEUL SHU
¨lj
OD
SXz DQFKH HVVHUH ULVFULWWD FRPH
¯
q
¯
P
(5.3)
,Q PRGR DQDORJR FRQVLGHUDQGR XQD WUDVIRUPD]LRQH FLFOLFD UHDOL]]DWD PHGLDQWH XQD VXF
-
cessione di sistemi aperti in regime permanente, in base al bilancio energetico per ciascuno
GL HVVL VL DYUj
q
=
m
˙
[(
h
+
u
T
9
)
u
– (
h
+
u
T
9
)
e
] +
P
(5.4)