86
4.4.2 Efisiensi termal yang dihasilkan bahan bakar E100 P = 200 watt = 0,200 kW
⇒
n= 4160 rpm ṁf = 0,864 kgjam
LHV = 23671,83 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,200
0864.23671,83.0,97 � 3600
η
b
= 0,036292 η
b
= 3,36292
P = 407,5 watt = 0,4075 kW
⇒
n= 4200 rpm ṁf = 0,947368 kgjam
LHV = 23671,83 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,4075
0,947368.23671,83.0,97 � 3600
η
b
= 0,067438 η
b
= 6,7438
P = 625 watt = 0,625 kW
⇒
n= 4250 rpm ṁf = 01,102041 kgjam
LHV = 23671,83 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,625
1,102041.23671,83.0,97 � 3600
η
b
= 0,088916 η
b
= 888916
P = 636,75watt = 0,63675 kW
⇒
n= 4128 rpm ṁf = 1,2413379 kgjam
LHV = 23671,83 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600
Universitas Sumatera Utara
87
η
b
= 0,63675
1,2413379 .23671,83.0,97 � 3600
η
b
= 0,08042 η
b
= 8,042
P = 657,72 watt = 0,65772 kW
⇒
n= 4051 rpm ṁf = 1,285714 kgjam
LHV = 23671,83kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 1,002
1,285714.2361,83.0,97 � 3600
η
b
= 0,080202 η
b
= 8,0202
P = 656 watt = 0,656 kW
⇒
n= 3862 rpm ṁf = 1,032 kgjam
LHV =23671,83 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 00,656
1,032 .41466.0,97 � 3600
η
b
= 0,07809 η
b
= 0,07809
Tabel 4.14 Efisiensi thermal hasil pengujian menggunakan bahan bakar E100 Bahan
Bakar Paramet
er Perform
ansi Jumlah beban 100 Watt
2 4
6 8
10 12
E 100
n rpm 4160
4200 4250
4128 4051
3862 P Watt
200 407,5
625 636,7
5 657,7
2 656
LHV kJkg
23671 ,83
23671 ,83
23671 ,83
23671 ,83
23671 ,83
23671 ,83
ṁf kgjam
0,864 0,947
368 1,102
041 1,241
379 1,285
714 1,317
073 η
b
0,036 0,067
0,088 0,080
0,080 0,078
Universitas Sumatera Utara
88 292
438 916
42 204
09
4.4.3 Efisiensi termal yang dihasilkan bahan bakar P50 + E50 P = 202,5 watt = 0,2025 kW
⇒
n= 4280 rpm ṁf = 0,824427 kgjam
LHV = 23824,89 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,2025
0,824427.23824,89.0,97 � 3600
η
b
= 0,038262 η
b
= 3,8262
P = 406,62 watt = 0,40662 kW
⇒
n= 4329 rpm ṁf = 0,907563 kgjam
LHV = 23824,89 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,40662
0,907563.23824,89.0,97 � 3600
η
b
= 0,069793 η
b
= 6,9793
P = 620 watt = 0,620 kW
⇒
n= 4352rpm ṁf = 1,08 kgjam
LHV = 23824,89 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,620
1,08.23824,89.0,97 � 3600
η
b
= 0,089427 η
b
= 0,089427
P = 820 watt = 0,820 kW
⇒
n= 4370 rpm ṁf = 1,2 kgjam
LHV = 23824,89 kjkg
Universitas Sumatera Utara
89
η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,820
1,2.23824,89.0,97 � 3600
η
b
= 0,106447 η
b
= 10,6447
P = 836 watt = 0,836 kW
⇒
n= 4169 rpm ṁf = 1,255814 kgjam
LHV = 23824,89 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,836
1,255814.23824,89.0,97 � 3600
η
b
= 0,1037 η
b
= 1,037
P = 834,2 watt = 0,8342 kW
⇒
n= 4024 rpm ṁf = 1,301205 kgjam
LHV = 23824,89 kjkg η
b
= �
�
ṁ
�
. ���.
η
�
� 3600 η
b
= 0,8342
1,30120.23824,89.0,97 � 3600
η
b
= 0,099868 η
b
= 9,9868 Tabel 4.15 Efisiensi thermal pengujian menggunakan bahan bakar P50+E50
Bahan Bakar
Paramet er
Perform ansi
Jumlah beban lampu 100 Watt 2
4 6
8 10
12
P 50 + E50
n rpm
4280 4329
4352 4370
4169 4024
P Watt
202,5 406,6
2 620
820 836
834,2
LHV kJkg
23824 ,89
23824 ,89
23824 ,89
23824 ,89
23824 ,89
23824 ,89
ṁf kgjam
0,824 427
0,907 563
1,08 1,2
1,255 814
1,301 205
η
b
0,038 0,069
0,089 0,106
0,103 0,099
Universitas Sumatera Utara
90 262
793 427
447 7
868
4.4.4 Efisiensi termal yang dihasilkan bahan bakar P50 + E 5097,5 + H2,5