経済的な散水かんがい設備に関する研究 (その2)
各種原動機の年間利用時間と経費の関係について
1961 年 22 巻 4 号 p. 139-142
詳細
1961 年 22 巻 4 号 p. 139-142
The relation between the hours in and the expense for operating a sprinkler has been studied, employing kerosine, gasoline, diesel engines and electric motor. The results of calculation of the expense for driving and maintenance of these engines under various conditions have revealed the following facts.
1) The expense per hour is adversely proportional to the length of operating hours in a year, and this tendency is emphasized in case an electric motor is employed.
2) As to the internal combustion engines, a gasoline engine is the most expensive, being followed by a kerosine and diesel engine in order.
3) An electric motor is the most economical when the operating hours in a year is long and the distance between the three-phase line and the setting situation of the motor is short, but it is not the case if such conditions as abovementioned would not be satisfied.
4) Generally speaking, a great difference in the expense will be produced among the various kinds of engines when they are driven for a long period of time, though there appears little difference when they are driven for a short period of time.
