Material balance approach & the fundamental perspective
1)-1. The basic approach: material flow cycle
Material balance approach puts emphasis on the concept of material flow cycle. In general perspective it provides a fundamental explanation about the reason why these situations occur and cause the problems. Resources taken from the nature are consumed in human’s activity and particularly an
Solid Source
each cell is loaded with a charge material, usually a pure element like gallium or arsenic, which is solid at room temperature.
The gaseous atomic or molecular beam is generated by heating the charge in the effusion cell in the growth chamber.
The effective beam pressure or flow rate of the gas, called the beam flux, is varied by adjusting the effusion cell temperature.
A
flow[kg/hr]
mole fraction
WATER
39392.7394
0.77417305
ETHANOL
29260.7275
0.22487379
CO2
118.481529
0.00095315
표 8. VAP1 stream
2) Separation Model
foolish model 이후 순수한 ethanol을 얻기 위한 separtion공정이다.
① D1 unit (distillation)
원할한 azeotropic distillation을 하기 위하여 별도의 Distillation 유닛을 달아 separartion model로 들
Flow Diagram)
3.2. 공정물질수지
Fig 3.2 Material Balance Summary
원하는 연간 생산능력을 맞추기 위해 플랜트에 유입되는 원료 흐름양이 결정되어야 한다. 앞에서 (주)가야에너지로부터 얻은 PFD를 통해서 바이오디젤 연간 8000톤 생산의 공정에 대한 물질 수지를 세워 보았다.
4. 플랜트 관련 비용 계
CASE 4
Part 1:
A. Describe the cost flow assumptions used in average cost, FIFO and LIFO methods of inventory valuation.
-The average cost method assumes cost of goods sold and ending inventory consist of a mixture of all the goods available for sale. The average unit cost applied to goods sold or to ending inventory is not simply an average of the various unit costs of purchases during the pe