BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...

192 Aurora Alexandrescu et al.
(7)
(8)
The annual medium marginal cost is calculated with the fallowing equation:
( + )
α/ β
p
C .
A La . ⎛ γ
Q ⎞ Ipo ap⎛1,15. KN. QLJ . . ⎞
CM = = . ⎜Kj. + .
+
W W ⎜
⎟
⎜ ⎟
J ⎟ W ⎜ ⎟
⎝ ⎠ ⎝
ηp
⎠
αγ / β
pE.1 krE . KN. QLJ . . Q
αp αp
+ = A*. + BQ . . J + CQJ . . ;
3600. η
α/ β
J
p
( )
p
La . α/ β Ipo. ap⎛1,15.
KN. L⎞
pE.1 + krE . KN. L
A* = . ( K j ) ; B= . ⎜ ⎟ ; C =
.
W W ⎜ ⎟
⎝
ηp ⎠
3600. ηp
The minimum marginal cost has the following configuration:
αγ
∂CM α Q β
αp αp−1 = 0 ⇒− A. . + B. α p.
Q . J + C.
Q = 0
∂Jϕ α
1+
β
J
3. Results and Discussion
The available data for choosing the proper pumping device require a careful
analysis to determine the head characteristics of the pressurized supplies for
each specific configuration and to evaluate the proper operational regimes of the
pumping devices. The calculation method is applied in the exoneration case of
pumping station CUG Iasi for drinkable water from Iasi city.
Before of exoneration the pumping station CUG Iasi has been equipped
with two 8 NDS pumps; after exoneration the pumping station CUG is equipped
with two Wilo NPG 200-500-160/4/499 pumps.
The measure and control system of drinkable water’s quality, of functional
parameters of the pipes network from CUG pumping station has been complete
automated in August – December 2008 with performance installations by
Endress Hauser concern. All system has automated calculus program that
permits of the dispatcher from S. C. APAVITAL S. A. Iasi industry to pursue
the parameters’ network in 17 demurrages from the supply system with
drinkable water of Iasi town, (Fig. 1). The registering is permanent, 24 hours.
The water samples are analyzed automatic at each 2 ÷ 5 minutes. Drinkable
water is treated with ammonium and chlorine in accordance with the properties
of the analyzed water.
α
α