Savings calculat=
ion for AVR,
ACHTR and private systems
Our sy= stems save to the clients allot of money from the daily/monthly/yearly expenses by reducing energy cost, technical cost and other cost which most of us don’t notice them during the routine daily life. In this chapter we s= how by numbers those savings.
Industrial syst=
ems
Energy savings for open cooling systems:
The
The sy= stems prevent from scale and all kind of sediment to seat inside the cooling syst= ems and reducing the optimal heat transfer. The low efficiency of the heat tran= sfer cause to higher energy consumption. For example; 0.5mm of scale means, more 15% of energy.
Energy= saving calculation:
Number example;
284TR x=
1.7 x 5000óra/év x=
Є0.05kW/óra
x 15% =3D Є18,105 =
(1000kW=3D284TR)
(cooling capacity) x (compressor efficiency) x (yearly working time) x
(cost of kW/h) x (estimate saving) =3D
On the next page we introduce few chart and d=
iagrams
that was made by some of the mo=
st
known international companies which produce heat-exchangers, condensers and
cooling towers. We can see the effect of scale/se=
diment
on the efficiency of heat transfer and the work of the compressor efficienc=
y.
![](3D"savings-calculation-en_elemei/image002.jpg")
![](3D"savings-calculation-en_elemei/image004.jpg")
![](3D"savings-calculation-en_elemei/image005.gif")
Scale
thickness
fouling factor(ff) =
![](3D"savings-calculation-en_elemei/image007.jpg")
0.000̶=
1; =
clean tube
0.006̶=
1; =
&nb=
sp;
0.0005
0.012̶=
1; =
&nb=
sp;
0.001
0.024̶=
1; =
&nb=
sp;
0.002
0.036̶=
1; =
0.003
Energy
saving for close cooling systems:
One im= portant point that most people don’t know regarding close cooling systems it = is that those systems not close as we think. Still all kind of dirt, alga (look like black oil) and corrosion go through the cooling circulation and causin= g to energy lost and technical problems. In the chart below we can see the effec= t of those on the energy transfer efficiency.
If we look on the= other side of the cooling system, we find the fan-coils. The fan-coils are the la= st step between the cold water of the condencer system and the cold air that we feel inside the room. The fan-coil structure and = work reminding the structure and work of the car radiator. The sediment in the c= lose cooling system blocks the optimal energy transfer and blocks the fan-coils.= Due to the last mention, the fan-coils demand allot of maintenance, changing and use of energy for the cooling.<= o:p>
WATER CONDITIONING
TABLE – HEAT TRANSFER
SURFACE REQUIRED TO OFFSET FOULING
|
FOULING THERMAL RESISTANCE (hr) (sq ft) (deg F temp. diff.)/Btu |
OVER-ALL HEAT TRANSFER
COEFFICIENT** Btu/(hr) (sq ft) (deg F |
THICKNESS OF SCALE* (inch.) |
INCREASE
OF REQUIRED HEAT TRAN=
SFER
AREA*** (approximate %) |
|
|
Coller &nbs=
p;
Condenser |
|
Cooler Condenser |
|
Clean tubes 0.0005 0.001 0.002 0.003 |
400 &nbs=
p;
850 333 &nbs=
p;
595 286 &nbs=
p;
460 222 &nbs=
p;
315 182 &nbs=
p;
240 |
.000 .006 .012 .024 .036 |
0 &nbs=
p;
0 20 &nbs=
p;
45 40 &nbs=
p;
85 80 &nbs=
p;
170 120 &nbs=
p;
250 |
* Assume a mean value for the termal conductivity of the
scale of 1.0 Btu / (hr) (sq. Ft.) (deg F per ft).
** The over-all heat transfer coeffic=
ient
selected for this illustration are typical for a flooded cooler and a
water-cooled refrigerant condenser. However, beacuse it is possible to have
different over-all heat transfer coefficient depending on the system, the
effect on the over-all heat transfer by the scale will vary.
*** Sq ft of inside surface of tube in heat exchanger=
.
Chemicals
and softeners savings:
By using the AVR and the ACHTR there is no need to use any
chemicals or softeners. Not using those, bring to high savings expences for
purchesing their purchesing. Those savings can get to thousand
and dozens of Euro in each year.
Private systems
Our pr= ivate systems we divide to two:
1. The water treatment system for keeping cleans the washing mach=
ine,
boiler, dishw=
asher etc.
2. The drinking water system.=
The fi= rst mentioned systems are actually worked on the same idea of the industrial systems. Those systems are keeping clean the water and by this insure the h= igh efficiency of heat. All those house appliance work concern heat and cold changing. The changing made by heat transfer, clean appliance from sediment= =3D efficient energy use. Except that, there is no need to buy all kind of softeners that we usually buy in shops.
Our se= cond systems, the drinking water system, save money on a totally deferent way. Actually to calculate this saving each one of us can do and you don’t need to be engineer for doing it.
For st=
arting the
calculation we need to take an average cost of one bottle of mineral drinki=
ng water
that we can buy in every shop. We calculate that average
Mon=
ey saving:
1 bott= le/day x 365 (12 month) x 1 Euro =3D 365 Euro/year.
A cust= omer that buy our system need to pay almost half in the first year but, in next year = and the years which follow, the cost only around 68 Euro/year. This cost is due= for changing the filters and service, saving of more then 80%!. Therefore no mo= re high expenses! But high quality of water in minimum cost!