37
TECHNICAL DATA - BASE VERSION (VB)
Correction factor for the use of glycol in heating mode
ETHYLENE GLYCOL
with water produced between 30 ÷ 55 º C.
PROPYLENE GLYCOL
with water produced between 30 ÷ 55ºC.
Percentage Of glycol in mass / volume
0 / 0
10 / 8,9
20 / 18,1
30 / 27,7
40 / 37,5
Freezing point [°C]
0
-3,2
-8
-14
-22
CCPT - Heating capacity
1,000
0,995
0,985
0,975
0,970
CCPA - Power input
1,000
1,010
1,015
1,020
1,030
CCQA - Water flow rate
1,000
1,038
1,062
1,091
1,127
CCDP - Water pressure drop
1,000
1,026
1,051
1,077
1,103
Percentage Of glycol in mass / volume
0 / 0
10 / 9,6
20 / 19,4
30 / 29,4
40 / 39,6
Freezing point [°C]
0
-3,3
-7
-13
-21
CCPT - Heating capacity
1,000
0,990
0,975
0,965
0,955
CCPA - Power input
1,000
1,010
1,020
1,030
1,040
CCQA - Water flow rate
1,000
1,018
1,032
1,053
1,082
CCDP - Water pressure drop
1,000
1,026
1,051
1,077
1,103
Based on DESIGN CONDITIONS from the table “performances” extract Heating Capacity (kWt
r
).
Based on type and percentage of glycol extract CCPT, CCQA, CCDP.
Then calculate.
Pt_brine = kWt
r
x CCPT
Pass_CP_brine = kWa x CCPA
Then calculate brine flow rate to the heat recovery exchanger:
Q_brine [l/s]=CCQA x (Pt_brine [kW]*0.86/
∆
T_brine)/3.6
where
∆
T_brine is the temperature difference outlet-intlet heat recovery exchanger:
∆
T_brine=Twout_brine-Twin_brine
With this brine flow rate enter in abscissa on the water pressure drop of the heat recovery then you have Dp_app.
Finally you can calculate the actual pressure drop of the brine on heat recovery:
Dp_brine =CCDP x Dp_app
