Ferroli RGA HE series User Manual

38
Correction factor for the use of glycol in cooling mode
ETHYLENE GLYCOL with water produced between 5 ÷ 20 º C.
PROPYLENE GLYCOL with water produced between 5 ÷ 20 º C.
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
CCPF - Cooling capacity 1,00 0,99 0,98 0,97 0,95
CCPA - Power input 1,00 1,00 0,99 0,99 0,98
CCQA - Water flow rate 1,00 1,04 1,08 1,12 1,16
CCDP - Water pressure drop 1,00 1,08 1,16 1,25 1,35
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
CCPF - Cooling capacity 1,00 0,98 0,96 0,94 0,92
CCPA - Power input 1,00 0,99 0,98 0,95 0,93
CCQA - Water flow rate 1,00 1,01 1,03 1,06 1,09
CCDP - Water pressure drop 1,00 1,05 1,11 1,22 1,38
Based on outdoor air temperature and leaving water temperature of the evaporator (DESIGN CONDITIONS) from the table
“performances” extract Cooling Capacity (kWf) and Compressors Power Input (kWa).
Based on type and percentage of glycol extract CCPF, CCPA, CCQA, CCDP.
Then calculate.
 Pf_brine=kWfxCCPF
 Pass_CP_brine=kWaxCCPA
Then calculate brine ow rate of the evaporator:
 Q_brine_evap[l/s]=CCQAx(Pf_brine[kW]*0.86/∆T_brine)/3.6
where ∆T_brine is the difference inlet-outlet evaporator water temperature:
 ∆T_brine=Twin_evap_brine-Twout_evap_brine
With this brine ow rate enter in abscissa on the water pressure drop of the evaporator then you have Dp_app.
Finally you can calculate the actual pressure drop of the brine on evaporator side:
 Dp_evap_brine=CCDPxDp_app
TECHNICAL DATA - BASE VERSION (VB)
Fouling factors
The performances supplied with the tables are referred to a fouling factory = 0.44x10
-4
m² K/W . For different values of the fouling
factory, use the reduction coefficients reported in the following table.
F.c. PF: Correction Factor for Cooling capacity
F.c. PA: Correction Factor for compressor power Input
Fouling factory
Evaporator
F.c. PF F.c. PA
(m² K / W) 0,44 x 10
-4
1,00 1,00
(m² K / W) 0,86 x 10
-4
0,98 0,99
(m² K / W) 1,72 x 10
-4
0,93 0,98

Ferroli RGA HE series Specifications

General

Brand	Ferroli
Model	RGA HE series
Category	Chiller
Language	English