Condensation occurs when moisture in the air condenses into water droplets on a cool surface whose temperature is below the dew point. The quantity of condensate depends on factors like the temperature of chilled water entering air handling units, relative humidity of fresh and return air, air handling unit capacity and airflow volume. In Hyderabad, relative humidity ranges from 70-85% during monsoons, 50-70% in summer, and 25-50% in winter. At one building (B7), approximately 10-12 kiloliters of condensate is collected daily when 37 air handlers are running, and an estimated 15-18 kiloliters when all 62 are operating. This condensate water can be treated
1. Condensation
water that collects on a cool surface
because the temperature of the surface
is below the point at which moisture in
the air forms as water droplets.
1E Venkata Raju - Building Manager
5. Quantity of condensate depends on
1. Temp of chilled water @ inlet to AHU
2. Percentage of RH in fresh air
3. Percentage of RH in return air
4. Capacity of AHUs
5. Volume of chilled flow
6. Volume of air flow
In Hyderabad , More RH during monsoons (70 to
85%), in summer 50 to 70% and in winter 25 to
50%.
E Venkata Raju - Building Manager 5
6. Approximate Condensate quantity
@B7
• Based on our intermittent collection sample
reports at individual AHUs , floor AHUs ,
south wing AHUs and north wing AHUs in the
last 3 to 4 months , it is approximately 10 to
12 KL per day ( when 37 AHUs running).
• Assumed 15 to 18KL per day (When 62 AHUs
running)
E Venkata Raju - Building Manager 6
7. Quality of condensate water @B7
1.Hardness 0 to 2 ppm
2. TTDs 30 to 40 ppm
3. PH 6 to 7
4. Clear water
5. Temp 15 to 20 deg.C
E Venkata Raju - Building Manager 7
8. Usage of collected condensate water
1.As drinking water
2.As domestic water
3.As CT water
E Venkata Raju - Building Manager 8
9. For Drinking- Scheme
• Approximate cost : RS 2.50 lacs
• Savings/Earnings : 6000 (Ltrs) x 20 (days) x Rs.1.00
(per ltr)x 12(months) = 14.40 lacs /year
• Note :Every high purity of raw water , output is 80 to90% .
E Venkata Raju - Building Manager 9
Condensate
water
Nano
filtration/ RO
UV
dis infection Chlorination
Lab testing as per
drinking water standardsDrinking tank
10. For domestic purpose- Scheme
• Approximate cost : Rs 20000/-
• Savings/earnings: 12,000 (ltrs)x Rs0.30 x 26
days x 12 months= 11,23,200/- year
E Venkata Raju - Building Manager 10
Condensate
water
Multi grade
filter
Manual/auto
Chlorination
Domestic
tank
11. For CT water- Scheme
• Approximate cost : Rs 15000/-
• Savings : No chemicals required , no scale formation , no
bleed off , less power consumption in chillers :
Approximately Rs 75 to 80 lacs per year.
E Venkata Raju - Building Manager 11
Condensate
water Sand filter Collection
tank
13. B7 Proposed plan to collect condensate water from all AHUs
E Venkata Raju - Building Manager 13
14. Cost estimation
• 1. As per quote by Hiline : Rs 1.5 lacs
• 2. As per our estimate and as per standard
design : Rs 75,000/-
• 3. As per present available material : Rs
25000/- (May not be as per standard , but it is
good and suitable for our requirement)
E Venkata Raju - Building Manager 14
