Learn how Eqobrush continuous chiller cleaning system helps to improve energy efficiency in Chinese buildings without investment. By avoiding the settlement of any fouling the chillers keep running at optimal performance at all times and >10% electricity can easily be saved. Any building operator running water-cooled chillers feel free to contact us and apply.

1. Eqobrush
Energy Performance Contract
for Chillers

2. Air Conditioning Problems?
Ever called over the air-con repair man to your home and
watch him fix the performance problem by simply cleaning the
outdoor condenser?
Did you realize that he did not only fix the problem but that
because of the cleaning the electricity consumption of the
unit dropped considerably?
Your unit was having problems releasing the heat from your
room to the outdoor…
Mechanical cooling is based on the
principle that liquids absorb energy (heat)
during evaporation and release this during
condensation.

3. Water cooled chiller operation
Chillers are the
single largest
energy-using
component in
most facilities
and can
typically
consume over
50 percent of
the electrical
usage.
https://www.achrnews.com/artic
les/92941-maximizing-chiller-
efficiency

4. Cooling tower water issues
• High mineral: scaling
• Algae: slime
• Dust, sand and other debris
Result:
• Fouling of the condenser tubes.
• Loss of effective heat exchange
• Increased electricity consumption
Water that circulates over an
open cooling tower with the purpose
to dissipate heat via evaporation is
the main cause of fouling in the
condenser tubes.

5. Chiller condenser fouling
US department of energy
https://www.achrnews.com/articles/92941-maximizing-chiller-efficiency
The Chinese University of Hong Kong
(Application research in Swire properties)
http://www.swireproperties.com/webs/ehs2006/02-sponge-
ball%20automatic%20tube%20cleaning%20device%20for%20saving%20energy.pdf
Fact:
Every chiller wastes energy on fouling between
cleaning cycles
We estimate 30%
energy spill in chillers
due to fouling
Over 12% energy saving
realized with automatic
chiller condenser cleaning

6. Fouling Impact on Energy Use
The relation between scale build-up,
and the increase in power
consumption is illustrated in the
Fouling Factor Table.
Fouling
Factor
FF
Scale thickness
in mm
Power increase
required
0.000 0.000 0.00%
0.0001 0.03 1.1%
0.0005 0.15 5.5%
0.0010 0.30 11.0%
0.0020 0.61 22.0%
0.0030 0.91 33.0%
0.0040 1.22 44.0%
1 mm fouling  30% power consumption increase

7. “This problem does not apply to us”
• Chiller performance monitoring:
– Monitor power consumption
– Monitor cooling tower heat rejection
• Verify your system: is the kWh/RT ration
stable or does it increase between
cleaning cycles
• 6 months free monitoring prior to
deciding to use Eqobrush
www.monitor-box.com
Our chillers are
special. They
don’t foul.

8. The value of
brushing
The cavemen started brushing
their teeth regularly once they
found out that “fresh” build-up is
easy to remove, as opposed to
leaving it untouched and allow
scaling.
That’s exactly what the tubes of
your chiller condenser need:
regular brushing to clean any
build-up before scaling sets in.
Regular and frequent brushing avoids scaling problems

9. Eqobrush Chiller Condenser Cleaning
• Water propels brushes through
each condenser tube every 4 hours
• All fresh fouling is removed
before it has chance to harden
• System runs automatically and
independent from BMS, worry free
and minimal operating cost
Keep chiller tubes free of fouling during operation by using the
power of water.

10. Eqobrush’s Energy Performance Contract
 Modeled after US/China initiative
 Motivate building owners to become energy efficient on chiller management
 Cost savings pay for the system
 Gain system ownership in 2 years without investment
http://www.globalchange.umd.edu/technology-and-policy/epc/

11. Business Model
 Eqobrush is installed on a clean chiller
 We monitor the energy consumption per cooling unit (kWh/RT)
www.monitor-box.com
 Guaranteed average electricity saving >10%
 Approx. 75% of the energy saving is paid
back for a period of 24 months
(payable per 6 months)

12. Chiller size in Refrigeration Ton
Chiller capacity is usually
expressed in RT or
Refrigeration Ton:
the amount of heat
required to melt one ton of
ice within 24 hours.
Hotel chillers normally range
from 200 RT to 1000 RT, but
sizes up to 5000 RT can be
found as well.
A mix of larger and smaller
chillers is normally installed.
This allows optimizing for
partial loads throughout
seasons.

13. Energy Performance Contract details
200 RT 500 RT 1000 RT
Electricity
consumption
120 kW 300 kW 600 kW
Annual Electricity
cost
¥ 390K ¥ 1 million ¥ 1.9 million
Saving annual ¥ 39K ¥ 100K ¥ 190K
System Cost 4 x ¥ 16.5K 4 x ¥ 30K 4 x ¥ 66K
Total saving * ¥ 519K ¥ 1.38 million ¥ 2.61 million
Chiller CAPEX
(estimated)
¥ 340K ¥ 850K ¥ 1.7 million
Electricity cost: RMB 0.90 / kWh
Annual running hours: 3600
(40% of max)
Energy saving: 10%
Contract period: 2 years
* Total saving calculated over a functional lifespan of 15 years and does not
consider savings on cleaning cost.
Remark: Data generated for China conditions

14. Responsibilities Wacon
• Deliver system Eqobrush including all components
• Supervise installation
• Training and user manual
• Inspection service (4x in 2 years)
• Provide insight in efficiency development via monitoring system

15. Responsibilities Client
• Prepare clean chiller for installation
• M&E installation crew with tools available for installation
(3 people, 2 days on a 500RT chiller)
• Provide internet connection for monitoring

16. Part 2
Technical details.

18. EQOBRUSH benefit overview
 Upto 40% Energy Savings
 Reduction of machine down-time for cleaning
 Reduction of chemicals for water treatment and
periodical cleaning
 Increased production capacity
 Reduction of water consumption (higher cycle of
concentration)
 Extend equipment lifespan (+20%)

19. Benefit: Energy saving
The Graph illustrates potential savings for
different condenser sizes based on 0.00025
FF with EQB, compared to 0.002 FF without
EQB

20. System components – Brushes and Catch baskets
 Durable: 3-5 years
 PE, stainless steel,
nylon
 Baskets cemented to
tube ends
 Clip system allows
brush replacement
without removing
baskets
Once installed, the
brushes and
baskets do not
narrow the flow
area.
No pressure loss to
the system.

21. System components – Reversal Valves
o Zero Cross-Over
o Variations to fit any pipe configuration
o Steel, SS304, SS316, titanium
o Pressure levels up to PN25
o Up to pipe diameter 600mm
o Pressure loss <0.05 bar

22. Brush vs Ball cleaning
 Low system maintenance, minimal replacement
cost
 All pipes get brushed on each cycle  all pipes
remain clean
 Strainer to catch balls is not fully effective, balls
get lost and need replacement. Requires
inspections and increases operating cost
 Pipes in “slow zone” of unit (outside) get less
cleaning cycles
Read more here:
https://www.watco-group.co/online-cleaning-solutions-heat-exchangers-condensers-compared/

23. Thank you!