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Daicel Group

Sprinkling system for outdoor units

Patent pending

E mizu Shower

This system is equipment which reduces power consumption and power charges by improving air conditioning efficiency by sprinkling on the aluminum fins of the outdoor units of air conditioners. The existing sprinkler for outdoor units of air conditioners use tap water for sprinkling, the components of scale such as calcium and magnesium adhere on the aluminum fins of the heat exchanger, and cause troubles.
E mizu shower resolved the demerit of existing technology by sprinkling water after removing the scale components with RO membrane.

Features of E mizu Shower

Reduction of the electric power cost
The gaseous coolant returned from the indoor equipment releases the heat outdoors which has been taken as latent heat of vaporization in the room when it liquefies through compression and cooling in the outdoor units. During the summer, when the outdoor temperature is high, the efficiency of compression and cooling reduces by insufficient cooling, and power consumption increases. At that time, it is possible to reduce power consumption of the air conditioner by assisting cooling of the coolant by sprinkling on the aluminum fins of the heat exchanger.
Reduction of power by sprinkling becomes more effective as the temperature increases, and the effect of reducing the maximum demand is high. Therefore, the base rate of electricity can be reduced significantly.

Measures for Energy Saving Act
Reduction of CO2 in corporation unit is an issue because of revision of the Energy Saving Act. By reducing the electric power cost, it is possible to contribute to reduction of CO2 emission.

DAICEN's reverse osmosis membrane (RO membrane) is used.
Since the membrane module manufactured in the company is used, it is possible to provide the product with stable high-quality and low price.

Specifications of E mizu Shower

Model E mizu-50 E mizu-200D E mizu-350 E mizu-600
Permeate flow rate 50L/H 200L/hr 350L/hr 600L/hr
Dimensions (W x D x H) 600x250x800H 1300x550x900H 1300x550x1400H 800x1600x2300H
Weight during operation 50kg 190kg 270kg 1,100kg
Power source AV100V 50/60Hz Single-phase 100V 20A Single-phase 100V 20A Three-phase 200V
Power consumption 0.6kWh 1.1 to 1.5kWh 1.2 to 1.6kWh 3.5kWh
Connected piping 10A or 15A 15A 15A 20A
The number of outdoor units (fan/ mist) 1units / 4units 14units / 18units 19units / 25units 33units / 42units
Fan nozzle - 28piece (105kw) 38piece (143kw) 66piece (248kw)
Mist nozzle 14piece (28kw) 70piece (140kw) 100piece (200kw) 170piece (340kw)

Model E mizu-1000 E mizu-2000 E mizu-3000
Permeate flow rate 1000L/hr 2000L/hr 3000L/hr
Dimensions (W x D x H) 1600x1600x2300H 1600x1600x2300H 1600x1600x2300H
Weight during operation 1,800kg 1,850kg 2,000kg
Power source Three-phase 200V 50A Three-phase 200V 50A Three-phase 200V 75A
Power consumption 4.6kWh 5.0kWh 7.0kWh
Connected piping 25A 32A 40A
The number of outdoor units (fan/ mist) 55units / 71units 111units / 142units 166units / 428units
Fan nozzle 111piece (413kw) 222piece (833kw) 333piece (1245kw)
Mist nozzle 285piece (570kw) 570piece (1140kw) 857piece (1710kw)
  • This is the number of units when intermittent sprinkling of 1:1 is performed on the 10-horsepower outdoor units of fan nozzle specification.
  • This is the number of units when continuous sprinkling is performed on the 10-horsepower outdoor units of mist nozzle specification.
  • The number of outdoor units that can be installed also varies according to the form of the aluminum fins.

(As of December 2013)

Comparison of water quality of sprinkling

System performance

E mizu shower system uses reverse osmosis (RO) membrane, and sprinkles after purifying tap water and sterilizing with ultraviolet rays. The pictures below show the case tap water is sprinkled (left) and the case RO purified water is sprinkled (right) for comparison.
Adhesion of scales was observed with tap water as shown in the picture on the left, but it was not observed on the aluminum fins on which pure water was sprinkled as shown in the picture on the right. The customer who has used this system the longest has used the sprinkling for approx. 4 years, but there has been no troubles such as adhesion of scales and corrosion of aluminum fins.

The state of aluminum fins after sprinkling

Aluminum fins when tap water is sprinkled
The aluminum fins are clogged with scales.
Aluminum fins when RO treated water is sprinkled
There is no change with the aluminum fins, and the state when the sprinkling started is kept.

Water quality inspection

The 11 items of the water quality analysis program specified in [Sprinkling water quality standard] and a general bacteriological examination, 12 items in total, are performed once in a sprinkling period (1 season).

Sprinkling water quality level provided with E mizu Shower

RO water used by E mizu Shower
No. Item Standard value
1 PH(25℃) 5.8 to 8.0
2 Electric conductivity (ms/m) 3 or less
3 Acid consumption (mg/l) <1
4 Total hardness (mg/l) <1
5 Ionic silica (mg/l) <2
6 Chloride ion (mg/l) <1
7 Total iron (mg/l) <0.05
8 Total copper (mg/l) <0.01
9 Sulfate ion (mg/l) <0.5
10 Ammonium ion (mg/l) <0.01
11 Total residue on evaporation (mg/l) <10
12 Bacteria (/ml) <100
The water quality of circulating type makeup water of the Japan Refrigeration and Air Conditioning Industry Association
No. Item Standard value
1 PH(25℃) 5.8 to 8.0
2 Electric conductivity (ms/m) 30 or less
3 Acid consumption (mg/l) <50
4 Total hardness (mg/l) <70
5 Ionic silica (mg/l) <30
6 Chloride ion (mg/l) <40
7 Total iron (mg/l) <0.3
8 Total copper (mg/l) <0.03
9 Sulfate ion (mg/l) <50
10 Ammonium ion (mg/l) <0.1

Common factor Scale factor Corrosion factor

Contact number

Membrane Sales Department
  • Tokyo +81 (0)3-6631-3000