ICEMAN

Snow generating test at Hakuba Happoone Japan, November 25, 2006

Snow generating test at Hakuba Happoone

Humidity 33.5% R.H.
Temperature: 3.7

C (38.6

F)
Wet valve temperature -0.9

C (33.6

Artificial Snowmaking Accelerator SNOW ACCELA
This is an epoch-making artificial snow acceleration system, which enables any snow machine to generate artificial snow at an external temperature between -3 to +5

C (37.4

41deg.F).

Additionally, installing a SNOW ACCELA unit on an ordinary snowmaking machine (fan type and gun type) enables you to expand a possible operating temperature range.

SNOW ACCELA provides a condensation function to spouting super-cooled water droplets. This starts off a chain reaction to instantaneously transform water droplets into snow. In a conventional case, sprayed water droplets fall as rain as it is in such a temperature range, but SNOW ACCELA forcibly changes them into snow.

Typical example of using SNOW ACCELA

It raises the snowmaking limit temperature of a snow machine.
No snow machine has normally been capable of generating artificial snow unless it is operated at an external temperature of -3

C (26.6

F) or less. Using this system enables any snowmaking machine to generate artificial snow within the range from -3

C (26.6

F) (see Note 1). Furthermore, the required energy for a snow machine with water volume of 200 liters/min (air 6 m³/min) is only 35 kW for a compressor, 4.5 kW for a refrigeration compressor, and 0.5 kW for auxiliary equipment. When compared with artificial snowmaking method based on making ice, it is possible to operate the system at 1/20 or less of the electricity consumption.

In the case of any ice-making method, at least 350 kW of electricity include ice blow system is required to make ice from 150 tons =water volume 100 L/min in 24 hours. A SNOW ACCELA requires only about 41 kW including the compressor when compared with this (see Note 2)

Note 1:	There are external temperature conditions for transforming into snow.
Note 2:	Power for a snow machine is not included. It is necessary to pay attention to the difference in water volume.

Humidity conditions

SNOW ACCELA Calculation		Wet bulb temperature C / F
SNOW ACCELA Calculation		0 C (32 F)	-1 C (30.2 F)	-2 C (28.4 F)	-3 C (26.6 F)	-4 C (24.8 F)	-5 C (23 F)
C / F Dry bulb temperature	7 C (44.6F)	19.9%	9.0%	-	-	-	-
	6 C (42.8F)	27.7%	16.0%	4.8%	-	-	-
	5 C (41.0F)	36.6%	24.0%	11.9%	0.3%	-	-
	4 C (39.2F)	46.7%	33.2%	20.2%	7.6%	-	-
	3 C (37.4F)	58.1%	43.5%	29.5%	16.0%	3.0%	-
	2 C (35.6F)	70.9%	55.3%	40.2%	25.7%	11.7%	-
	1 C (33.8F)	85.3%	68.5%	52.3%	36.7%	21.7%	7.1%
	0 C (32.0F)	100.0%	83.5%	66.1%	49.3%	33.1%	17.4%
	-1 C (30.2F)	-	100.0%	81.5%	63.5%	46.1%	29.2%
	-2 C (28.4F)	-	-	99.0%	79.6%	60.9%	42.7%
	-3 C (26.6F)	-	-	-	97.8%	77.6%	58.1%

It is possible to make artificial snow within the range marked in white.
In the range marked in blue, the snowmaking volume will be reduced.
Data prepared by Fukuoka Industrial Technology Center, Mechanical and Electronic Engineering Laboratory

The value in the red frame will approximate the value from a measuring instrument and is shown in the upper part of the page.

Range of calculation

Dry bulb temperature	C	+7 -3
Wet bulb temperature※	C	0 -5	*Icing condition
Saturated water vapor approximate coefficient	Water	6.04179E + 02	7.26794E - 02
Saturated water vapor approximate coefficient	Ice	6.13409E + 02	8.53157E - 02

Using a SNOW ACCELA unit enables you to set the upper limit of the external temperature at + 5

C (41

F) for your snowmaking operation. It is fundamental, however, that the external temperature at which sprayed water transforms into snow should be 0

C (32

F) or less. Operate the snow machine after considering the temperature conditions at which it should be operated based on the humidity table on this page. For example, when the external temperature is -1

C (30.2

F) and the humidity is 60%, nearly 100% of water will be transformed into snow without fail. For example, when the external temperature is +4

C (24.8

F) with humidity at 30%, the wet bulb temperature obtained from the table is -1

C (30.2

F), which means the sprayed water will be transformed into snow without fail.

Applying SNOW ACCELA to a gun type snow machine
When setting up the external temperature condition, branch off the compressed air piping at 5 to 7 m³ /min. (175

250ft³) per a unit of a snow gun from the existing compressor and connect it up a SNOW ACCELA unit. The generated snowmaking acceleration air will come in contact with sprayed water from the snow machine, changing the total volume into snow. It is possible to manufacture a special spraying nozzle as an optional item.

Applying SNOW ACCELA to a fan type snow machine
As in the case of the gun type snow, compressed air is required. It is necessary to have compressed air at 5 to 7 m³ /min. (175

250ft³) per each snowmaking machine. Generate snowmaking acceleration air by connecting compressed air piping to the SNOW ACCELA. Supplying your snow machine with sprayed water will transform the total volume of spraying water into snow. A special nozzle for a fan air supply opening is available as an optional item.

Table of specifications for SNOW ACCELA

SNOW ACCELA	SA-700E	SA-1350E	SA-2000E
Number of snow machine units to be connected	1	2	4
Air supply conditions (local supply portion)	Value at atmospheric pressure
Required air volume (Nm³/min. atmospheric pressure)	7.0 m³	14.0 m³	25.0 m³
Air pressure (Mpa) / (Psi)	0.4 0.98Mpa ( 58 142Psi )
Air temperature (C) / (F)	+15 C +5 C ( 59F 41F )
Air humidity (dew point)	Dew point at pressure + 10 C ( 50 F ) or less (Note 1)
Power supply	50 / 60HZ ： 200 / 220V 3P (Note 2)
Air cooling refrigerator	Air-cooling scroll compressor (inverter)
Rated output (kW/h)	4.5	7.5	14.8
Cooling capacity (kw)	1.2 / 1.3	2.0 / 2.5	3.8 / 4.1
Operating power consumption (kw/h) (Note 4)	1.9 / 2.5	3.3 / 4.3	6.1 / 8.1
Maximum operating current (A) (Note 4)	5.8 / 6.9	9.9 / 11.7	18.5 / 22.0
Installation dimensions Width W x Length L x Height H (mm) / (inch)	1400 x 2300 x 1750 mm (55" x 90" x 69" inch)	1640 x 2300 x 1750 mm (65" x 90" x 69" inch)	1950 x 2300 x 1750 mm (77" x 90" x 69" inch)
Weight (kg) / (lbs)	1250	1770	2150
Refrigerant used	R-404A
Evaporation temperature	-40 C -45 C (-40F -49F )
Attached sensors	Compressed air pressure, temperature, flow sensors
External temperature for operating equipment	+10 C -10 C (50F 14F )
Snowmaking acceleration air generation volume (Nm³/min.) / (Ft³)	4.7 7.1 (166 250ft³)	9.0 13.6 (318 480ft³)	16.0 24.0 (565 847ft³)

Conditions for snow machines

Water spray volume (L/min) / (gallon)	Design standard value 200L / min (53gallon)
Supply water temperature (degrees centigrade)	+5 C +2 C (41F 35.6F )
Supply air temperature (degrees centigrade)(Note 3)	+15 C +2 C (59F 35.6F )
External air condition for snowmaking	See the attached paper （Humidity conditions）

Note 1:	Use a drier-equipped compressor provided by your supplier.
Note 2:	For 220 V, it takes a longer time to manufacture a SNOW ACCELA unit.
Note 3:	For a gun type snow machine only (compressed air)
Note 4:	When the refrigerant evaporation temperature is -45 C (-49 F) and the external temperature is + 5 C (41 F).

SNOW ACCELA(SA-700E)

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