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Catalogue Samurai Range Screw Type Water Chillers

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Hitachi Air-conditioning & Refrigeration Division - 90692, 90403

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Low Noise & Super Low Noise

Sound levels and vibration are key factors during the operation of a chiller. In many applications it may be necessary to limit the sound level to permitted values, depending

on local regulations.

The SAMURAI chillers operate at low sound and vibration levels due to the technical development of the HITACHI semi-hermetic screw compressors supplier, precise machining

and meticulous assembly during the production process. The compressors suppliers are mounted on rubber pads that protect the structure of the chiller from possible compressor vibrations, which is why the overall result is absolutely balanced.

Low Sound

Hitachi uses high technology to achieve the lowest sound. The new two bladed propellers, rather than four bladed, achieves a reduction of noise level, increases air flow volume, and at the same time provides an important reduction of motor power input.

Reciprocating

Samurai

The compressors are installed in an enclosure and covered with acoustic insulating material to further reduce the sound level as far as possible. The fans are also specifically designed to reduce noise while permitting sufficient

circulation of air for the correct operation of the unit. The new AG2 unit is fitted with a DC Inverter Fan

in order to adapt the air flow more efficiently and therefore control the discharge pressure and the acoustic impact. It is also possible to select

the unit with the "Low Noise and Super Low Noise" options. In this case, the insulation of the compressor

enclosure increases. Therefore it is possible to achieve a further

reduction of 4 dBA. These features

of the SAMURAI chiller can help to reduce the overall installation costs as it can eliminate the need for any

acoustic screens or external sound

attenuation packages.

-10

-20

0.02 0.04

0.06 0.08 Time (seconds)

0.10

0.12

Vibration Amplitude for the HITACHI Screw Compressor.

Sound Power Values (dBA)

COMPETITOR Y

SAMURAI

SAMURAI (with Low Noise Level Option)

200

400

600

800

1000

1200 kW

Excellent Partial Load

Performance

As the Samurai utilizes continuous capacity control it is able to match the required cooling capacity accuratey. This enables the Samurai to control on outlet water temperature rather than inlet. Additionally, thanks to the meticulous design of the control system, the performance of the unit at partial loads is excellent. As can be seen, the variations in the input capacity are smaller than the variation of the unit's cooling capacity. This leads to an increased COP at partial loads and a significant advantage over competitor's chillers.

ESEER (In accordance with Eurovent)

The ESEER (European seasonal energy efficiency ratios) are published in the opposite table for the AG2 chiller. This indicates the average energy efficiency at part load based upon the four operating conditions defined by Eurovent.

Air Cooled Models Efficiency at Partial Load

6.0 5.5 5.0 4.5 4.0

(Ambient Temperature)


		45°C
	—m—	40°C
		35°C
	X	30°C
	—	25°C
	—•—	20°C

3.5

3.0

2.5

2.0

1.5

1.0

140 (%) Cooling Capacity

OPERATIONAL COST SAVING (*)

Annual Power Consumption (KW/h/year)

SAMURAI

Reciprocating Type

Step

Capacity

Control

Continuous Capacity

Control

100%

87%

66%

(.) Based on Typical thermal load for air co ditioning. HITACHI'S comparison.

Model 40AG2 50AG2 60AG2 70AG2 80AG2

100AG2 120AG2 140AG2 160AG2 180AG2

210AG2 240AG2 280AG2 320AG2 350AG2 400AG2

ESEER

3.21

J.bb

3.5"

3.5

3.48

3.58

3.49

3.48

3.5

3.5"

3.48

3.5

3.48

3.5

3.48