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Daikin EWLD800I-SS [3/36] Features and advantages
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ELWT fluctuation with steps capacity control (4 steps)
EWLT fluctuation with stepless capacity control
Features and advantages
The EWLD~I- chillers, featuring 1, 2 or 3 single screw compressors, are manufactured to satisfy the requirements of the
consultants and the end user. Units are designed to minimise energy costs while maximising the refrigeration capacities.
Daikin’s chiller design experience combined with outstanding features makes the EWLD~I- chiller unmatched in the industry.
Seasonal quietness
The compressor design with a single screw and twin rotors allows a constant gas flow. This compression process completely
eliminates gas pulsations. The oil injection also results in significant mechanical noise reduction.
The twin gas compressor discharge chambers are designed to act as attenuators, based on the harmonic wave principle
with destructive interference, thus always resulting equal to zero. The extremely low noise compressor performance affords
the use of EWLD~I- chiller for all applications.
The reduced number of vibrations produced from the EWLD~I- chiller offers a surprisingly quiet operation eliminating the
noise transmission through the structure and the chilled water piping system.
Infinitely capacity control
Cooling capacity control is infinitely variable by means of a
screw compressor controlled by microprocessor system.
Each unit has infinitely variable capacity control from 100%
down to 25% (one compressor unit), down to 12,5% (two
compressors units) and down to 8.3% (three compressors
units). This modulation allows the compressor capacity to
exactly match the building cooling load without any leaving
evaporator water temperature fluctuation. This chilled water
temperature fluctuation is avoided only with a stepless
control.
With a compressor load step control in fact, the compressor
capacity, at partial loads, will be too high or too low compared
to the building cooling load. The result is an increase in chiller
energy costs, particularly at the part-load conditions at which
the chiller operates most of the time.
Units with stepless regulation offer benefits that the units with step regulation are unable to match. The ability to follow the
system energy demand at any time and the possibility to provide steady outlet water temperature without deviations from the
set-point, are the two points that allow you to understand how the optimum operating conditions of a system can be met only
through the use of a unit with step-less regulation.
Code requirements – Safety and observant of laws/directives
All water cooled units are designed and manufactured in accordance with applicable selections of the following:
Construction of pressure vessel 97/23/EC (PED)
Machinery Directive 2006/42/EC
Low Voltage 2006/95/EC
Electromagnetic Compatibility 2004/108/EC
Electrical & Safety codes EN 60204–1 / EN 60335-2-40
Manufacturing Quality Stds UNI – EN ISO 9001:2004
time
Compressor Load
Building Load
Building Load
Compressor Load
Содержание
- Code requirements safety and observant of laws directives 3
- Features and advantages 3
- Infinitely capacity control 3
- Seasonal quietness 3
- Certifications 4
- Sound configuration 4
- Versions 4
- Cabinet and structure 5
- Ecological hfc 134a refrigerant 5
- Electronic expansion valve 5
- Evaporator 5
- General characteristics 5
- Refrigerant circuit 5
- Screw compressors 5
- Control section main features 6
- Electrical control panel 6
- Safety device logic for each refrigerant circuit 6
- Chiller sequencing 7
- Digital sequencing panel 7
- Microtech iii 7
- Microtech iii remote control 7
- Regulation type 7
- Serial sequencing panel 7
- Supervising systems on request 7
- System security 7
- Options on request 8
- Standard accessories supplied on basic unit 8
- Nomenclature 9
- Technical specifications 10
- Ewld i ss 17
- Sound levels 17
- Sound pressure levels correction for different distances 17
- Ewld i ss 18
- Operating limits 18
- Table 1 evaporator minimum and maximum water 18
- Table 2 evaporator fouling factors 18
- Table 3 minimum glycol percentage for low air temperature 18
- Table 3 minimum glycol percentage for low water temperature 18
- How to use the correction factors proposed in the previous tables 19
- Table 4 correction factors for low evaporator leaving water temperature 19
- Table 5 correction factors for water and glycol mixture 19
- Water charge flow and quality 20
- Water content in cooling circuits 21
- Ewld i ss 22
- Notes 1 cc cooling capacity 2 pi unit power input 3 hr heat rejection 4 elwt evaporator leaving water temperature δt 5 c 5 data refers to 0 0176 m2 c kw evaporator fouling factor 22
- Standard ratings 22
- Notes 6 cc cooling capacity 7 pi unit power input 8 hr heat rejection 9 elwt evaporator leaving water temperature δt 5 c 10 data refers to 0 0176 m2 c kw evaporator fouling factor 23
- Notes 11 cc cooling capacity 12 pi unit power input 13 hr heat rejection 14 elwt evaporator leaving water temperature δt 5 c 15 data refers to 0 0176 m2 c kw evaporator fouling factor 24
- 91 l s 25
- Evaporator and condenser pressure drops 25
- Ewld i ss 25
- How to use the formula example evaporator 25
- Pd2 kpa pd1 kpa x where pd2 pressure drop to be determinated kpa pd1 pressure drop at nominal condition kpa q2 water flow at new working condition l s q1 water flow at nominal condition l s 25
- The unit ewld320i ss has been selected for working at the following conditions evaporator water in out 11 6 c saturated discharge temperature 40 c the cooling capacity at these working conditions is 333 kw the evaporator water flow at these working conditions is 15 1 l s the unit ewld320i ss at nominal working conditions has the following data evaporator water in out 12 7 c saturated discharge temperature 45 c the cooling capacity at these working conditions is 328 kw the evaporator water flow at these working conditions is 15 7 l s the evaporator pressure drop at these working conditions is 34 kpa the evaporator pressure drop at the selected working condition will be pd2 kpa 34 kpa x pd2 kpa 35 kpa note if the calculated evaporator water pressure drop is below 10 kpa or above 100 kpa please contact the factory for dedicated evaporator 25
- To determinate the evaporator or condenser pressure drop for different versions or at different working condition please refer to the following formula 25
- Dimensions 26
- Handling 29
- Installation notes 29
- Location 29
- Minimum clearance requirements for machine maintenance 29
- Minimum space requirements 29
- Warning 29
- Dimensions 30
- General 30
- Noise level and vibrations 30
- Performance 30
- Refrigerant 30
- Technical specification for water cooled screw chiller 30
- Unit description 30
- Chiller components 31
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