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Daikin EWLD420I-SS [5/36] General characteristics
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General characteristics
Cabinet and structure
The cabinet is made of galvanized steel sheet and painted to provide a high resistance to corrosion. Colour Ivory White
(Munsell code 5Y7.5/1) (±RAL7044).The base frame has eye-hook for lifting the unit with ropes for an easy installation. The
weight is uniformly distributed along the profiles of the base and this facilitates the arrangement of the unit.
Screw compressors
The single-screw compressor has a well balanced compression mechanism which cancels the screw rotor load in both the
radial and axial directions. Inherent to the basic single-screw compressor design is the virtually load-free operation that gives
main bearing design life of 3-4 times greater than twin-screws, and eliminates expensive and complicated thrust balancing
schemes. The two exactly opposed gate rotors create two exactly opposed compression cycles. Compression is made at the
lower and upper parts of the screw rotor at the same time, thus cancelling the radial loads. Also, both ends of the screw rotor
are subjected to suction pressure only, which cancels the axial loads and eliminates the huge thrust loads inherent in twin-
screw compressors.
Oil injection is used for these compressors in order to get EER at high condensing pressure. EWLD~I- units are provided
with a high efficiency oil separator to maximise oil extraction.
Compressors have an infinitely variable capacity control down to 25% of its total capacity. This control is made by means of
capacity slides controlled by microprocessors.
Standard start is star-delta type; soft start type is available as option.
Ecological HFC 134a refrigerant
The compressors have been designed to operate with R-134a, ecological refrigerant with zero ODP (Ozone Depletion
Potential) and very low GWP (Global Warming Potential) that means low TEWI (Total Equivalent Warming Impact).
Evaporator
The units are equipped with a Direct Expansion shell&tube evaporator with copper tubes rolled into steel tubesheets. The
evaporators are single-pass on both the refrigerant and water sides for pure counter-flow heat exchange and low refrigerant
pressure drops. Both attributes contribute to the heat exchanger effectiveness and total unit’s outstanding efficiency.
The external shell is covered with a 10mm closed cell insulation material. Each evaporator has 1 circuit for each compressor
and is manufactured in accordance to PED approval. The evaporator water outlet connections are provided with Victaulic Kit
(as standard).
Electronic expansion valve
The unit is equipped with the most advanced electronic expansion valves to achieve precise control of refrigerant mass flow.
As today’s system requires improved energy efficiency, tighter temperature control, wider range of operating conditions and
incorporate features like remote monitoring and diagnostics, the application of electronic expansion valves becomes
mandatory. Electronic expansion valve proposes features that make it unique: short opening and closing time, high
resolution, positive shut-off function to eliminate use of additional solenoid valve, highly linear flow capacity, continuous
modulation of mass flow without stress in the refrigerant circuit and corrosion resistance stainless steel body.
EEXV strength point is the capacity to work with lower ΔP between high and low pressure side, than a thermostatic
expansion valve. The electronic expansion valve allows the system to work with low condenser pressure (winter time)
without any refrigerant flow problems and with a perfect chilled water leaving temperature control.
Refrigerant Circuit
Each unit has independent refrigerant circuits and each one includes:
• Single screw compressor with external cyclonic oil separator
• Evaporator
• Oil pressure transducer
• High pressure switches
• High pressure transducer
• Low pressure transducer
• Moisture liquid indicator
• High efficiency oil separator
• Replaceable core filter-drier
• Electronic expansion valve
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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