![Daikin EWLD420I-SS [31/36] Chiller components](/img/pdf.png)
Daikin EWLD420I-SS [31/36] Chiller components
![Daikin EWLD600I-SS [31/36] Chiller components](/views2/1667993/page31/bg1f.png)
31
CHILLER COMPONENTS
Compressors
9 Semi-hermetic, single-screw type with one main helical rotor meshing with gaterotor. The gaterotor will be
constructed of a carbon impregnated engineered composite material. The gaterotor supports will be constructed of
cast iron.
9 The oil injection shall be used in order to get high EER (Energy Efficiency Ratio) also at high condensing pressure
and low sound pressure levels in each load condition.
9 Refrigerant system differential pressure shall provide oil flow throught service replaceble, 0.5 micron, full flow,
cartridge type oil filter internal to compressor.
9 Refrigerant system differential pressure shall provide oil injection on all moving compressor parts to correctly
lubricate them. Electrical oil pump lubricating system is not acceptable.
9 The compressor’s oil cooling must be realized, when necessary, by refrigerant liquid injection. External dedicated
heat exchanger and additional piping to carry the oil from the compressor to heat exchanger and viceversa will be
not accepted.
9 The compressor shall be provided with an external, high efficiency, cyclonic type oil separator and with built-in oil
filter, cartridge type.
9 The compressor shall be direct electrical driven, without gear transmission between the screw and the electrical
motor.
9 Shall be present two thermal protection realized by a thermistor for high temperature protection: one temperature
sensor to protect electrical motor and another sensor to protect unit and lubricating oil from high discharge gas
temperature.
9 The compressor shall be equipped with an electric oil-crankcase heater.
9 Compressor shall be fully field serviceable. Compressor that must be removed and returned to the factory for
service shall be unacceptable.
Cooling capacity control system
9 Each unit will have a microprocessor for the control of compressor slide valve’s position and the instantaneous
RPM value of the motor.
9 The unit capacity control shall be infinitely modulating, from 100% down to 25% for each circuit (from 100% down to
12,5% of full load for unit with 2 compressors and 8,3% for units with 3 compressors). The chiller shall be capable
of stable operation to a minimum of 12,5% of full load without hot gas bypass.
9 Step unloading unacceptable because of evaporator leaving water temperature fluctuation and low unit efficiency at
partial load.
9 The system shall stage the unit based on the leaving evaporator water temperature that shall be controlled by a
PID (Proportional Integral Derivative) loop.
9 Unit control logic shall to manage frequency level of the compressor electric motor to exactly match plant load
request in order to keep constant the set point for delivered chilled water temperature. In this operating condition
unit control logic shall modulate electrical frequency level in a range lower and upper the nominal electrical network
value fixed at 50 Hz.
9 The microprocessor unit control shall detect conditions that approach protective limits and take self-corrective
action prior to an alarm occurring. The system shall automatically reduce chiller capacity when any of the following
parameters are outside their normal operating range:
o High condenser pressure
o Low evaporation refrigerant temperature
o High compressor motor amps
Evaporator
9 The units shall be supplied with shell and tubes counter-flow heat exchanger with single refrigerant pass. It will be
refrigerant direct expansion type with refrigerant inside the tubes and water outside (shell side). It will include
carbon steel tube sheets, with straight copper tubes internally wound for higher efficiencies, expanded on the tube
plates.
9
The evaporator will have 2 circuits, one for each compressor and shall be single refrigerant pass.
9 The water connections shall be VICTAULIC type connections as standard to ensure quick mechanical
disconnection between the unit and the hydronic network.
9 Evaporator is manufactured in accordance to PED approval.
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
Похожие устройства
- Daikin EWLD420I-SS Инструкция по эксплуатации панели управления
- Daikin EWLD420I-SS Инструкция по монтажу
- Daikin EWLD500I-SS Брошюра
- Daikin EWLD500I-SS Технические данные
- Daikin EWLD500I-SS Инструкция по эксплуатации панели управления
- Daikin EWLD500I-SS Инструкция по монтажу
- Daikin EWLD600I-SS Брошюра
- Daikin EWLD600I-SS Технические данные
- Daikin EWLD600I-SS Инструкция по монтажу
- Daikin EWLD600I-SS Инструкция по эксплуатации панели управления
- Daikin EWLD650I-SS Брошюра
- Daikin EWLD650I-SS Технические данные
- Daikin EWLD650I-SS Инструкция по эксплуатации панели управления
- Daikin EWLD650I-SS Инструкция по монтажу
- Daikin EWLD750I-SS Брошюра
- Daikin EWLD750I-SS Технические данные
- Daikin EWLD750I-SS Инструкция по эксплуатации панели управления
- Daikin EWLD750I-SS Инструкция по монтажу
- Daikin EWLD800I-SS Инструкция по монтажу
- Daikin EWLD800I-SS Технические данные