Hitachi Centrifugal Chillers

Transcription

1 Featuring Ozone-safe HCF134a Hitachi Centrifugal Chillers HC-F-GXG Higher-efficiency Type ARI temperature condition JIS temperature condition 1,463 kw to 4,571 kw (416 USRT to 1, USRT) 1,407 kw to 4,395 kw ( USRT to 1,50 USRT)

2 Hitachi GXG Series Centrifugal Chillers Show a Remarkable Energy-Saving Effect and Are Friendly High Energy-Saving Effect World's level of high efficiency [COP:5.6 to 6.3] Electricity consumption of the world is steadily increasing It is expected that the world s demand for primary energy will steadily increase with economic growth, and more importance has come to be given to energy saving in order to cut the 19% saving of energy ever-increasing consumption of electricity. High-efficiency GXG Series Centrifugal Chillers that use HFC134a are excellent products developed by Hitachi, fully utilizing its advanced technologies and rich experience. They are active throughout the world due to their high reputation and excellent performance. By minimizing the flow loss of HFC134a refrigerant, thoroughly re-examining the power loss of rotor and motor, and employing a -stage economizer cycle, Hitachi succeeded in greatly increasing efficiency. Electric power consumption 100% 81% Conventional single-stage models GXG series Energy saving GXG Series Global warming prevention Ozone layer protection Comparison with RT HFC134a Centrifugal Chiller * Calculation condition COP of single-stage model: 4.90 COP of GXG series: 6.08 (JIS temperature condition) Structure of Model Name Large temperature differential chilled water system Symbol for chiller type Standard cooling capacity of compressor (RT) CFC's substitute adapted type (HFC134a used) Series code for chiller 1

3 to the Global Environment Global Warming Prevention Energy saving by higher-efficiency centrifugal chillers Average temperature of the earth is still going up Global warming refers to the phenomenon of global rising in average atmospheric temperatures due to increased volume of CO and methane as a result of burning fossil fuels such as petroleum and coal. The 1995 IPCC* Report predicted that if the emission of CO, etc. continued as it was, the atmospheric temperature would rise by as high as C by the end of the 1st century and, as a result, the sea level would rise by approximately 50 cm from the present level. In such circumstances, it is more strongly required to save the energy consumed by air conditioners in order to cut CO emission. * IPCC: Intergovernmental Panel on Climate Change Ozone layer Protection Use of HFC134a refrigerant has an ozone depletion potential of zero Depletion of the ozone layer in the stratosphere proves a serious menace to the existence of terrestrial life Chlorofluorocarbons (CFCs) diffusing in the stratosphere are exposed to ultraviolet rays to be decomposed, separating chlorine atoms. It is said that separated chlorine atoms combine with oxygen atoms in ozone to destroy the ozone. Because HFC134a has no chlorine atoms, it does not destroy the ozone in the atmosphere. Sun Ordinary ultraviolet rays Harmful ultraviolet rays Ozone layer The ozone layer cuts harmful ultraviolet rays Chlorofluorocarbons destroy the ozone layer to generate ozone holes Ozone layer destruction (ozone hole) Surface of earth Chlorofluorocarbons, etc. Ozone holes are expanded to increase harmful ultraviolet rays. Serious menace to the existence of terrestrial life Skin cancer, cataract and reduced harvests

4 Hitachi s High Technology and Rich Experience Realized By employing a three-dimensional blade impeller ( stages), economizer subcooling cycle and high-performance heat exchanger tubes, Hitachi succeeded in greatly increasing efficiency High-efficiency Compressor Increased compressor efficiency 3 dimensional blade impeller ( stages) Vaned diffuser Low specific speed compressor enables the use of low-loss bearing structure High-efficiency Refrigerating Cycle Increased refrigerating cycle efficiency Economizer cycle (intercooler) Subcooler Economizer cycle (Built in the condenser) To compressor nd stage suction Subcooling cycle (Built in the condenser) To evaporator To economizer Subcooling Condensation Condenser Absolute pressure Inter-cooling Expansion Effect of increased refrigerating cycle efficiency Economizer Evaporation Effect of single-stage cycle refrigeration Effect of two-stage cycle refrigeration Enthalpy Compression High-performance Heat Exchanger Increased efficiency resulted from improved performance of heat exchanger Employment of high-performance heat exchange tubes Optimal structural design of heat exchanger to match the behavior of refrigerant 3

5 High-Efficiency Chillers High-Efficiency Compressor High efficiency was achieved by employing precision cast three-dimensional blade impellers (two stages), vaned diffusers, and a low-loss bearing structure realized by lowering the specific speed of the compressor Three-dimensional blade impeller (two stages) The impeller with three-dimensional curved blades, which is low in internal flow loss, is employed to realize high efficiency in a wide operating range. The impeller is made of aluminum alloy with sufficient strength and manufactured by precision vacuum casting to give it ideal flow passages. Vaned diffuser For the diffuser, which is used to convert the velocity of refrigerant gas accelerated by the impeller into static pressure, vanes of small chord-pitch ratio and a high pressure recovery ratio were developed by computer design to realize high efficiency. The ideal diffuser shape, which is implemented by NC machines, realizes stable operation in a wide range from high to low load conditions. Cross-sectional view Plan view Low-loss bearing structure Due to the employed -stage compression system, the speed of the compressor can be lowered, which results in reducing bearing loss. High-Efficiency Refrigerating Cycle The economizer cycle and subcooling cycle are employed to increase the efficiency of the refrigerating cycle. -stage compression economizer and subcooling cycle With a vapor compression type chiller, the heat of evaporation that is generated when the state of the refrigerant changes from liquid to gas is used to cool chilled water in the evaporator. The lower the temperature of the liquid refrigerant that flows in the evaporator, the greater the heat of evaporation and the lower the quantity of circulated refrigerant. As a result, the power of the compressor is reduced and theoretical cycle efficiency increases. Economizer (intercooler) utilizes the self-cooling effect of refrigerant to lower the temperature of the refrigerant almost to the middle of condensing and evaporating 1st stage impeller nd stage impeller temperatures. The employment of the -stage compressor makes it possible to employ the economizer cycle and thus increase efficiency. By employing the subcooler (a compact cooler built into the Step-up gear lower part of the condenser) to cool the liquid refrigerant, Refrigerant from which is liquefied in the condenser, by means of cooling evaporator Refrigerant to condenser water, theoretical cycle efficiency is increased further. Refrigerant gas from economizer Reduced theoretical power High-Performance Heat Exchanger The high-performance heat exchanger tube is used. Evaporator and condenser The high-performance heat exchanger tube is used in the evaporator and the condenser, and the arrangement of tube banks is optimized as well to improve the performance of the heat exchanger. 4

6 Realized High Operability and Comfort, such as Wider Operating Range and Low Noise Wider Operating Range 100% Continuously operable without worry even on very hot days Motor input (%) 0 0 Lower limit of vane control with GXG series, approx. 0% Cooling water inlet temperature 3 C Cooling water inlet temperature 1 C Lower limit of vane control with conventional models Cooling capacity (%) 100% 1. This figure shows general characteristic for GXG series and slightly varies according to the model.. Cooling water temperature condition at part load conforms to JIS B861 centrifugal chiller and changes in proportion to cooling capacity. Cooling capacity (%) 100 Stable operation continues even when cooling water temperature rises in hot suer and condenser pressure rises due to proceeding tube fouling. Example of cooling water temperature rise due to increased external air temperature 50 Alarm Widened operating range Rated point Before stopping due to High Pressure Cut, an alarm signals to activate the overload prevention control function to continue operation. Cooling water inlet temperature ( C) Low-load operation is available throughout the year without special devices Conventionally the lower limit point for capacity control has been set mechanically, so that the capacity at the lower limit point increases in intermediate seasons or winter. With the GXG series, operation is stable up to 0% even at low cooling water temperatures, without any special devices (hot gas bypass valve, etc.), due to microcomputer control. Suer Winter Even in seasons where external air temperature is low, the expanded operating range of single unit chiller assures a high energy saving effect. While conventional models require a controlling cooling water inlet temperature of 0 C or higher, GXG series can operate up to a cooling water inlet temperature of 1 C, expanding further the capacity range. 1st unit 1st unit 100% nd unit Expanded operating range nd unit Due to the expanded operating range of the 1st chiller unit, energy saving can be achieved totally, including in the power of the nd chiller unit and accessories (chilled and cooling water pumps Low Noise Low noise is achieved, and also high-frequency noise that hurts the ears is cut. The fluid dynamic design of the compressor interior was optimized to achieve low noise. Because a -stage compressor is employed, speed is lowered and noise, especially high frequency noise, is cut remarkably. 5

7 High-Reliability and Minimized Maintenance Necessity Compressor Unit Key-free shaft coupling is used A friction force transmission system that is free from stress concentration further improves strength against low-cycle fatigue. Key system Impeller Key-free system Impeller Key spline Occurrence of stress concentration Power transmitting surface Key spline Coupling Hitachi's unique key-free coupling Motor Step-up gear nd stage impeller 1st stage impeller Accessories Purge is unnecessary Purging is unnecessary because internal pressure is higher than atmospheric pressure and no air leaks into the machine during operation. The loss of refrigerant is also reduced. Filter dryer thoroughly cuts residual water in the machine To remove especially the water contained in polyester oil and thus prevent lubricating oil from degrading, a filter dryer is installed as standard with sufficient margin. Fully automatic refrigerant cleaner is installed as standard This cleaner automatically recovers the oil mixed in the refrigerant and returns it to the oil tank while the chiller is running, reducing the frequency of adding oil externally. Fully equipped service valves Main valves are provided for filter dryers, oil strainers and pressure gauges and protective tubes are mounted on thermometers to make possible replacement by partial disassembly. The leakage of refrigerant is reduced. Condensing pressure Oiling pressure Evaporating pressure Outlet Inlet Cooling water Service valve Economizer Condenser Subcooler Compressor Motor M Filter dryer Filter dryer Outlet Evaporator Inlet Cooling water M Fully automatic refrigerant cleaner 6

8 Hitachi High-Efficiency Centrifugal Chillers Show Excellent A higher energy saving effect can be achieved when a large temperature differential chilled water system is Specifications ARI temperature condition Chilled water inlet temperature 1.3ºC, outlet temperature 6.7ºC, cooling water inlet temperature 9.4ºC, outlet temperature 34.7ºC Type [HC-F_GXG] FGXG FGXG F630GXG FGXG F1000GXG FGXG Cooling Capacity USRT ,040 1, kw 1,463 1,88,303,96 3,657 4,571 Flow Rate m 3 /h Chilled Water Pressure Drop Connection Pipe Nominal Size kpa DN Number of Passes 3 Flow Rate m 3 /h Cooling Water Pressure Drop Connection Pipe Nominal Size kpa DN Number of Passes Expected Motor Input kw Expected COP Length (A) 4,60 4,100 4,600 4,600 5, 5, Installation Dimensions Width (B) Height (C),00,350,00,350,650,600,650,600 3,350 3, 3,350 3, Length for Pulling Tubes 3, 3, Mass Operating in Mass Carrying in Mass ton ton Insulating Area m This table is applicable to chillers manufactured for normal water.. Capacity control range is 100 to approx. 0% 3. Fouling factor is assumed to be m C/W for both chilled and cooling water. Other foulingfactors may be met upon request. 4. Standard Main power sources: V AC, 50Hz, 3-phase HC-FGXG to FGXG 5. Capacities: HC-FGXG to FGXG: 4.5kVA 6. Maximum working pressure is 0.7 MPa for both chilled and cooling water. If higher maximum working pressures is required, please specify during inquiry. (It is possible to produce it up to 1.6MPa) 7. For water piping connections, see the dimensional outline drawing on page COP values do not include auxiliary power. 9. Specifications are subject to change without notice for technical improvement. 7

9 Energy Savings employed. Specifications JIS temperature condition Chilled water inlet temperature 1ºC, outlet temperature 7ºC, cooling water inlet temperature 3ºC, outlet temperature 37ºC Type [HC-F_GXG] FGXG FGXG F630GXG FGXG F1000GXG FGXG Cooling Capacity USRT 630 1,000 1,50 kw 1,407 1,758,15,813 3,516 4,395 Flow Rate m 3 /h Chilled Water Pressure Drop Connection Pipe Nominal Size kpa DN Number of passes 3 Flow Rate m 3 /h Cooling Water Pressure Drop Connection Pipe Nominal Size kpa DN Number of Passes Expected Motor Input kw Expected COP Length (A) 4,60 4,100 4,600 4,600 5, 5, Installation Dimensions Width (B) Height (C),00,350,00,350,650,600,650,600 3,350 3,350 3,350 3,350 Length for Pulling Tubes 3, 3, Mass Operating in Mass Carrying in Mass ton ton Insulating Area m This table is applicable to chillers manufactured for normal water.. Capacity control range is 100 to approx. 0% 3. Fouling factor is assumed to be m C/W for both chilled and cooling water. Other foulingfactors may be met upon request. 4. Standard Main power sources: V AC, 50Hz, 3-phase HC-FGXG to FGXG 5. Capacities: HC-FGXG to FGXG: 4.5kVA 6. Maximum working pressure is 0.7 MPa for both chilled and cooling water. If higher maximum working pressures is required, please specify during inquiry. (It is possible to produce it up to 1.6MPa) 7. For water piping connections, see the dimensional outline drawing on page COP values do not include auxiliary power. 9. Specifications are subject to change without notice for technical improvement. 8

10 Dimensional Outline Drawing (HC-FGXG to GXG) Condenser Safety valve for condenser Motor terminal box Evaporator Safety valve for evaporator Motor Compressor Control panel Cooling water inlet Chilled water inlet (for two-pass system) Chilled water outlet Cooling water outlet Height (C) c d a b Side B Length (A) for -pass system i Side A e f g Width (B) h This dimensional outline drawing shows a standard nozzle location. Please consult with our sales staff or distributor in case of 3-pass system. Positional Dimension of Water Piping (Unit: ) Type a b c Positional dimension of nozzle () d e f g h i HC-FGXG HC-FGXG HC-F630GXG HC-FGXG HC-F1000GXG HC-FGXG Scope of Standard Supply Item The following table shows a standard scope of supply and actual scope depends on contract. Please consult with our sales staff or distributor. Standard scope Main equipment Auxiliary equipment Coating Out of scope of supply Compressor, Main motor, Lubricant, Heat exchanger Safety device, Control panel, Starter, Accessories Chiller main unit: Anti-corrosive primer coating, Control panel/starter: Finish coat (color: Munsell 5Y7/1 semigloss) Foundation work, Carrying-in, Installation, Piping work, Cold insulation, Primary and secondary side electrical wiring, Coissioning for total system, Forced ventilation system, Outdoor discharge piping for safety valve, Companion flange, Bolt, Nut, Gasket, Foundation bolt, Refrigerant 9

11 Dimensional Outline Drawing (HC-FGXG to GXG) Foundation Drawing and Maintenance Dimensions (HC-FGXG to GXG) Safety valve for condenser Condenser Y-Y view Motor terminal box Foundation bolt (M4x) (out of scope) Chiller base 600 Rubber cushion Nut, washer, rubber bushing (out of scope) Base plate (out of scope) Motor L4 L L3 Y 40 Safety valve for evaporator Evaporator Y 105 Rubber cushion, location of base plate set Compressor Control panel 40 Cooling water outlet L1 Side A c a d b Chilled water outlet Height (C) Side B Chilled water inlet (for two-pass system) Drainage ditch or maintenance work 390 Cooling water inlet e Side A f g h Min. L5 i Length (A) for -pass system Min. L10 Side B Width (B) Min. L9 Min. L5 Min. L9 Maintenance space Positional Dimension of Water Piping b c d e f g h i HC-FGXG HC-FGXG HC-F630GXG HC-FGXG HC-F1000GXG HC-FGXG Item Main equipment The following table shows a standard scope of supply and actual scope depends on contract. Please consult with our sales staff or distributor. Standard scope Compressor, Main motor, Lubricant, Heat exchanger Auxiliary equipment Safety device, Control panel, Starter, Accessories Coating Chiller main unit: Anti-corrosive primer coating, Control panel/starter: Finish coat (color: Munsell 5Y7/1 semigloss) Out of scope of supply Foundation work, Carrying-in, Installation, Piping work, Cold insulation, Primary and secondary side electrical wiring, Coissioning for total system, Forced ventilation system, Outdoor discharge piping for safety valve, Companion flange, Bolt, Nut, Gasket, Foundation bolt, Refrigerant Maintenance space Min. L6 a Scope of Standard Supply 9 (Unit: ) Positional dimension of nozzle () Min. L7 Type Min. L4 This dimensional outline drawing shows a standard nozzle location. Please consult with our sales staff or distributor in case of 3-pass system. Space for pulling tubes To be provided on either A or B side Maintenance space L8 (Unit: ) Type Foundation dimensions Maintenance dimensions L1 L L3 L4 L5 L6 L7 L8 L9 L10 HC-FGXG 3, 1,30 1,710,70 3, 1,,000,000 HC-FGXG 3, 1,30 1,710,70 3, 1,,000,000 HC-F630GXG 3, 1,630,110,670 4, 1,600,, HC-FGXG 3, 1,630,110,670 4, 1,600,, HC-F1000GXG 3,760,,630 3,530 4, 1,600, 3, 1, 700 HC-FGXG 3,760,,630 3,530 4, 1,600, 3, 1,

12 Precautions for Equipment Design Machine room and safety devices (1) Avoid places that are near fire or burning substances (for example, care shall be taken regarding radiation heat when installed together with a heating element such as boiler) () Select a well ventilated place where room temperature is 40 C or less and humidity is low. (Be careful as high temperatures may cause electrical fault and early corrosion of equipment. Allowable ambient humidity: max. 95%RH at 40C) (3) Select a low-dust area. (Dust may cause electrical fault.) (4) Select a place that is convenient for inspection and maintenance, paying attention to lighting.) (5) Keep sufficient space for maintenance, including spaces for pulling tubes, disassembling the water chamber, and maintenance and repair. (6) To facilitate the lifting up/down of equipment, provide lifting hooks on the ceiling or keep a sufficient room height for setting a lifting pole. (7) Provide sufficient drainage. (8) Avoid direct sunlight. (9) Prepare city water source and receptacles for maintenance work. (10) Keep sufficient maintenance space at the entrance for carrying equipment out. Water piping and ventilation works (1) Chilled and cooling water piping shall be supported by pipe supports and carefully laid so that no strong force will act on the evaporator or the condenser. () Be sure to install a 10-mesh strainer on the inlet piping of chilled and cooling water. (3) Chilled and cooling water piping shall be planned such that their flow is controlled on the chiller outlet side. (4) The water storage capacity of each type is as follows: Type HC-FGXG HC-FGXG HC-F630GXG Chilled water (evaporator) Cooling water (condenser) Total Type HC-FGXG HC-F1000GXG HC-FGXG Chilled water (evaporator) Cooling water (condenser) (5) Keep a sufficient ventilating flow rate. (6) The system shall be planned so that transient pressure pulsation, which causes the water suspension relay to malfunction, won't occur Total (Unit: m 3 ) Water Quality Control Because strain or corrosion on evaporator or condenser tubes of the centrifugal chiller depends on the quality of water used, sufficient control is recoended regarding the quality of circulating water that is used as chilled or cooling water. Maintenance Maintenance, other than daily operation and regular maintenance, requires expertise. Please contact Hitachi when necessary. Improper maintenance might cause machine fault, oxygen deficiency accidents, fire, electric shock or other problems. Safety Precautions Regarding use Carefully read the instruction manual before use and correctly operate the equipment. Regarding installation (1) Avoid installing the unit in places where inflaable material (gasoline, thinner, etc.) is handled or where corrosive gas (aonia, chlorine, etc.) is generated. Otherwise, fire may result. () Carrying-in work, installation work, foundation work, electrical work, various piping work, various interlock work and hot/cold insulation work are necessary. Improper work might cause overturn, electric shock, water leakage, refrigerant leakage, fuel leakage, oxygen deficiency accidents, burns or other problems. (3) Refrigerant outdoor discharge piping work and suction and exhaust piping work are necessary. Improper work might cause oxygen deficiency accidents or other problems. (4) Waterproofing is necessary on the floor surface of the place where the chiller unit is installed, as well as a drainage ditch around the installation place. Improper waterproofing might cause water leakage, resulting in water damage to surrounding facilities in the worst case. (5) Sufficient space for maintenance work must be kept around the unit. Insufficient space might obstruct safe operation and cause injury. Distributed by Printed in Japan (H) MR-E060P 0709