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ETI SERIES

 

The use of inverters in heat source equipment has expanded significantly since the release of the eco Turbo ETI Series of centrifugal chillers, which are equipped with inverters (as standard equipment) for energy savings and user-friendliness.

Introduction In response to increasing social concerns for energy savings and reduction of CO 2 emissions, high-performance centrifugal chillers are currently being widely used in industrial facilities (such as heat source systems) as well as for resident ial air conditioning systems. Although centrifugal chillers are highly efficient heat pump machines, their energy consumption is greater because o f their high capacity. Thus, the development of technologies and products focusing on performance enhancement is essential in terms of reduction of CO 2 emissions. In addition, because centrifugal chillers are now widely used in many heat source systems, simplicity of installation and user-friendliness have become important customer needs. This paper provides a background on the current trends and customer needs in heat source equipment and describes the evolution and characteristics of the eco Turbo ETI Series of centrifugal chillers, which are equipped with inverters (as standard equipment) and first released in May 2008. 1

Further Performance Enhancements For the ETI series of centrifugal chillers, technical factors for performance enhancement have been proven in the field of large, high-performance centrifugal chillers, and downsizing and performance enhancement have both been accomplished through review and refinement of these technical factors. We have expanded the ETI series and achieved further performance enhancements. The technologies required for these performance enhancements are described below

img-aart-series

 

AART SERIES

 

New Model Turbo Chiller, AART Series, Contributes to the Reduction of Energy Consumption under Year- Round Operation

The use of inverters in heat source equipment has expanded significantly since the release of the eco Turbo ETI Series of centrifugal chillers, which are equipped with inverters (as standard equipment) for energy savings and user-friendliness. In particular, application of inverters contributes to energy savings in heat source systems subjected to widely varying operating conditions such as cooling water temperature and load factor. Mitsubishi Heavy Industries, Ltd. (MHI) is expanding the eco Turbo ETI Series in order to reduce the environmental burden of these units. This paper explains the possibility of further series expansion in terms of characteristics, energy saving effects, and the usefulness of performance enhancements and functional improvements, as well as technologies for reducing the environmental burden, including the adoption of new refrigerants.

Introduction In response to increasing social concerns for energy savings and reduction of CO2 emissions, high-performance centrifugal chillers are currently being widely used in industrial facilities (such as heat source systems) as well as for residential air conditioning systems. Although centrifugal chillers are highly efficient heat pump machines, their energy consumption is greater because of their high capacity. Thus, the development of technologies and products focusing on performance enhancement is essential in terms of reduction of CO2 emissions. In addition, because centrifugal chillers are now widely used in many heat source systems, simplicity of installation and user-friendliness have become important customer needs. This paper provides a background on the current trends and customer needs in heat source equipment and describes the evolution and characteristics of the eco Turbo ETI Series of centrifugal chillers, which are equipped with inverters (as standard equipment) and were first released in May 2008.1

Further Performance Enhancements For the ETI series of centrifugal chillers, all technical factors for performance enhancement have been proven in the field of large, high-performance centrifugal chillers, and downsizing and performance enhancement have both been accomplished through review and refinement of these technical factors. We have expanded the ETI series and achieved further performance enhancements. The technologies required for these performance enhancements are described below.

img-aart-series-1

 

AART – I SERIES

 

The latest AART and AART-I series of centrifugal chillers are characterized by high performance with good load and cooling water follow-up performance.

The latest AART and AART-I series of centrifugal chillers are characterized by high performance with good load and cooling water follow-up performance. Their energy-saving characteristics are due not only to the equipment’s basic performance, but also to the dedicated microcomputer control panel with ample computing power. Their high level of flexibility, which includes the optimized control of six adjustable elements applicable to any set of conditions using numerical arithmetic control, satisfies user requirements that have previously not been met. We included an ultralow load area of almost 0% into the controllable range, thus making it possible for the centrifugal chillers to deal with chilled water temperature regulation in a continued ultralow load area or for load startup from an ultralow load area. In addition, the centrifugal chillers detect instantaneous voltage drops in a half cycle, making automatic recovery possible while maintaining self-sustaining operational signals. Furthermore, by making maximum use of high visibility liquid-crystal display panels and extended data communications functions, the centrifugal chillers have simplified user support functions, such as daily monitoring and maintenance, and performance evaluation after installation.

Introduction : Mitsubishi Heavy Industries, Ltd. (MHI) has been producing centrifugal chillers for more than 40 years, and developing them with continuous performance enhancement as a top priority after 2000. Improvement of the coefficient of performance (COP) at the rated point has been the focus in the past. Over the past two to three years, however, development has concentrated on the challenge of reducing energy consumption and improving the annual energy efficiency under actual operating conditions. Of the centrifugal chillers used in Japan, 60% to 70% are for industrial applications, such as semiconductor factories, while the remainder are for consumer applications, such as building air conditioning. These applications are very diverse, including heat source systems for clean rooms in semiconductor manufacturing and large scale thin panel display factories, heat sources for district heating and cooling, medium- to large-scale shopping centers, car painting facilities, chemical manufacturing, large-scale building air conditioning, and process cooling in chemical plants. It is extremely important to make products capable of meeting these diverse user needs. In addition, other common requirements have recently become prominent, including the need to reduce CO2 emissions, save energy, reduce operating costs, and achieve stable operating characteristics. Therefore, the essential product characteristics have now become clear. Here, we report careful control and greater functionality in tune with actual operating conditions as technology to meet user needs.

Basic control of centrifugal chillers : About 90% of the energy used in a centrifugal chiller is consumed by the compressor as it compresses the refrigerant gas. The remaining 10% is lost through electromagnetic and mechanical losses in the electric motor and windage loss due to gas stirring. As a centrifugal chiller is designed for optimum operation at the rated point, the loss in the refrigeration cycle is minimal at that point. However, as the chilled water temperature, cooling water temperature, and cooling capacity move away from the rated point, the losses increase and the performance is degraded unless properly controlled. Therefore, control is very important.
(1) Optimal control
In the latest AART series and AART-I series of chillers, optimization is possible through the six controllable elements outlined below, even when operation is not close to the specification point
• First-stage inlet vanes: These are aerodynamically variable blades located directly in front of the impeller to perform a capacity control function.
• Second-stage inlet vanes: These complement the first-stage inlet vane, making it possible to improve the controllability.
• Variable speed control: This controls the rotary speed of the compressor making it possible to control the pressure of the exhaust gas and air volume during suction. This is achieved by controlling the frequency of the power supplied to the electric motor (AART-I series only).

product-dummy

 

GART SERIES

 

The GART series of large capacity centrifugal chillers achieves both high efficiency and a smaller size in response to the requests of customers.

*1. Division Machinery, Equipment & Infrastructure
*2 Chiller & Heat Pump Engineering Department, Air-Conditioning & Refrigeration Division, Machinery, Equipment & Infrastructure
*3 Chief Staff Manager, Takasago Research & Development Center, Technology & Innovation Headquarters

“GART Series” Large Capacity Centrifugal Chillers Achieved High Efficiency, Downsizing : Recently, domestic demand in terms of both total capacity and number of shipments of centrifugal chillers has been declining because of factors such as the trend of customers shifting production facilities to overseas locations. Therefore, to motivate customers to select the centrifugal chillers of Mitsubishi Heavy Industries Ltd. (MHI), products with functions and specifications that satisfy customer requests for heat source equipment, including demands for a reduction of electricity consumption and saving of installation volume space, are needed. The GART series of large capacity centrifugal chillers achieves both high efficiency and a smaller size in response to the requests of customers. By not only improving the performance and compactness of its components such as the compressor and the heat exchanger, but also by using the space effectively, the layout of the GART series has been optimized so that the space volume ratio is enhanced. As a result, a rated COP (Coefficient Of Performance) of 6.5, a 6% increase of IPLV (Integrated Part Load Value) compared with existing models and a 40% reduction of the space volume of the machine compared with existing models have been attained.

Introduction : Although demand for centrifugal chillers has been growing overseas mainly in emerging countries, domestic demand has been declining since its peak in 2007. Domestic demand for centrifugal chillers in 2012 in terms of total capacity as well as number of shipments has decreased to half. This is because of a reduction in the construction of new domestic heat source facilities due to factors such as the trend of customers shifting production facilities to overseas locations since the Lehman crisis in 2008. Because of this background, when customers renovate existing heat source facilities or build new models, they require efficient planning and operation of heat source equipment and request higher functionality for the centrifugal chiller to be used. The main role of a centrifugal chiller is to create chilled water for cooling, but the creation of the necessary quantity of chilled water is a matter of course. What is important when a customer selects a centrifugal chiller is the characteristics of the product, including its capabilities to reduce electricity consumption in operation and the saving of necessary installation space. Therefore chillers with high efficiency that can reduce electricity consumption and compactness that enables space-saving will be selected by customers.This paper presents the GART series of large-capacity centrifugal chillers that attain both high efficiency and compactness to address those requests of customers.

Background of development of GART series : Since 2000, the high-capacity centrifugal chillers that MHI produces have specialized in products that use R134a, an ozone-friendly refrigerant. In 2000, MHI brought the NART series of high-performance models to the market. Since then, MHI has released the AART series with the Mitsubishi Heavy Industries Technical Review Vol. 51 No. 2 (June 2014) 27 industry’s highest level of rated COP of 6.4 in 2003, and chiller models that attain high efficiency in the entire practical operating range including partial load operation due to the employment of an inverter and the improvement of the control mechanism in 2006. The improvement of COP has a direct effect on the economic aspect of the operation of the heat source facilities of customers, and also contributes to environmental conservation through benefits such as a reduction of CO2 emissions. MHI has been researching performance enhancements and the optimum control of the compressor and heat exchanger in order to improve the performance of centrifugal chillers. However, the insatiable pursuit of performance improvement without being content with the current situation is still required. On the other hand, the layout design has not been changed significantly since the launch of the NART series, and the space volume, which is the product of the overall length, width and height of the machine, has remained unchanged since then. The reduction of the space volume of a chiller enables the improvement of refrigerating capability without extending the machine room. In addition, in the case of replacements where the space volume of the machine room is limited, a machine with larger dimensions cannot be installed even if it has higher efficiency. Reduction of the space volume of a centrifugal chiller enhances the flexibility of the customer’s facility plan and enables the selection of the model that suits their needs. Accordingly, just providing high efficiency or compactness cannot meet the needs of customers, and only a chiller offering both will be selected. MHI has developed the GART series under the concept of the simultaneous pursuit of high efficiency and compactness, while aiming to improve COP from 6.4 to 6.5, reduce space volume by up to 30% and attain the smallest size in the market.

+ ETI SERIES

product

 

ETI SERIES

 

The use of inverters in heat source equipment has expanded significantly since the release of the eco Turbo ETI Series of centrifugal chillers, which are equipped with inverters (as standard equipment) for energy savings and user-friendliness.

Introduction In response to increasing social concerns for energy savings and reduction of CO 2 emissions, high-performance centrifugal chillers are currently being widely used in industrial facilities (such as heat source systems) as well as for resident ial air conditioning systems. Although centrifugal chillers are highly efficient heat pump machines, their energy consumption is greater because o f their high capacity. Thus, the development of technologies and products focusing on performance enhancement is essential in terms of reduction of CO 2 emissions. In addition, because centrifugal chillers are now widely used in many heat source systems, simplicity of installation and user-friendliness have become important customer needs. This paper provides a background on the current trends and customer needs in heat source equipment and describes the evolution and characteristics of the eco Turbo ETI Series of centrifugal chillers, which are equipped with inverters (as standard equipment) and first released in May 2008. 1

Further Performance Enhancements For the ETI series of centrifugal chillers, technical factors for performance enhancement have been proven in the field of large, high-performance centrifugal chillers, and downsizing and performance enhancement have both been accomplished through review and refinement of these technical factors. We have expanded the ETI series and achieved further performance enhancements. The technologies required for these performance enhancements are described below

+ AART SERIES

img-aart-series

 

AART SERIES

 

New Model Turbo Chiller, AART Series, Contributes to the Reduction of Energy Consumption under Year- Round Operation

The use of inverters in heat source equipment has expanded significantly since the release of the eco Turbo ETI Series of centrifugal chillers, which are equipped with inverters (as standard equipment) for energy savings and user-friendliness. In particular, application of inverters contributes to energy savings in heat source systems subjected to widely varying operating conditions such as cooling water temperature and load factor. Mitsubishi Heavy Industries, Ltd. (MHI) is expanding the eco Turbo ETI Series in order to reduce the environmental burden of these units. This paper explains the possibility of further series expansion in terms of characteristics, energy saving effects, and the usefulness of performance enhancements and functional improvements, as well as technologies for reducing the environmental burden, including the adoption of new refrigerants.

Introduction In response to increasing social concerns for energy savings and reduction of CO2 emissions, high-performance centrifugal chillers are currently being widely used in industrial facilities (such as heat source systems) as well as for residential air conditioning systems. Although centrifugal chillers are highly efficient heat pump machines, their energy consumption is greater because of their high capacity. Thus, the development of technologies and products focusing on performance enhancement is essential in terms of reduction of CO2 emissions. In addition, because centrifugal chillers are now widely used in many heat source systems, simplicity of installation and user-friendliness have become important customer needs. This paper provides a background on the current trends and customer needs in heat source equipment and describes the evolution and characteristics of the eco Turbo ETI Series of centrifugal chillers, which are equipped with inverters (as standard equipment) and were first released in May 2008.1

Further Performance Enhancements For the ETI series of centrifugal chillers, all technical factors for performance enhancement have been proven in the field of large, high-performance centrifugal chillers, and downsizing and performance enhancement have both been accomplished through review and refinement of these technical factors. We have expanded the ETI series and achieved further performance enhancements. The technologies required for these performance enhancements are described below.

+ AART - I SERIES

img-aart-series-1

 

AART – I SERIES

 

The latest AART and AART-I series of centrifugal chillers are characterized by high performance with good load and cooling water follow-up performance.

The latest AART and AART-I series of centrifugal chillers are characterized by high performance with good load and cooling water follow-up performance. Their energy-saving characteristics are due not only to the equipment’s basic performance, but also to the dedicated microcomputer control panel with ample computing power. Their high level of flexibility, which includes the optimized control of six adjustable elements applicable to any set of conditions using numerical arithmetic control, satisfies user requirements that have previously not been met. We included an ultralow load area of almost 0% into the controllable range, thus making it possible for the centrifugal chillers to deal with chilled water temperature regulation in a continued ultralow load area or for load startup from an ultralow load area. In addition, the centrifugal chillers detect instantaneous voltage drops in a half cycle, making automatic recovery possible while maintaining self-sustaining operational signals. Furthermore, by making maximum use of high visibility liquid-crystal display panels and extended data communications functions, the centrifugal chillers have simplified user support functions, such as daily monitoring and maintenance, and performance evaluation after installation.

Introduction : Mitsubishi Heavy Industries, Ltd. (MHI) has been producing centrifugal chillers for more than 40 years, and developing them with continuous performance enhancement as a top priority after 2000. Improvement of the coefficient of performance (COP) at the rated point has been the focus in the past. Over the past two to three years, however, development has concentrated on the challenge of reducing energy consumption and improving the annual energy efficiency under actual operating conditions. Of the centrifugal chillers used in Japan, 60% to 70% are for industrial applications, such as semiconductor factories, while the remainder are for consumer applications, such as building air conditioning. These applications are very diverse, including heat source systems for clean rooms in semiconductor manufacturing and large scale thin panel display factories, heat sources for district heating and cooling, medium- to large-scale shopping centers, car painting facilities, chemical manufacturing, large-scale building air conditioning, and process cooling in chemical plants. It is extremely important to make products capable of meeting these diverse user needs. In addition, other common requirements have recently become prominent, including the need to reduce CO2 emissions, save energy, reduce operating costs, and achieve stable operating characteristics. Therefore, the essential product characteristics have now become clear. Here, we report careful control and greater functionality in tune with actual operating conditions as technology to meet user needs.

Basic control of centrifugal chillers : About 90% of the energy used in a centrifugal chiller is consumed by the compressor as it compresses the refrigerant gas. The remaining 10% is lost through electromagnetic and mechanical losses in the electric motor and windage loss due to gas stirring. As a centrifugal chiller is designed for optimum operation at the rated point, the loss in the refrigeration cycle is minimal at that point. However, as the chilled water temperature, cooling water temperature, and cooling capacity move away from the rated point, the losses increase and the performance is degraded unless properly controlled. Therefore, control is very important.
(1) Optimal control
In the latest AART series and AART-I series of chillers, optimization is possible through the six controllable elements outlined below, even when operation is not close to the specification point
• First-stage inlet vanes: These are aerodynamically variable blades located directly in front of the impeller to perform a capacity control function.
• Second-stage inlet vanes: These complement the first-stage inlet vane, making it possible to improve the controllability.
• Variable speed control: This controls the rotary speed of the compressor making it possible to control the pressure of the exhaust gas and air volume during suction. This is achieved by controlling the frequency of the power supplied to the electric motor (AART-I series only).

+ GART SERIES

product-dummy

 

GART SERIES

 

The GART series of large capacity centrifugal chillers achieves both high efficiency and a smaller size in response to the requests of customers.

*1. Division Machinery, Equipment & Infrastructure
*2 Chiller & Heat Pump Engineering Department, Air-Conditioning & Refrigeration Division, Machinery, Equipment & Infrastructure
*3 Chief Staff Manager, Takasago Research & Development Center, Technology & Innovation Headquarters

“GART Series” Large Capacity Centrifugal Chillers Achieved High Efficiency, Downsizing : Recently, domestic demand in terms of both total capacity and number of shipments of centrifugal chillers has been declining because of factors such as the trend of customers shifting production facilities to overseas locations. Therefore, to motivate customers to select the centrifugal chillers of Mitsubishi Heavy Industries Ltd. (MHI), products with functions and specifications that satisfy customer requests for heat source equipment, including demands for a reduction of electricity consumption and saving of installation volume space, are needed. The GART series of large capacity centrifugal chillers achieves both high efficiency and a smaller size in response to the requests of customers. By not only improving the performance and compactness of its components such as the compressor and the heat exchanger, but also by using the space effectively, the layout of the GART series has been optimized so that the space volume ratio is enhanced. As a result, a rated COP (Coefficient Of Performance) of 6.5, a 6% increase of IPLV (Integrated Part Load Value) compared with existing models and a 40% reduction of the space volume of the machine compared with existing models have been attained.

Introduction : Although demand for centrifugal chillers has been growing overseas mainly in emerging countries, domestic demand has been declining since its peak in 2007. Domestic demand for centrifugal chillers in 2012 in terms of total capacity as well as number of shipments has decreased to half. This is because of a reduction in the construction of new domestic heat source facilities due to factors such as the trend of customers shifting production facilities to overseas locations since the Lehman crisis in 2008. Because of this background, when customers renovate existing heat source facilities or build new models, they require efficient planning and operation of heat source equipment and request higher functionality for the centrifugal chiller to be used. The main role of a centrifugal chiller is to create chilled water for cooling, but the creation of the necessary quantity of chilled water is a matter of course. What is important when a customer selects a centrifugal chiller is the characteristics of the product, including its capabilities to reduce electricity consumption in operation and the saving of necessary installation space. Therefore chillers with high efficiency that can reduce electricity consumption and compactness that enables space-saving will be selected by customers.This paper presents the GART series of large-capacity centrifugal chillers that attain both high efficiency and compactness to address those requests of customers.

Background of development of GART series : Since 2000, the high-capacity centrifugal chillers that MHI produces have specialized in products that use R134a, an ozone-friendly refrigerant. In 2000, MHI brought the NART series of high-performance models to the market. Since then, MHI has released the AART series with the Mitsubishi Heavy Industries Technical Review Vol. 51 No. 2 (June 2014) 27 industry’s highest level of rated COP of 6.4 in 2003, and chiller models that attain high efficiency in the entire practical operating range including partial load operation due to the employment of an inverter and the improvement of the control mechanism in 2006. The improvement of COP has a direct effect on the economic aspect of the operation of the heat source facilities of customers, and also contributes to environmental conservation through benefits such as a reduction of CO2 emissions. MHI has been researching performance enhancements and the optimum control of the compressor and heat exchanger in order to improve the performance of centrifugal chillers. However, the insatiable pursuit of performance improvement without being content with the current situation is still required. On the other hand, the layout design has not been changed significantly since the launch of the NART series, and the space volume, which is the product of the overall length, width and height of the machine, has remained unchanged since then. The reduction of the space volume of a chiller enables the improvement of refrigerating capability without extending the machine room. In addition, in the case of replacements where the space volume of the machine room is limited, a machine with larger dimensions cannot be installed even if it has higher efficiency. Reduction of the space volume of a centrifugal chiller enhances the flexibility of the customer’s facility plan and enables the selection of the model that suits their needs. Accordingly, just providing high efficiency or compactness cannot meet the needs of customers, and only a chiller offering both will be selected. MHI has developed the GART series under the concept of the simultaneous pursuit of high efficiency and compactness, while aiming to improve COP from 6.4 to 6.5, reduce space volume by up to 30% and attain the smallest size in the market.

CONTACT US

ASECO CHILLERS TECHNOLOGY

 

P.O. Box 30303, Dubai, United Arab Emirates
Al Sayegh Building, 1st Floor, Oud Metha,

Tel: +971 4 3375237

Fax: +971 4 3357703

E-mail: info@asecoct.ae

Web: www.aseco.ae