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Ebara Engineering Review No.225

Trends in the Energy-saving of Pumps


Reducing energy consumption is a crucial factor for the prevention of global warming. Studies are underway in Japan, as well as in many other countries, on measures for achieving such reduction. Energy saving is beneficial for modern civilization and serves as an effective deterrent against a return to primitiveness.
EU's progressive attempts in reducing the energy consumption of pumps are yielding favorable results. The energy consumption of pumps in Japan is a factor that can not be neglected. Measures must be worked out and implemented accordingly. The following discusses that optimal pump design, including the machining on the outer diameter of impellers and controlling the pump rotational speed, is an effective means for achieving energy saving.

Pump, Energy saving, Rotational speed control, Energy labeling scheme, Climate change, Eup directive, Ecodesign, Inverter, Efficiency, Head

Energy Saving in Water Supply Pumping Facilities

by Kazuhiro NAGAOKA

Energy saving at potable water supply facilities has been attempted by improving pump operation control. Improving the overall water distribution system, not just mechanical efficiencies, is a crucial factor in achieving energy saving when carrying out large-scale renovation to upgrade aging water supply systems. The following exemplifies one such case.

Energy saving technology, Operation control, Water supply system, Distribution pump

Transition in Energy-saving Technologies of Booster Units

by Masahito KAWAI

A study was made on the energy consumption of various booster units for high-rise buildings and housing complexes. Results indicated that using direct connecting booster pump systems, estimated constant end-pressure control, and PMSMs (Permanent Magnet Synchronous Motors) enabled about 70% reduction in power consumption, compared to the case of using current conventional means. However, booster systems are operated under significantly smaller than rated flow rates most of the time. Thus, it is possible to conserve power by employing a train of multiple small-rated pumps and controlling their OFF/ON in an optimal way. The relationship among the specifications of the structure housing the booster system, instant maximum water consumption, and water consumption patterns needs to be clarified to determine the type and number of pumps which would enable optimization.

Direct connecting booster pump system, Estimated constant end-pressure control, Permanent magnet synchronous motor (PMSM), Instant maximum water consumption, Water consumption pattern

Simulation of Axial Flow Pump Startup Torque Characteristics by Fluid Transient Analysis Program (TRAP Ⅲ)

by Shigeo TAKITA, Kazutoshi ARAI, Fuminori ETO, & Kenichi UMEMURA

The torque characteristics during an axial flow pump startup, focusing on the operating point transition of a not fully water-filled startup, were studied. Comparison was made among numerical results of model case analysis, actual in-site data, and analytical data. TRAP Ⅲ, a fluid transient analysis program developed by Ebara,was used for the simulation. The effectiveness of this program was confirmed and the use of this method of evaluating the torque characteristics of axial flow pumps is looked forward to.

Axial flow pump, Startup torque, one-dimensional unsteady flow analysis, Not fully water-filled startup pipe, Siphon, Inertial effect coefficient, Complete characteristics, Static friction torque, Adding mass of water, Locus of operating point

Performance of Next-generation Stoker Type Incinerator System

by Mitsutoshi YAMAMOTO, Tetsuji IGUCHI, Minoru SASAKI, Takehiro OKA, Motoshi ARIHARA, & Masamitsu KOSHIMA

The performance of a leading-edge stoker type incinerator system, currently in operation at a municipal waste incineration plant, has been assessed. This system follows a DBO (Design-Build-Operate) plan in an effort to realize cost-effectiveness and superior servicing. A next-generation stoker, featuring exhaust gas recirculation and a forced, air-cooled grate, constitutes the core of this system. The exhaust gas recirculation enables low excess air ratio operation, reduced exhaust gas emission, and improved heat recovery. Moreover, the NOx reduction effect by this system enables selective non-catalytic reduction, thus making catalytic denitrification unnecessary. Assessment results confirmed stable operation of this system.

Next generation stoker technology, Exhaust gas recirculation, Forced air cooled type grate, Low excess air ratio, NOx reduction, Design build operate method, Dioxins, Selective non-catalytic reduction, Arakawa Clean Center, Incineration plant

EMC Test System

by Nobuhiro HIGAKI, Masahito KAWAI, & Hirofumi NAKANIWA

An EMC (ElecroMagnetic Compatible) system has been newly employed to test large-output pumps and water supply systems operated under actual load conditions. The shielded room of this system features a design which fully considers the use of water. It includes a pump operation facility whose features and capabilities are unprecedented in other such test systems. and whose interior has enough space to allow testing of large-scale machinery. Moreover, the system's power source facility and EMC test apparatus make it possible for conducting EMC tests on high-current capacity equipment and pump products for export.

EMC, EMC test, Shielded room, Immunity, Emission, Ground plane, Main terminal interface voltage, Electrostatic discharge immunity test, Electrical fast transient/burst immunity test, Surge immunity test

Development of Atmospheric Pressure Type Turbomolecular Pump

by Hiroyuki KAWASAKI, & Hiroaki OGAMINO

A novel atmospheric pressure type turbomolecular pump has been developed for the microchip/IC manufacturing industry, as well as for SEM applications. This pump makes it unnecessary to use backup by auxiliary pumps, needed for creating an ultra-high vacuum environment by conventional turbomolecular pump operation. This new pump is fully oil-free, compact and featuring exceptionally high compression performance. Development was centered on the minimization of vane clearance by introducing thin ceramic multi-stage centrifugal vanes, as well as optimal dynamic and sensor-less magnetic bearings.

Atmospheric pressure type TMP, Ceramics centrifugal vane, Dynamic bearing, Backup pump, Sensor less magnetic bearing, Thrust force, Ultra high vacuum, Destructive torque