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ECONO-PILOT”ENERGY-SAVING SYSTEM FOR WATER PUMPSWe have developed the “Econo-Pilot” energy-saving system for water pumps, which reduces the power consumption of motors for water supply. In the energy-saving control field, the conventional method used is that of constant pressure control of the water supply with inverters. However, as Econo-Pilot employs a method of variable water pressure control corresponding to flow volume, the system can raise the energy-saving ratio up to 90 percent. This paper describes the principles of the system and its basic functions, along with a case study of some practical applications.INTRODUCTIONWith the background of fulfilling public commitments for the prevention of global warning, many countries have consolidated related laws and regulations aiming to reduce energy consumption. Energy conservation has become one of the important issues for companies and organizations accredited with the ISO 14000 series standards certification because they are required to achieve yearly targets for improvements, which have, in a sense, the same implications as laws. In a prolonged recession, investments in energy-saving activities directly linked with cost reduction have attracted increasing attention.However, large-scale renewal investments which entail enormous costs cannot be implemented easily. Consequently, there have been increasing needs for energy conservation activities which bring about substantial cost reduction effects but can be conducted inexpensively with ease and minimum risks, while at the same time utilizing existing facilities.Figure 1 is a graphical indication of the energy consumption ratios of office buildings, which is based on research conducted by the Building-Energy Managers Association of Japan. As indicated in the graph, air conditioning-related items account for half of the total consumption. This means that air conditioning must be the main target for energy conservation.Figure 1 Energy Consumption of Office Buildings by UsageAmong air conditioning-related technologies, we have focused on the control of air conditioning pumps and have developed a new energy-saving control system called Econo-Pilot which meets the requirements for implementations mentioned earlier system.The Econo-Pilot adopts a new control mechanism contrived by three enterprises-Yokogawa Electric Corporation, Asahi Kogyosha Co, Ltd., and The First Energy Service Company, Limited-and was commercialized by Yokogawa after the development and demonstration phases, through joint research with the New Energy and Industrial Technical Development Organization (NEDO).OVERVIEW OF AN AIR CONDITIONING SYSTEMFigure 2 shows an overview of an air conditioning system. Broadly speaking, energy is consumed by heat sources, water pumps, and ventilators.FIgure 2 Overview of an Air Conditioning System A heat source generates cold/hot water through gas combustion in the case of applying a gas-based cold/hot water generator, the cold/hot water is then conveyed to air conditioners by water pumps. Inside air conditioner, the cold/hot water is flowing through heat exchange equipment where air is warned up or cooled when passing through the heat exchange equipment via ventilators- and then the warned/cooled air is blown to an area through ducts.Water pumps are mainly classified into primary pumps, secondary pumps, an