AN OPTIMIZED CONTROL METHOD FOR SECONDARY PUMPS IN HVAC SYSTEMS
The energy consumption of pumps makes up a large proportion of the total energy consumption in HVAC systems. Recently, the reduction of energy consumption has been accomplished by controlling the rotation speed of motors of secondary pumps. The rotation speed of motors is usually controlled by the pressure in the pipes. A popular method by which to achieve this control is to maintain constant the supply water pressure at the outlet of the pumps so as to ensure the flow rates for air conditioners. However, the energy savings is small for this method because the pressure must be maintained too high in the case of a low flow rate, which occurs at a low heat load. In the present study, a method to control motors assuming a relationship between the resistance of the pipe and the flow rate is proposed and verified. However, chilled and hot water flow rates can be decreased as a result of insufficient pressure being set by the controllers. Consequently, indoor air conditions will deteriorate. Experiments to verify the characteristics of pumps and piping systems were conducted at the HVAC experimental facility at Chubu University. The energy consumption for constant pressure control was examined.
HVAC systems Secondary pumps Pumps controlled by VFD controller Two-way valves Variable water volume systems
Hidenobu Asai Motoi Yamaha Kazuo Naka
Graduate Student of Department of Architecture, Chubu University Professor of Department of Architecture, Chubu University,Matsumotocho 1200, Kasugai, Aichi, 487-850 Researcher, TOENEC Co., Ltd., Japan
国际会议
北京
英文
2007-09-07（万方平台首次上网日期，不代表论文的发表时间）