TAILIEUCHUNG - PUMPS AND FANS

The performance characteristics of centrifugal pumps and fans (., rotating fluid machines) are described by the same basic laws and derived equations and, therefore, should be treated together and not separately. | CHAPTER 55 PUMPS AND FANS William A. Smith College of Engineering University of South Florida Tampa Florida PUMP AND FAN SIMILARITY 1681 SYSTEM DESIGN THE FIRST STEP IN PUMP OR FAN SELECTION 1682 Fluid System Data Required 1682 Determination of Fluid Head Required 1682 Total Developed Head of a Fan 1684 Engineering Data for Pressure Loss in Fluid Systems 1684 Systems Head Curves 1684 CHARACTERISTICS OF ROTATING FLUID MACHINES 1687 Energy Transfer in Rotating Fluid Machines 1687 Nondimensional Performance Characteristics of Rotating Fluid Machines 1687 Importance of the Blade Inlet Angle 1689 Specific Speed 1690 Modeling of Rotating Fluid Machines 1691 Summary of Modeling Laws 1691 PUMP SELECTION 1692 Basic Types Positive Displacement and Centrifugal Kinetic 1692 Characteristics of Positive Displacement Pumps 1692 Characteristics of Centrifugal Pumps 1693 Net Positive Suction Head NPSH 1693 Selection of Centrifugal Pumps 1693 Operating Performance of Pumps in a System 1694 Throttling versus Variable Speed Drive 1695 FAN SELECTION 1696 Types of Fans Their Characteristics 1696 Fan Selection 1696 Control of Fans for Variable Volume Service 1698 PUMP AND FAN SIMILARITY The performance characteristics of centrifugal pumps and fans . rotating fluid machines are described by the same basic laws and derived equations and therefore should be treated together and not separately. Both fluid machines provide the input energy to create flow and a pressure rise in their respective fluid systems and both use the principle of fluid acceleration as the mechanism to add this energy. If the pressure rise across a fan is small 5000 Pa then the gas can be considered as an incompressible fluid and the equations developed to describe the process will be the same as for pumps. Compressors are used to obtain large

TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.