How to Conduct Combined Inlet and Outlet Testing for Cabinet-Type Centrifugal Smoke Exhaust Fans?

How to Conduct Combined Inlet and Outlet Testing for Cabinet-Type Centrifugal Smoke Exhaust Fans?

Combined inlet and outlet testing for cabinet-type centrifugal smoke exhaust fans helps to some extent to compensate for the limitations of standard testing equipment. It simulates the actual operating conditions of these fans, offering broad applicability and a comprehensive testing setup. At the same time, it allows for the refinement of measurement data to improve accuracy and plot the coordinate coefficients of the cabinet-type centrifugal smoke exhaust fan. These include the flow coefficient and the static pressure coefficient of the fan, enabling the rapid plotting of performance curves. Combined testing of the intake and exhaust ports typically employs the torque method and standard formulas. The collected data and results can be applied to performance testing of standardized air ducts. Key test items include water vapor saturation pressure, velocity, torque, and sound. Several existing indicators from both internal and external sources are utilized in the combined experiments. This provides convenient conditions for the experiments. The experimental setup uses cabinet-type centrifugal smoke exhaust fans and a data acquisition system, requiring the introduction of additional parameters and variables. Taking the cabinet-type centrifugal smoke exhaust fan as today’s example, consider the Y114M-5 motor. The motor has a rated output power of 4 kW and a rated speed of 1438 r/min. Based on atmospheric indices, the gas constant C, and atmospheric density ε, followed by the expansion coefficient ι of the cabinet-type centrifugal smoke exhaust fan and the static pressure loss λ from the gas to the inlet, the relative static pressure p1 and total pressure p2 are obtained. p2, and the inlet total pressure. Next, calculations are performed for the inlet and outlet to determine the inlet and outlet static pressures and internal power, respectively, thereby calculating the fan’s internal efficiency. Total pressure correction factors and static pressure correction factors can be obtained through pressure conversion. Fan pressure coefficients, internal power parameters, specific speed fan ratio A, acoustic and flow coefficients