Flow characteristics of air heat exchangers and control valves

Yin Ping

2021.01.20

The flow characteristics of electric control valve and air heat exchanger, as well as their coupling relationship, directly affect the regulating quality and stability of water system, equipment utilization and economy. The experimental results show that the flow characteristic curves of the heater and the surface cooler are different. The current calculation formula of the flow characteristics of the heat exchanger can not be obtained by solving the heat transfer formula simultaneously. The flow characteristic calculation parameters of the heat exchanger are not constant. The flow characteristic curve of the surface cooler under different working conditions is different from that given by the traditional viewpoint, and the flow characteristic curve of the heater is the same at various hot water temperature differences. Different heat exchanger flow characteristics and control valve flow characteristics can not achieve “using a control valve with reverse nonlinear characteristics to compensate the nonlinear characteristics of terminal equipment”.