| 摘要 |
A method and apparatus for generating a rate of flow signal which is proportional to the flow rate in a fluid distribution system and which is based on a signal which is proportional to the speed of the fluid circulating device and which makes use of the characteristic curves of a fluid circulating system and fluid delivery device is disclosed. In an air-conditioning system having a variable speed supply fan and a variable speed return fan, a method and apparatus for controlling the capacity of the return fan to closely match that of the supply fan is provided. The method comprises the steps of; monitoring the supply fan speed and discharge pressure and generating a first signal which is a measure of the supply fan capacity at the monitored speed, matching the return fan capacity with the supply fan capacity to achieve any required ratio of return fan output to supply fan output and generating a second signal which is a measure of the desired return fan speed required to provide the return fan output and driving the return fan at the measured speed indicated by the second signal.
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