Characteristics of fan-coil water system with on-off control

Based on the probability theory, calculates the total opening rate of on-off valves of the water system whose terminals are fan-coil units (FCUs) under the different room loads at a certain time. Using the weighted average of the opening rates of all FCUs calculates the total opening rate of the whole water system, whose error is less than 1%. Determines the variation range of the relative water volume based on the relationship between the relative water volume and the opening rate of the whole system at the time for the given properties including the relative pressure difference between supply and return water.