外文文献：
Sealed building drainage and vent systems
—an application of active air pressure transient control and suppression
Abstract
The introduction of sealed building drainage and vent systems is considered a viable proposition for complex buildings due to the use of active pressure transient control and suppression in the form of air admittance valves and positive air pressure attenuators coupled with the interconnection of the network#39;s vertical stacks.
This paper presents a simulation based on a four-stack network that illustrates flow mechanisms within the pipework following both appliance discharge generated, and sewer imposed, transients. This simulation identifies the role of the active air pressure control devices in maintaining system pressures at levels that do not deplete trap seals.
Further simulation exercises would be necessary to provide proof of concept, and it would be advantageous to parallel these with laboratory, and possibly site, trials for validation purposes. Despite this caution the initial results are highly encouraging and are sufficient to confirm the potential to provide definite benefits in terms of enhanced system security as well as increased reliability and reduced installation and material costs.
Keywords: Active control; Trap retention; Transient propagation
Nomenclature
C -——characteristic equations
c——wave speed, m/s
D——branch or stack diameter, m
f——friction factor, UK definition via Darcy Delta;h=4fLu2/2Dg
g——acceleration due to gravity, m/s2
K——loss coefficient
L——pipe length, m
t——time, s
u——mean air velocity, m/s
C -——特征方程
c——波速, m/s
D——分支或堆积直径, m
f——摩擦因子， 英国定义通过Darcy Delta;h=4fLu2/2Dg
K——损失系数
L——管长, m
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