Mechanical pressurized air supply in refuge room of HVAC specialty in code for fire protection design of buildings


Independent mechanical pressurized air supply system is required for class A and class B shelters in articles 5.5.23 and 5.5.24 of the building code, while independent mechanical pressurized air supply system is not required for class C shelters corresponding to article 5.5.24a of the building code

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2 control of mechanical pressurized air supply in refuge Bay class a refuge Bay is set in the refuge floor

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3 how to calculate the mechanical pressurized air supply volume of refuge room? The air supply volume of class a refuge room is not less than 30m per square meter of net area ³/ H calculation, the air supply volume of class B refuge room is not less than 30m per square meter of net area ³/ H for cumulative calculation, the air supply volume of class C refuge room shall be calculated according to the front room of evacuation staircase or the front room of fire elevator, and then according to the air supply volume of class B refuge room, and the larger value of the two shall be taken as the pressurized air supply volume

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On the other hand, from the perspective of refuge, it is required that all refuge rooms in the system should be pressurized air supply, which forms a contradiction

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According to the net area of 12 ㎡, the pressurized air supply volume of a single refuge room is 360m ³/ h

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At the same time, the calculated value of pressurized air supply in class B refuge room is generally small (calculated according to the net area of 50 ㎡, the pressurized air supply in a single refuge room is 1500m) ³/ h

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Code for fire protection design of buildings: mechanical pressurized air supply in refuge room of HVAC discipline Jiao Hongzhao           The refuge Bay appears in articles 5.5.23, 5.5.24 and 5.5.24a of code for fire protection design of buildings (2018 Edition) gb050016-2014 (hereinafter referred to as the building code)

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In case of fire on a floor, start the mechanical pressurized air supply system of the first refuge Bay above the floor

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Because it is not used together with the front room of evacuation staircase or the front room of fire elevator, the usual practice is to set the pressurized air supply outlet on each floor as the normally open air outlet

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Classification of refuge rooms for the convenience of discussion, we divide refuge rooms into three categories

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The refuge rooms in super high-rise buildings specified in article 5.5.23 of the construction code are temporarily called class a refuge rooms; Class B refuge rooms are divided into two types, one is the refuge room in the ward specified in article 5.5.24 of the building code, which can be used for other purposes, but can not be the shared front room and staircase front room, and the other is the refuge room in the elderly care facilities specified in article 5.5.24a of the building code and not used with the front room of the evacuation staircase or the front room of the fire elevator《 The refuge room in the elderly care facilities specified in article 5.5.24a of the building regulations and using the front room of the evacuation staircase or the front room of the fire elevator is temporarily called class C refuge room

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The following is personal understanding and for reference only

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1

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Suggestion: after a fire, open the pressurized air supply outlet and pressurized air blower of the fire floor and its adjacent upper and lower front rooms and shared front rooms in the fire compartment for pressurized air supply; At a certain time after the basic evacuation of personnel, open all pressurized air supply outlets of the system to supply pressurized air to all refuge rooms of the system

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According to the net area of 25m2, the pressurized air supply volume of a single refuge room is 750m ³/ h

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On the one hand, for the pressurized air supply system of the front room of the evacuation staircase or the front room of the fire elevator, according to paragraph 2 of article 5.1.3 of the smoke label, open the fire floor and its adjacent upper and lower front rooms and shared front rooms in the fire compartment

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How to set its mechanical pressurized air supply system is not clear enough in the technical standard for smoke control and smoke extraction system of buildings gb51251-2017 (hereinafter referred to as the smoke standard)

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Therefore, class C shelters use the front room of evacuation staircase or the front room of fire elevator, How to control the mechanical pressurized air supply system has become a difficulty

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In case of fire on a floor, turn on the mechanical pressurized air supply system to pressurize and supply air to all refuge bays in the system

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), although not less than 30m per square meter ³/ H the cumulative calculation meets the requirements of the specification, but considering the use effect and maintaining positive pressure, it is recommended to increase it appropriately in the design, and the codes and standards should also specify the minimum value of pressurized air supply in a single refuge room

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Class B refuge Bay is set in the ward or elderly care facilities

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