How to design the weak electric room of the commercial complex? How is it different from an ordinary machine room?

1. System overview

    The computer room for this tender is the building network communication computer room and the fire control center computer room. Fire control room computer room on the first floor (security control center, intelligent control network network computer room, fire monitoring center, building monitoring center, public broadcasting control center), with a construction area of 150 square meters. In addition, a room of about 32 square meters is separated from the fire control room The equipment room of meters is used to place intelligent control network network equipment, UPS power supply equipment, etc.; the telecommunications room on the basement floor is separated from a network room, which is used as the network room of the property management network, wireless AP network and POS cash register network. The construction area About 46 square meters, the computer room project involves computer room decoration, electrical technology, air and temperature regulation, electronic technology, communication technology, weak current engineering system, etc. The specific computer room design and construction needs to solve temperature and humidity control, cleanliness, static electricity protection, lightning protection, electromagnetic interference protection, power distribution, UPS, air conditioning, etc.

The project content mainly includes the following parts:

Computer room structure and decoration

Supply and distribution system

Computer room air conditioning system

UPS system

The fire control computer room on the first floor, with an area of about 150m2, is mainly used as the computer room for the integrated wiring system and monitoring system. The computer room project includes computer room decoration, lighting, power distribution, wiring, grounding and lightning protection.

The basement floor is separated from the telecommunications room by a network room, with an area of about 46 square meters.

Each weak current wiring room shares one weak current well according to the integrated wiring and weak current equipment settings, and multiple wiring rooms are divided according to system needs.

The computer room engineering air-conditioning fresh air exhaust and smoke exhaust and fire alarm gas fire extinguishing are in charge of other departments.

In accordance with the "Data Center Design Specification", construct the infrastructure of the computer room, including interior decoration, power distribution system (including power distribution cabinet, uninterruptible UPS power supply), lightning protection grounding system, air conditioning system, wiring of the wiring system, etc.

2. System Requirements

2.1 Equipment Room Decoration Engineering Requirements

The decoration of the computer room should reflect the characteristics of the computer room area. From the inside, it should embody the high-tech working environment, rigorous scientific atmosphere, simple and elegant decoration lines, solemn and elegant decoration colors, and the people-oriented environmental protection decoration concept. The decoration of the computer room shall be carried out in strict accordance with the corresponding national standards and regulations.

top surface

The ceiling of the computer room needs to meet the requirements of energy saving, fire prevention, dustproof, waterproof, antistatic, and rodent and insect prevention.

The network communication room adopts aluminum-magnesium alloy 600*600mm microporous plate ceiling, and the fire control room adopts calcium silicate 600*600mm square ceiling ceiling, and uses ceiling decoration to cover various pipelines, probes, etc. The installation of lamps and various probes should be organically combined with the ceiling, so that the decoration of the machine room can achieve a harmonious and unified effect.

The ceiling area of the network communication room shall be treated with anti-dust and anti-static treatment. After derusting metal connectors and rivets, anti-rust paint shall be applied twice.

ground

The antistatic raised floor should meet the requirements of the current national standard "Technical Conditions for Raised Floors for Computer Rooms". The specification is 600×600×35mm, the concentrated load is greater than or equal to 5000N/m2, the dispersed load is greater than or equal to 17500N/m2, and the antistatic insulation value is 1×107Ω～1×109Ω. Dust-proof treatment shall be done under the floor, the ground shall be flat and wear-resistant, and materials shall be selected that are not dust-proof, not easy to accumulate dust, and easy to clean.

The height of the static floor is not less than 300mm; the fire control room adopts the overall air-conditioning system of the building, the height of the static floor is not less than 20mm, and wiring troughs, pipelines, bridges and sockets are arranged under the static floor.

All holes and pipes entering and exiting the computer room must be treated against rodents (including cable wells).

the wall

The partition wall windows of the network communication room and the IT manager's room are made of cesium potassium glass and wrapped with stainless steel.

Door

The wooden class A fire door is adopted.

2.2 Computer room lighting

The lighting equipment in the machine room adopts high-efficiency embedded aluminum alloy grille, stainless steel reflective arc cover lamp panel, and three-color fluorescent tube. The design illuminance of the network communication room is not less than 500Lux, and the illuminance of the fire control room is not less than 300Lux. There is no glare in the computer room, and the glare restriction level is Class II; other areas such as the UPS room may have slight glare, and the glare restriction level is Class III.

2.3 Fire prevention in the computer room

1) An automatic fire alarm system and an automatic gas fire extinguishing device should be installed in the computer room. The specific fire protection design shall be considered uniformly by the building.

2) The decoration materials in the machine room must choose non-combustible or difficult-to-combustible materials.

3) Smoke prevention outlets are set in the machine room, and the smoke is exhausted by the gas fire protection system. The fresh air outlet in the machine room is considered by the machine room decoration.

2.4 Power distribution in the computer room

1) It adopts the mains power supply and the standby generator for power supply, and switches between UPS power distribution.

2) A． Overview of Design Requirements

According to the tender floor plan.

The bidder determines the level of power supply according to the importance of the operating load, and designs the power distribution part. The electrical system of the computer room includes power, lighting, monitoring, communication, maintenance and other electrical systems in the computer room area. According to the nature of the load, it is divided into computer equipment load and auxiliary equipment load. Computer equipment and power equipment should be powered separately. The composition of the power supply and distribution system includes power distribution cabinets, power cables, wire slots and sockets, grounding and lightning protection, lighting boxes and lamps, emergency lights, electrostatic protection, leakage protection and grounding systems, and lighting pipes. Special power distribution cabinets for computer equipment and other equipment distribution cabinets should be set up independently.

B． system design

The bidder shall design the grounding body in the computer room according to the national lightning protection and grounding regulations, and make a comprehensive, strict and detailed design plan for the lightning protection and static grounding scheme.

Load level: IT equipment in the computer room is the first-level load, and emergency lighting and fire-fighting equipment are the second-level loads, powered by the important load bus. The air conditioner is a three-level load and is powered by the mains.

The evacuation channel is set up according to the requirements of the code, and the indicator light with its own battery is used, which is powered by the important load bus and the mains supply power.

Power distribution cabinets: Mains output power distribution cabinets and UPS output power distribution cabinets all use world-renowned electrical components, products whose reliability has been recognized.

Maintenance socket: In the computer room, the power socket for maintenance and cleaning should be considered, and the power supply is drawn from the mains.

The power supply mode of the main equipment in the computer room of the network communication room and the main equipment in the control center is the first-level power supply mode, and an uninterruptible power supply system needs to be established. All UPS incoming circuits should use dedicated lines, and must not share the same cable and switch with other loads.

Use A-level standard for power supply of equipment in the computer room:

The computer room adopts the way of wiring from above to ensure that there is no connection point for power wires under the floor.

Voltage fluctuation range: ±5%

Frequency fluctuation range: ≤±0.2Hz

Waveform distortion rate: 3-5%

Powered by TN-S system

Voltage 380V/220V

The incoming line is a three-phase five-wire system

All strong and weak current cables in the machine room should be laid through metal grooves (pipes). Strong and weak current cables cannot be laid in the same groove (pipe). Bridges and wire pipes are hot-dip galvanized products.

Each cabinet is equipped with 2-way 16A UPS power supply;

The power supply in the cabinet adopts the power distribution method of a dedicated PDU power module;

The power wiring of the cabinet adopts low-smoke and halogen-free flame-retardant cables, and the wires are not less than 4mm;

3) Other system equipment such as security systems, TV systems, and BAS building self-control systems use uPS power supplies and adopt centralized power supply methods, that is, design power conversion boxes in weak current rooms where control signals of weak current equipment on each floor are centralized, and UPS AC 220V After being converted into DC12V, it is output to each power consumption point through a RVVP2X1.0 wire. The DDC power supply of the BAS building self-control system is terminated at the UPS distribution box in the wiring room on this floor.

4) The electrical equipment and distribution lines in the computer room are equipped with two levels of protection against short-circuit and overload. At the same time, all levels of the power distribution system are selectively coordinated, and the power distribution is radially supplied to the electrical equipment.

5) All cables of the power distribution system in the computer room are made of flame-retardant polyvinyl chloride insulated conductors and flame-retardant cross-linked polyvinyl chloride insulated power cables, and are laid through galvanized metal trunking or galvanized steel pipes.

2.5 Grounding and lightning protection of the computer room

1) The working ground, safety protection ground, and lightning protection grounding of the power distribution system in the computer room adopt a joint grounding method; The row is laid under the raised floor, according to the layout of the computer equipment, the grid is formed vertically and horizontally, equipped with a special grounding terminal, and connected to the computer and other equipment with the shortest length of braided soft copper wire.

2) The access floor that is prone to static electricity is made of wires to form a leakage net, and the main line is used to lead to the AC grounding terminal in the power distribution cabinet.

3) A surge protector is installed at the power inlet of the power distribution cabinet; a surge protector must be installed when the signal line enters the machine room from the outside.

4) The weak current room of all wiring rooms needs to be equipped with LEB equipotential termination bodies. This grounding body is reliably welded to the grounding lead of the building. The grounding points of all cabinets and weak current equipment are connected to LEB, and the wire diameter is not less than 6mm.

2.6 Wiring requirements in the computer room

The power supply line of the computer room should adopt overvoltage protection measures in accordance with the "Code for Lightning Protection Design of Buildings" and "Technical Specifications for Lightning Protection of Building Electronic Information System", and the power supply of the special distribution box should use cable incoming lines.

The power distribution lines in the machine room should be laid with flame-retardant copper core wires or cables in the ceiling/under the raised floor through metal pipes/slots, and corresponding shielding measures should be taken. Computer load distribution lines are in accordance with the national standard with a margin.

The control and signal cables of computers, computer auxiliary equipment (printers, data terminals, etc.) Shielding measures.

Distribution or signal wires/cables of different voltage levels should be laid in separate slots/pipes.

Strong and weak wire slots/pipes should be separated by a corresponding distance.

The computer power socket is installed on the raised raised floor, and the wiring is led from the UPS output distribution cabinet through the metal wire groove to various parts of the computer room from under the raised floor. Every two computer sockets are controlled and powered by the same switch.

2.7 UPS power supply device in computer room

UPS configuration: A three-input and three-out 60KVA UPS is installed in the fire control room as the equipment in the fire control room [fire system host equipment (10KVA), intelligent control network equipment, public broadcasting system, equipment monitoring system, wireless intercom system, video security monitoring System, electronic inspection system, parking lot management system workstation and related equipment and intelligent integrated system equipment] provide uninterruptible power supply, and a three-input and three-outlet 30KVA UPS is installed in the network computer room to provide uninterruptible power supply for the equipment in the network computer room, and the mains power is interrupted The back-up time of UPS with full load is 30 minutes.

The UPS power supply of this project floor adopts the regional UPS power supply system. On the negative floor, 1# weak electric well, 2# weak electric well, 3# weak electric well, 5# weak electric well, 6# weak electric well, 7# weak electric well, 12# weak electric well, 13# weak electric well, 15# weak electric well, 21# weak electric well, 22# weak electric well, 24# weak electric well, and 25# weak electric well are each equipped with a 5KVA UPS, a total of 13 units are configured. After the mains is interrupted, the UPS will take full load backup The time is 30 minutes, and it is led from the UPS of each weak current well on the negative floor to the floor distribution box of the corresponding weak current well UPS on each floor. The UPS input cable is provided by Qiangdian Professional.

2.8 Requirements for precision air conditioners

The machine room is a first-level load power supply unit, which provides dual-circuit power supply to the machine room. The power distribution room of the building leads two power sources to the machine room respectively, one of which is used for air conditioning, lighting, etc., and the other is powered by UPS power supply.

According to the size of the computer room and the configuration of the heat generated by the equipment. Install three 5P split air conditioners in the fire control room (excluding the equipment room in the fire control room), one 5P split air conditioner in the equipment room in the fire control room, and a 10KW precision air conditioner in the network computer room.