What Is Building Energy Management?

The energy management system for intelligent buildings is mainly implemented by the building equipment management system (BAS system).

Intelligent Building Energy Management System

With the development of China's economy, the problem of high energy consumption in office buildings and large public buildings of state agencies has become increasingly prominent. At present, China's annual construction area is about 2 billion meters, of which about 400 million meters are public buildings. Large public buildings with an area of over 20,000m account for less than 4% of the urban building area, but energy consumption accounts for more than 20% of the building energy consumption, in which the power consumption per unit area is 10 to 15 times that of ordinary residential buildings. In the annual energy consumption of public buildings (especially large shopping malls, high-end hotels, high-end office buildings, etc.), about 50% to 60% are consumed by air-conditioning refrigeration and heating systems, and 20% -30% are used for lighting.

Among the existing 43 billion m buildings in China, only 4% have adopted energy efficiency measures, and the heating energy consumption per unit building area is more than three times that of newly built buildings in developed countries. According to estimates, if no effective measures are taken, China's building energy consumption will be more than three times by 2020. Therefore, doing a good job in energy conservation management of large public buildings is of great significance to achieve the "11th Five-Year" building energy-saving planning goals.

Currently,

According to foreign engineering experience, the building equipment management system (BAS system) can save about 20% of energy for new office buildings. However, according to statistics, less than 10% of the domestic intelligent buildings have actually achieved energy-saving goals, and more than 80% of BAS systems in intelligent buildings are only used for equipment status monitoring and automatic control, causing great waste of investment.

The specific reasons are various, but the root cause is that China has not yet established a set of effective building energy-saving test methods, and the BAS system is an engineering product, not a complete set of equipment, and requires BAS system engineers to do secondary programming on the site. In order to realize the control function, the system performance is greatly affected by the human factors of the field engineer. With the addition of many smart building builders, managers, and users, there are few users who really care how much energy is saved, and users save energy What is the input-output ratio? In fact, due to the lack of energy use models and perfect measurement methods for buildings, even if users ask the above questions, accurate data cannot be obtained.

Therefore, it is necessary to set up an energy management system in the intelligent building, monitor, analyze and manage the energy efficiency of the building ground equipment, and establish a building energy consumption model in order to truly achieve the purpose of energy saving.

Intelligent building refers to a building as a platform that has both information facility systems, information application systems, building equipment management systems, and public safety systems. It integrates structure, systems, services, management and its optimized combination to provide people with security, Efficient, convenient, energy-saving, environmentally friendly and healthy built environment. "

(1) Select ACR330ELH instrument for high-voltage circuit or low-voltage incoming circuit ^[3]

The meter is a power quality analysis instrument. The main functions are: LCD display, full electrical parameter measurement (U, I, P, Q, PF, F, S); four-quadrant power measurement, multi-rate energy statistics; THDu, THDi, Harmonic components of each order from 2 to 31; voltage crest factor, telephone form factor, current K factor, voltage and current unbalance calculation; grid voltage current positive, negative, and zero sequence components (including negative sequence current) measurement; 4DI + 3DO (DO3 for over-voltage, under-voltage, over-current, imbalance alarm); RS485 communication interface, Modbus protocol or DL / T645 protocol. Dimensions: 120 × 120mm, opening size: 108 × 108mm. Suitable for high-voltage important circuits or low-voltage incoming cabinets.

(2) Select ACR220EL power meter for low-voltage communication or outgoing circuit ^[3]

The main functions of the meter are: LCD display, full electrical parameter measurement (U, I, P, Q, PF, F); four-quadrant energy measurement, multi-rate energy statistics, maximum demand statistics; 4DI + 2DO; RS485 communication interface , Modbus protocol. Dimensions: 96 × 96mm, opening size: 88 × 88mm. Suitable for low-voltage contact cabinets and outlet cabinets.

(3) Select ACR120EL power meter ^[3] or rail type electric meter ^{[4] for} power cabinet and lighting box ^.

The main functions of ACR120EL power meter are: LCD display, full electric parameter measurement (U, I, P, Q, PF, F); four-quadrant energy measurement, multi-rate energy statistics, maximum demand statistics; 2DI + 2DO; RS485 communication Interface, Modbus protocol. Dimensions: opening size 80 × 80mm, opening size 72 × 72mm. Suitable for power cabinets.

Main functions of DTSD1352 rail-type electricity meter: LCD display, full electric parameter measurement (U, I, P, Q, PF, F, S); four-quadrant energy measurement, multi-rate energy statistics, maximum demand statistics; current specification 1.5 ( 6) A, 5 (20) A, 10 (40) A, 20 (80) A are optional, RS485 communication interface, Modbus protocol or DL / T 645 protocol are optional. Dimensions: 126 × 89 × 74mm, 7 modules. Suitable for power cabinets.

DTSF1352 rail type electricity meter main function: current specifications 1.5 (6) A, 5 (20) A, 10 (40) A, 20 (80) A optional, multi-rate energy statistics, energy pulse output, RS485 communication interface, Modbus Protocol or DL / T 645 protocol is optional. Dimensions: 126 × 89 × 74mm, 7 modules. Suitable for three-phase energy measurement of lighting boxes.

Main functions of DDSF1352 lighting meter: current specifications 1.5 (6) A, 5 (20) A, 10 (40) A, 20 (80) A optional, multi-rate energy statistics, energy pulse output, RS485 communication interface, Modbus Protocol or DL / T 645 protocol is optional. Dimensions: 76 × 89 × 74mm, 4 modules. Suitable for current and voltage measurement of lighting box; single-phase energy measurement.