Key technical requirements of Taizhou ultra-low energy consumption, near zero (zero) energy consumption building demonstration proje

From Green Building Society

First, standard basis

The demonstration projects of ultra-low energy consumption and near-zero (zero) energy consumption buildings shall meet the relevant provisions of the national standard "Technical Standards for Near-Zero Energy Consumption Buildings" (GB/T 51350-2019), and shall conform to the relevant provisions of the current national and local standards. The design evaluation can be carried out after the construction drawing design document is reviewed.

2. Technical path

According to the climatic characteristics of Taizhou and the project site conditions, passive design should be adopted to greatly reduce the building heating, air conditioning and lighting requirements, and active technical measures should be taken to improve the efficiency of energy equipment and systems, make full use of renewable energy, and provide a comfortable indoor building environment with less energy consumption. According to the building energy efficiency level from low to high, to achieve ultra-low energy consumption, near zero energy consumption and zero energy consumption buildings.

Three, index requirements

It is recommended that buildings with ultra-low energy consumption and near zero (zero) energy consumption be designed according to the recommended index parameters of key energy-saving measures such as enclosure structure, energy equipment and system, and ultimately meet the binding index requirements of indoor environmental parameters and energy efficiency indicators.

1. Requirements for indoor environment parameters

The indoor environment parameters of the main room of the building shall meet the requirements of Table 3.1.1.

Table 3.1.1 Indoor environment parameter requirements for main rooms of the building

Note:

① Indoor relative humidity in winter does not participate in equipment selection and energy efficiency index calculation.

(2) The fresh air volume should refer to the provisions of "Design Code for Heating, Ventilation and Air Conditioning of Civil Buildings" GB 50736.

(3) The indoor noise level should refer to the provisions of the national standard "Code for Sound Insulation Design of Civil Buildings" GB 50118.

2. Energy efficiency index requirements

Building energy efficiency indicators shall meet the requirements in Table 3.2.1 and 3.2.2.

Table 3.2.1 Energy efficiency index requirements for residential buildings

Note:

① The comprehensive value of building energy consumption is calculated within the energy consumption range of building heating, air conditioning, ventilation, lighting, domestic hot water and elevator, and the energy generation of renewable energy is considered, excluding the energy consumption of cooking, household appliances and sockets. The calculation base area is the used area in the residential unit.

②WDH20 is the hourly cumulative value of the difference between the outdoor wet bulb temperature and 20℃ when the outdoor wet bulb temperature is higher than 20℃ in a year (unit: kKh, thousand degree hour). DDH28 is the hourly cumulative value of the difference between the wet bulb temperature and 28℃ when the outdoor dry bulb temperature is higher than 28℃ in a year (unit: kKh, thousand degree hour).

③ Meteorological parameters are selected according to the current industry standard "Meteorological Parameters Standard for Building Energy Conservation" JGJ/T346.

Table 3.2.2 Energy efficiency index requirements for public buildings

Note:

① The comprehensive energy saving rate of the building and the energy saving rate of the building body should meet the requirements of the national standard "Energy Saving Design Standard for Public Buildings" GB50189-2015 as the benchmark building.

Iv. Key energy-saving measures

4.1 Related requirements for building envelope design

(1) The thermal performance of the enclosure structure should meet the requirements in Table 4.1.1 and Table 4.1.2.

Table 4.1.1 Thermal performance requirements of main envelope of residential buildings

Table 4.1.2 Thermal performance requirements of main envelope of public buildings

(2) The architectural design should make full use of natural lighting, natural ventilation and thermal insulation of the envelope and other passive building design means.

(3) High performance door and window system should be adopted. Glass should be filled with three glass and two cavities, vacuum glass, inert gas, warm edge interval and other measures. Profiles should be insulated profiles aluminum alloy, PVC plastic, aluminum wood composite, aluminum plastic co-extrusion, polyurethane and other materials with good thermal insulation performance.

(4) Adjustable external shading facilities should be set up in the east-west direction, and adjustable external shading facilities, medium shading or fixed horizontal shading should be used in the south direction. It is advisable to adopt the integration technology of exterior window shading.

(5) When designing the building envelope, special design should be carried out to eliminate or weaken the thermal bridge, and the insulation layer of the envelope structure should be continuous.

(6) When designing the envelope structure, special design of air tightness should be carried out. The air-tight layer of the building envelope should be continuous and surround the entire outer envelope. The location of the air-tight layer should be clearly marked in the building design and construction drawing.

4.2 Requirements for heating and cooling systems

(1) The design of heating and cooling system should choose the first class energy efficiency products, and should meet the current relevant standards and requirements of Zhejiang Province.

(2) The transmission and distribution system equipment such as circulating water pump and fan should adopt frequency control.

(3) Fresh air heat recovery system should be set up. The fresh air, exhaust air and air supply pipes connected with the outdoor should be equipped with thermal insulation and airtight electric air valves, and should be linked with the system; Air purification device should be available; It should have the bypass function. In the transition season or when the enthalpy difference between indoor and outdoor is small, fresh air can directly enter the room or air treatment device through the bypass pipe.

The performance parameters of the fresh air heat recovery system shall meet the requirements in Table 4.2.1.

Table 4.2.1 Performance parameters of the fresh air heat recovery system

(4) The power consumption per unit air volume of residential buildings should not be greater than 0.45(W/(m3·h), and the power consumption per unit air volume of public buildings should be 20% lower than the requirements of the current national standard "Design Standard for Energy Conservation of Public Buildings" GB 50189.

4.3 Lighting and elevator system related requirements

(1) The indoor lighting power density should reach the target value stipulated by the current national standard GB50034, and should reach less than 70% of the target value stipulated by the current national standard GB50034, Architectural Lighting Design Standard.

(2) The elevator system should adopt energy-saving control and driving system. When two or more elevators are arranged in a centralized manner, it should have group control function; When the elevator has no external call and there is no preset instruction in the elevator car for a period of time, the car lighting and fan should be automatically turned off; Energy-saving elevator should be selected, such as frequency control drive or energy feedback device.

4.4 Monitoring and control system related requirements

(1) Public buildings should be classified and itemized according to energy consumption accounting units and energy consumption systems, as well as different forms of energy consumption such as cold, heat and electricity, and meet the Design Standard of Itemized Metering System of Electricity Consumption for Public Buildings DB33/1090; Residential buildings should be classified and itemized for the main energy use system of the public part.

(2) The indoor environment of the main functional space of the building should be monitored. Public buildings should be tested by layers, orientations and types. Residential buildings should monitor the indoor environment of typical households.

(3) When renewable energy is used, it should be measured separately.

Five, index judgment

In the design stage, the key energy-saving measures adopted by the building are evaluated, and the performance design is carried out through the building energy consumption simulation software to determine whether the energy efficiency index meets the standard requirements.