What is Building Energy Efficiency Testing?

Building Energy Efficiency Testing is a crucial component of the building inspection industry. Through professional technology and instruments, it involves testing the thermal performance and energy consumption of building envelopes, heating, ventilation, air conditioning, and lighting systems to assess whether they meet national energy efficiency standards. This ensures energy efficiency during the design, construction, and operation phases of a building. It typically includes testing the heat transfer/air tightness of building envelopes (walls, roofs, doors, and windows) and system function testing (such as air conditioning energy efficiency ratio, illuminance, etc.). It is a key link in achieving green buildings and energy-efficient renovations of existing buildings.

Main Testing Objects

• Building Envelope: Thermal insulation and airtightness performance of walls, roofs, floors, doors, windows, and curtain walls.

• Heating, Ventilation, and Air Conditioning Systems: Cold and heat sources (chiller energy efficiency ratio), pipeline transmission efficiency, hydraulic balance, ventilation system airflow, etc.

• Power Distribution and Lighting Systems: Average illuminance, lighting power density, etc.

• Renewable Energy Systems: Ground source heat pumps, solar energy system performance.

Main Testing Content and Methods

• Building Envelope:

　　• On-site testing: Using heat transfer coefficient meters, infrared thermal imagers, etc., to test the heat transfer coefficient of walls and roofs, and the airtightness of windows.

　　• Laboratory testing: Testing the thermal conductivity of materials (such as insulation materials).

• System Testing:

　　• Heating: Heating system pipeline efficiency, water replenishment rate, indoor temperature and outdoor temperature difference.

　　• Air Conditioning: Chiller energy consumption, chilled water system flow rate, fan power consumption, etc.

　　• Lighting: Illuminance measurement using an illuminance meter.

• Overall Evaluation: Combining testing data with design standards to evaluate the building energy efficiency rating (e.g., 1-5 stars).

Standards

Mainly based on national and local building energy efficiency design standards and testing specifications, such as GB 50411-2007 "Code for Acceptance of Construction Quality of Building Energy Saving Engineering", JGJ 132-2009 "Energy Saving Inspection Standard for Heating Residential Buildings", etc.

Purpose

To ensure that buildings meet energy-saving design goals, verify the quality of energy-saving projects, provide data support for building operation energy management and renovation, and promote sustainable development.