The 2022 HVAC Dynamics Academic Annual Conference for Zhejiang Province and Hangzhou City was successfully held on November 18th at Hangzhou Wanhua International Hotel. This conference was jointly organized by the Building Environment and Energy Application Division of the China Survey and Design Association (Zhejiang), the HVAC Dynamics Academic Committee of the Zhejiang Civil Construction Society, the Fifth Professional Committee of the Zhejiang Refrigeration Society, and the Hangzhou HVAC Society. The conference's theme was "New Infrastructure, New Energy, New Challenges." This annual gathering is a highlight for HVAC professionals. Despite the severe pandemic situation, it did not dampen the enthusiasm of the HVAC community. Remarkably, the event drew over 500 attendees, a commendable assembly under the circumstances.

Mr. Yang Yi, the Chairman of the Zhejiang Refrigeration Society, congratulated the successful convening of the conference and delivered a speech. Xu Weimin, the Secretary-General of the Building Environment and Energy Application Division of the China Survey and Design Association (Zhejiang), read the congratulatory letter from the senior academic society with great enthusiasm.

Mr. Yao Guoliang, the Director of the HVAC Power Academic Committee of the Zhejiang Civil Architecture Society, presented a comprehensive work report on behalf of the provincial association. Meanwhile, Mr. Lin Xin, the Vice-Chairman of the Zhejiang Refrigeration Society and the Director of the Fifth Specialized Committee, summarized the conference's proceedings. He expressed his aspirations for the association to further strengthen collaborations and communications with HVAC equipment manufacturers. Mr. Lin emphasized the importance of actively promoting the adoption of innovative technologies, materials, and equipment. By doing so, they aim to make significant contributions to the HVAC power industry in Zhejiang Province and, on a broader scale, support China's commitment to energy-saving, green, low-carbon, and high-quality development.

LIJU, as an HVAC equipment manufacturer, participated in this grand event as one of the supporting organizations. Liu Nannan, the Marketing Director, delivered a keynote lecture titled "Reflections on Multi-Energy Complementary Heating Systems." She analyzed the current and future energy structure in China and shared her insights on multi-energy complementary heating systems.

According to the "China Energy Development Report 2022", even though coal's proportion in the total energy matrix has slightly declined, its dominant position as a primary energy source is challenging to shift in the short term. While the primary energy generation is coal-centric, clean energy generation (including natural gas, wind, solar, hydro, and nuclear power) continues to grow. However, due to absorption and distribution challenges, there's still a significant gap before achieving sustainable development.

In the prevailing coal-centric energy matrix, for the same heating capacity, gas boilers emit the least amount of CO₂ in comparison.

Based on the China Natural Gas Development Reports of 2021 and 2022, natural gas serves both as the "ballast" ensuring energy security and the "stabilizer" for integrating new energy into modern power systems. Both consumption and production are consistently rising, with projections indicating a plateau in growth by 2040.

Every energy source has its application constraints. For instance, solar and wind energy are influenced by weather conditions, making them inconsistent. Geothermal energy can be affected by the thermal properties of the soil, and wastewater heat recovery depends on the availability and volume of wastewater. Based on the 20th National Congress development report, during the proactive yet prudent advancement towards dual carbon goals (carbon peak and carbon neutrality), we need to reinforce the baseline thinking of energy security, establish standards before breaking old molds. Gas boilers, serving as one of the heat sources for heating, play an indispensable role in the multi-energy complementary heating system, whether they act as auxiliary heat sources for various new energy heat pumps or as peak-adjusting heat sources for centralized heating.

To devise the best multi-energy complementary heating system, it's vital to consider specific project circumstances, such as load demand, local climate, energy prices, and more. Solutions should be tailored to local conditions, and the optimal approach should be chosen after comprehensive technological and economic comparisons. The objective is to ensure energy conservation and environmental protection while balancing economic and societal benefits.