On January 5, 2023, the industry authoritative group standard T/CRAAS1085-2023 "Green Intelligent Multi-connected Air Conditioning (Heat Pump) Unit" was officially released by Midea Building Technologies, China Refrigeration and Air Conditioning Industry Association Refrigeration and Air Conditioning Engineering Working Committee and Hefei General Mechanical and Electrical Products Inspection Institute Co., Ltd. It will be implemented on February 1, 2023.

Midea MDV multi-connected system

Green product design and intelligent function are two important directions for the development of multi-connected air conditioning products.

In recent years, with the development of cloud computing, big data, edge computing, Internet of Things, artificial intelligence, 5G and other intelligent technologies, multi-connected air conditioning (heat pump) units are becoming more and more intelligent, bringing new feelings and experiences to users. However, the design level of multi-connected heat pump air conditioning system with intelligent function is uneven among manufacturers, and the design standards of product function and performance have not been refined and unified.

At present, the evaluation of multi-connected air conditioning (heat pump) units in the industry stays on the evaluation of basic parameters, functions and reliability of products, and the evaluation of green attributes, energy consumption reduction and intelligent functions of products themselves and in the process of installation, use and maintenance is still in the exploratory stage. With the introduction and implementation of relevant national policies and regulations, the establishment of systematic and comprehensive evaluation standards for green and intelligent multi-connected air conditioning (heat pump) units is particularly important to promote the further development of the industry.

T/CRAAS1085-2023 "Green Intelligent Multi-connected Air Conditioning (Heat Pump) Unit" issued this time takes the lead in formulating the technical requirements, test requirements and inspection rules that should be followed according to the attributes and intelligent functions of multi-connected green products. The evaluation dimension of product energy consumption is expanded from single equipment energy efficiency to grid response, standby power consumption, efficient components, intelligent management and other dimensions to guide the further reduction of energy consumption of multi-connected air conditioning (heat pump) units, which provides a reference for energy-saving renovation of existing buildings and new green buildings.

In the process of standard formulation, Midea Building Technologies led the standard formulation team to carry out relevant thematic discussions. On the basis of summarizing the design and evaluation of green products and intelligent functions of domestic refrigeration and air-conditioning equipment, it absorbed the practical achievements of many representative professional enterprises in recent years, and widely solicited the opinions of relevant units and industry experts in various ways. At the same time, the formulation of standards can not be separated from Midea Building Technologies, which has been paying attention to every individual in the building space for many years, constantly breaking through the technical boundaries, bringing innovative products of unbounded multi-connection, and making MDV multi-connection move from factory low-carbon to full life cycle low-carbon.

Aiming at the goal of improving the overall energy efficiency, the components of the indoor unit are fully DC, which saves about 7% energy compared with the AC indoor unit.

For long-term operation energy efficiency, the performance degradation of 12% * 1 can be reduced by dirty and blocked identification, and the energy consumption of 10% * 2 can be reduced by refrigerant degradation identification every year.

In view of the performance attenuation of partial load in the high energy consumption area, the coordinated control of MPC indoor and outdoor units can achieve a load rate of more than 20% without frequent start and stop, and the refrigeration condition can save energy by more than 21% * 3.

For the management of behavior energy saving, through the personalized intelligent control of partial time and local space, such as automatic shutdown when no one is present, automatic adjustment when the set temperature is too high or too low, it can save more than 20% energy while meeting the comfort * 4.

Building energy consumption and carbon emissions account for 21% of the total social energy consumption and carbon emissions, of which the energy consumption of air-conditioning system accounts for 49% of the building energy consumption, and the multi-connected air-conditioning system, which accounts for 49.6% of the market share of central air-conditioning, is undoubtedly the top priority of energy saving and emission reduction. The MDV multi-split unit redefines the low carbon standard. Only the large-scale production of the integrated arc heat exchanger can reduce the total emission of 5,984,274 tons in the whole life cycle. The carbon reduction benefit brought by the MDV multi-split unit can reduce the emission of the building operation by 0.3% based on the annual carbon emission of about 2 billion tons.

In order to contribute to the realization of smart ecology and carbon neutrality, Midea Building Technologies advocates manufacturers to promote feasible technologies to reduce carbon emissions under the guidance of corresponding standards. The release of green wisdom evaluation criteria in the field of multi-connected machines not only provides the basis for users to choose products from the actual needs of users, but also provides the basis for users to choose products. At the same time, it also reflects the latest development trend of scientific research, which can guide the industry to continue the technological innovation of green design and intelligent function of multi-connected products, and promote the iterative upgrading of products, so as to promote the healthy development of the whole air-conditioning industry.

* 1 Measured result of 50% air volume loss of indoor unit due to assumed dirt blockage

* 2 Simulation results assuming 20% system refrigerant leakage

* 3 Based on laboratory measured results

* 4 Based on cloud platform data and measured results

2023年1月5日，由美的楼宇科技、中国制冷空调工业协会制冷空调工程工作委员会、合肥通用机电产品检测院有限公司主导的行业权威团体标准T/CRAAS1085-2023《绿色智慧多联式空调（热泵）机组》正式发布，并将于2023年2月1日开始实施。

美的MDV多联机

绿色产品设计、智能化功能是多联式空调产品发展的两个重要方向。

近几年随着云计算、大数据、边缘计算、物联网、人工智能、5G等智能技术的发展，多联式空调（热泵）机组越来越智能化，给用户带来新的感受和体验。但各厂家对于具有智能功能的多联式热泵空调系统设计水平参差不齐，产品功能、性能等设计标准尚未细化及统一。

目前行业对于多联式空调（热泵）机组评价停留在对产品基本参数、功能和可靠性的评价上，对其产品本身以及安装、使用和维护过程中的绿色属性、运行能耗降低和智能化功能评价处于摸索阶段。随着国家相关政策、法规的推出与实施，体系化、全面的绿色、智慧型多联式空调（热泵）机组产品评价标准的建立对推动行业的进一步发展尤为重要。

本次发布的T/CRAAS1085-2023《绿色智慧多联式空调（热泵）机组》率先根据多联机绿色产品属性、智慧功能，制定了其应当遵循的技术要求、试验要求及检验规则。将产品能耗评价维度从单一的设备能效拓展至电网响应、待机功耗、高效零部件、智慧管理等维度，引导进一步降低多联式空调（热泵）机组能耗，为既有建筑节能改造、新建绿色建筑提供参考。

在标准制定过程中，美的楼宇科技牵头规范编制组开展了相关专题研讨，在总结国内制冷空调设备绿色产品和智能化功能设计和评价基础上，吸收近年来众多有代表性专业企业实践成果，并以多种方式广泛征求了全国各有关单位和行业专家的意见。同时，标准的制定也离不开美的楼宇科技多年来始终关注建筑空间里的每一个个体，不断突破技术界限，带来无界多联创新产品，让MDV多联机从出厂低碳迈向全生命周期低碳。

针对提升整体能效的目标，内机部件全直流化，相较于交流内机节能7%左右。

针对长期运行能效，脏堵识别可减少12%*1的性能衰减，冷媒衰减识别每年可减少10%*2 的能耗。

针对高能耗区间部分负荷的性能衰减，MPC内外机协同控制可实现20%以上负荷率无频繁启停，制冷工况节能21%以上*3。

针对行为节能的管理，通过部分时间、局部空间的个性化智能控制，例如无人时自动关机、设定温度过高或过低时自动调节，满足舒适性的同时节能20%以上*4。

建筑能耗与碳排占社会总能耗及碳排的21%，其中空调系统能耗占到建筑能耗的49%，而占到中央空调市场份额49.6%的多联机无疑是节能减排的重中之重。MDV多联机重新定义低碳标准，仅一体化弧形换热器的规模化生产，全生命周期合计减排5,984,274吨，带来的减碳效益，按建筑运行每年碳排放约20亿吨计算，可为建筑运行减排0.3%。

为了助力智慧生态及碳中和的实现，美的楼宇科技倡议厂家在相应标准的引导下，推进可行的技术进行减碳变革。多联机领域绿色智慧评价标准的发布，不仅从用户的实际需求出发，提供了用户选用产品的评判性依据；同时也反映了最新科研发展趋势，可以引导行业继续进行多联机产品绿色设计、智慧功能的技术革新，推进产品的迭代升级，从而推动整个空调行业的健康发展。

*1 假设脏堵导致室内机50%风量损失实测结果

*2 假设系统冷媒泄露量达到20%仿真结果

*3 基于实验室实测结果