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由西北五省（区）暖通空调、热能动力联合会主办的’９９西北五省（区）暖通空调、热能动力学术年会于１９９９年７月１２～１４日在青海省西宁市召开。来自西北五省（区）的６４名会员代表和全国３０个生产厂家代表共计１２０人参加了大会。大会围绕着“节约能源、保护环境”?
The 1999 Northwestern Five Provinces (District) HVAC, Thermal Energy Academic Annual Conference organized by the five provinces (districts) of the Northwest China (Henan Province) was held in Xining City, Qinghai Province from July 12th to 14th, 1999. Sixty-four member representatives from five provinces (districts) in the northwest and representatives from 30 manufacturers across the country attended the conference. The conference centered around “saving energy and protecting the environment”?