Assessing overall building energy performance of a large population of residential single-family homes using limited field data

Building energy simulation plays a significant role in building design and retrofit. Most applications deal with individual buildings which allow for the specification of detailed model inputs. However, building energy simulation can be a powerful tool for assessing energy performance even when comprehensive building characteristics are unavailable. In this study, limited field data were collected on randomly selected new homes in eight US states with a goal of evaluating energy code compliance and energy savings potential. The limited data do not allow the derivation of comprehensive model inputs for each individual home sampled, let alone for the entire unknown residential construction stock. Therefore, we used prototype buildings to construct a large number of models and utilized bootstrap sampling to draw inputs from the limited data. This research demonstrates that overall energy performance of a large population of new homes can be assessed by the novel framework, given limited data.     

消除高压加热器正常疏水管道振动的改造技术

某大型火电机组的高压加热器（高加）正常疏水管路布置不合理,多次出现疏水管路振动,危及设备安全。根据高加正常疏水管路的实际布置位置进行了改造,机组启动初期利用静压差和凝汽器的真空排除正常疏水管路的积水,彻底消除了管道振动,杜绝因振动造成的设备损坏事故。新建机组可以按照无低点、无U型管的设计方案进行优化设计,可以从根本上消除因级间差压小造成的管道振动。