地板送风室内温度分布预测模型

为了研究地板送风方式下有冷却壁面的房间的室内温度特性,本文对常用的多区热质平衡模型作了些修改.修改后的多区热质平衡模型包括3个模块,即壁面流模块、热羽流模块和热移动模块.该模型综合了墙体热传导、壁面对流热交换以及内部控制体之间的对流热交换过程.并通过典型实验验证了该区域模型的可靠性.研究表明:(1)室内外温差越大,壁面下降流越显著且流量越大;(2)下降流影响房间内温度分布且破坏了地板送风房间的温度分层特性;(3)预测值与实验值有着良好的一致性,因此该模型可用来预测具有冷却壁面的地板送风房间温度分布.

A Prediction Model of Temperature Distribution in Chilled Wall Office with Underfloor System

In order to study the indoor air temperature characteristics of a chilled wall space with underfloor air supply,This paper made some modifications to the conventional multi-zonal model.The modified multi-zonal model had three parts,i.e.a wall flow module,a plume flow module and a heat moving module.The modified model took into account not only the coupled heat transfer of conduction,convection and radiation,but also the heat convection between each zone caused by temperature difference and airflow.The full scale experiments were conducted,which validated the reliability of the zone model.The study results showed:(1) the bigger the temperature difference between indoor and outdoor air,the more obvious and more flux of the drop flow;(2)the drop flow influenced the room temperature distribution and could even destroy the indoor temperature delamination;(3)the prediction values agreed well with the test values,and the modified model could be utilized completely to predict the air-temperature distribution in a chilled wall room with underfloor system.