全空气一次回风空调系统改造探讨

Discussions on the retrofit of primary return air of all-air air-conditioning system

为克服传统全空气一次回风空调系统中组合式空调机组露点送风或再热送风及温湿度耦合处理的缺点,本文提出全空气一次回风空调系统中的新风、回风分开处理方案。基于一级泵空调冷水系统(冷源侧定流量末端变流量),对系统主要部件进行了选型,分析了各方案的节能性、全寿命周期成本。结果表明:全空气一次回风空调系统中的新风、回风分开处理,不需消耗再热量就可满足室内的温度、湿度,且可实现温度、湿度独立控制;各方案的最优顺序为方案1a、方案3、方案2、方案1b。

In the traditional primary return air of all-air air conditioning system, the central station air handling units handle temperature and humidity dependently and supply air at the dew point or a certain temperature by reheating. In order to overcome the short- comings, this paper proposes the handling of fresh air and return air separately. Based on primary pump chilled water system （constant flow distribution of the cold source side and variable flow distribution of the terminal side）, the main components were selected, the energy saving and the whole life cycle cost of the scheme were analyzed. The results show that： by handling fresh air and return air separately, the indoor temperature and humidity can be satisfied without reheating, the temperature and humidity can be controlled inde- pendently- the optimal sequence was scheme la, scheme 3, scheme 2, scheme lb.