双冷源新风机组性能特性研究及仿真

发布时间：2018-01-29 14:12

本文关键词： 双冷源新风机组运行策略仿真负荷比例排风热回收　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：传统空调系统中夏季室内热湿负荷由单一冷源承担,造成热湿联合处理的能量损失、热湿比不匹配和室内空气品质不佳等问题。而温湿度独立控制空调系统越来越广泛地被用于民用建筑和工业建筑中,该空调系统中的新风系统承担着室内全部湿负荷。因此有必要研究双冷源新风机组的性能特性,为新风机组的设计开发提供支持。首先,本文研究了温湿度独立控制空调系统新风运行策略。基于工业通风中的全面通风方程,类比提出了室内空气含湿量动态模型。当使用温湿度独立控制空调系统的办公建筑室内无办公人员时,提出将新风渗透湿负荷作为房间湿负荷的主要来源。并将该模型用于除湿新风量和预除湿时间的确定,得出不同送风含湿量下适宜的人均新风量和新风预除湿时间,为温湿度独立控制空调系统中的辐射空调系统间歇节能运行提供参考依据。其次,建立了双冷源新风机组仿真平台。双冷源新风机组建模仿真的主要研究对象是空气源热泵系统、前级表冷器和离心风机。对压缩机、冷凝器、膨胀阀、蒸发器和前级表冷器等主要部件进行建模。基于建立的仿真程序,分别对表冷器和蒸发器进行了仿真计算,研究机组变工况运行特性。计算比较了双冷源新风机组和单冷源新风机组整机能耗和整机COP,得出双冷源新风机组整机能耗低于单冷源新风机组,整机COP高于单冷源新风机组。研究了双冷源新风机组中表冷器和蒸发器负荷分配比例,得出当表冷器与蒸发器所承担的负荷比例为7：3时,能实现新风机组整机能耗最低,COP最高。最后,对双冷源新风机组的冬季排风热回收工况进行实验研究,分析了新风温度和回风温度对新风机组工作性能的影响。计算比较了机组在冬季排风热回收工况和常规空气源热泵冬季工况的热泵供热量和COP,分析了机组的热回收效率。
[Abstract]:In the traditional air conditioning system, the indoor heat and humidity load in summer is borne by a single cold source, which results in the energy loss of combined heat and humidity treatment. Problems such as mismatch of heat / humidity ratio and poor indoor air quality, and air conditioning systems with independent temperature and humidity control are more and more widely used in civil and industrial buildings. The fresh air system in the air conditioning system bears all the indoor wet load. So it is necessary to study the performance characteristics of the double cold source fresh air unit to provide support for the design and development of the fresh air unit. In this paper, the operation strategy of fresh air in air conditioning system with independent control of temperature and humidity is studied, based on the overall ventilation equation in industrial ventilation. The dynamic model of indoor air moisture content is put forward by analogy. When there is no office personnel in office buildings with air conditioning system controlled by temperature and humidity independently. It is proposed that the wet load of fresh air permeate as the main source of room wet load, and the model is used to determine the fresh air volume and pre-dehumidification time of dehumidification. The suitable per capita fresh air volume and pre-dehumidification time of fresh air under different moisture content of air supply can provide a reference for the intermittent energy saving operation of radiation air conditioning system in the independent control of temperature and humidity. The main research objects of modeling and simulation of double cold source fresh air unit are air source heat pump system, front stage surface cooler and centrifugal fan, compressor, condenser, expansion valve. Based on the established simulation program, the simulation of the evaporator and the evaporator is carried out respectively. The energy consumption and COPof the dual cold source fresh air unit and the single cooling source fresh air unit are calculated and compared, and the result shows that the energy consumption of the double cold source fresh air unit is lower than that of the single cold source fresh air unit. The COP of the whole machine is higher than that of the fresh air unit with single cooling source. The load distribution ratio of the surface cooler and the evaporator in the double cold source fresh air unit is studied, and it is concluded that when the load ratio between the surface cooler and the evaporator is 7: 3. The energy consumption of the whole unit is the lowest and the cop is the highest. Finally, the experimental study on the winter exhaust heat recovery condition of the double cold source fresh air unit is carried out. The influence of fresh air temperature and return air temperature on the performance of fresh air unit is analyzed. The heat supply and COP of heat pump in winter exhaust heat recovery and conventional air source heat pump in winter are calculated and compared. The heat recovery efficiency of the unit is analyzed.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU83

【参考文献】