基于地源热泵毛细管辐射空调新风系统特性研究

发布时间：2018-11-11 17:14

【摘要】：地源热泵毛细管辐射空调是温湿度独立控制系统的诸多形式之一。其具有节能环保、热舒适性好、节省空间等优势,因而日益受到青睐。新风系统是辐射空调重要的组成部分,新风不仅需要满足室内人员卫生需求,还承担室内的湿负荷。新风系统的设计是否合理已成为辐射空调能否正常运行的关键。由于辐射空调大都应用在低能耗的建筑中,相比常规空调,新风负荷占空调总负荷的比重更大。相关研究表明,辐射空调的新风负荷约占总负荷的55%-70%,而常规空调的新风负荷仅占总负荷25%-40%。如何降低新风的能耗及如何使新风系统更好配合毛细管辐射末端将是此类空调能否大面积推广的关键所在。本文重点研究了辐射空调的新风量与送风参数的确定方法,不同新风处理方式的特点、能耗及对地埋管换热系统热平衡性的影响。 本文对地源热泵毛细管辐射空调系统的组成、工作原理及优点进行了阐述。并研究了基于办公、客房和住宅三种类型建筑运用辐射空调时的新风量、新风参数的确定方法。 本文建立了冷却除湿系统、转轮除湿系统和溶液除湿系统的能耗模型。从模型的结果可以得到,如果不使用太阳能、地热能或者工业余热、废热等低品位能源而均以高品位的电能满足再生需求的话,转轮除湿系统和溶液除湿系统均产生较高的再生能耗。转轮和溶液除湿系统总能耗分别是冷却除湿系统的1.54倍和1.52倍。 本文研究了不同新风除湿方式对地埋管热平衡性的影响。以南京的一栋住宅建筑为例,计算该建筑采用三种不同新风除湿方式的热平衡率,分析对地埋管热平衡性的影响。计算结果表明,24小时空调运行模式下,冷却除湿系统、转轮除湿系统和溶液除湿系统的热不平衡率分别为52.5%、27%和-6.5%；16小时空调运行模式下,三种除湿系统的热不平衡率为33.5%、0.8%和-46.9%。 本文搭建了冷却除湿新风机组试验平台,分析了新风温度、回风温度变化对机组性能的影响。试验结果表明,随着新风温度的升高,压缩机吸排气压力增大,热泵供热量和COP下降。新风温度每升高1℃,热泵供热量下降2.77%,COP下降2.03%。随着回风温度的下降,压缩机耗功、热泵供热量及COP均下降。回风温度每下降1℃,热泵的供热量下降2.96%,COP下降1.52%。热泵的热回收效率大约在21%左右,热回收效果良好。
[Abstract]:Ground source heat pump capillary radiation air conditioning is one of the many forms of temperature and humidity independent control system. It has the advantages of energy saving and environmental protection, good thermal comfort, space saving and so on. The fresh air system is an important part of the radiation air conditioning. The fresh air not only needs to meet the hygienic needs of indoor personnel, but also bears the indoor wet load. Whether the design of fresh air system is reasonable has become the key to the normal operation of radiation air conditioning. As radiation air conditioning is mostly used in buildings with low energy consumption, the fresh air load accounts for a larger proportion of the total air conditioning load than conventional air conditioning. Related studies show that the fresh air load of radiation air conditioning accounts for 55-70 of the total load, while the fresh air load of conventional air conditioning only accounts for 25-40 percent of the total load. How to reduce the energy consumption of the fresh air and how to make the fresh air system better cooperate with the capillary radiation end will be the key to the popularization of this kind of air conditioning in a large area. This paper focuses on the determination of fresh air volume and air supply parameters of radiation air conditioning, the characteristics of different fresh air treatment methods, the energy consumption and the influence on the heat balance of buried pipe heat transfer system. This paper describes the composition, working principle and advantages of ground source heat pump capillary radiation air conditioning system. This paper also studies the method of determining the fresh air volume and the parameters of fresh air when using radiation air conditioning in three types of buildings: office, guest room and residence. In this paper, the energy consumption models of cooling dehumidification system, runner dehumidification system and solution dehumidification system are established. From the results of the model, if we do not use solar energy, geothermal energy or low-grade energy such as industrial heat, waste heat, and so on, we can all use high-grade electrical energy to meet the demand for regeneration. Both runner dehumidification system and solution dehumidification system produce high regeneration energy consumption. The total energy consumption of runner and solution dehumidification system is 1.54 times and 1.52 times of cooling dehumidification system, respectively. The effects of different fresh air dehumidification methods on the thermal equilibrium of buried pipes are studied in this paper. Taking a residential building in Nanjing as an example, the heat balance rate of three different fresh air dehumidification modes in this building is calculated, and the influence on the thermal equilibrium of buried pipes is analyzed. The results show that the thermal unbalance rates of cooling dehumidification system, runner dehumidification system and solution dehumidification system are 52.5% and -6.5% respectively. Under the 16 hour air conditioning operation mode, the thermal unbalance rate of the three dehumidification systems is 33.50.58% and -46.9% respectively. In this paper, the test platform of cooling and dehumidifying fresh air unit is built, and the influence of fresh air temperature and return air temperature on the performance of the unit is analyzed. The experimental results show that with the increase of fresh air temperature, the suction pressure of compressor increases, the heat supply of heat pump and COP decrease. When the fresh air temperature rises by 1 鈩，

本文编号：2325577