三种不同冷凝热回收方式下空调系统性能研究

发布时间：2018-05-16 22:08

  本文选题：冷凝热回收 + 热泵空调器　； 参考：《天津商业大学》2013年硕士论文

【摘要】：本文着眼于保护环境与节约能源，对常规空调进行冷凝热回收研究，冷凝热回收系统最大特点是能够在夏季向室内供冷的同时回收冷凝热制取生活热水，这样不仅缓解了夏季热泵空调器在制冷时对室外环境的热污染问题和能源的浪费问题，而且可以节约大量的加热生活热水的一次能源。冷凝热回收系统有多种形式，本文主要针对循环加热式冷凝热回收系统、静态加热式冷凝热回收系统和相变蓄热式冷凝热回收系统进行冷凝热回收的研究。综合空气源热泵空调器、空气源热泵热水器以及相变储能技术搭建了空气源热泵多功能实验台，该实验台能实现对循环加热式冷凝热回收、静态加热式冷凝热回收和相变蓄热式冷凝热回收做单独的性能研究。每种冷凝热回收形式又可运行单独制冷模式、单独制热模式、单独制热水模式以及冷凝热回收模式。冷凝热回收模式按热回收能力又可分为全部冷凝热回收、部分冷凝热回收和复合冷凝热回收。 实验对不同类型冷凝热回收系统在夏季工况运行时的特性进行了实验研究，分析并比较了各系统制冷能效比、制热性能系数以及冷凝热回收模式下的综合性能系数和热回收率等。通过实验研究得到如下结论： 1）冷凝热回收系统在运行单独制冷模式时，制冷能效比EER为2.4，在部分冷凝热回收模式下，循环加热式冷凝热回收平均综合能效系数为5.1，是单独制冷时的2.12倍；静态加热式冷凝热回收平均综合性能系数为4.9，是单独制冷时的2.04倍；相变蓄热式冷凝热回收平均综合能效系数为2.9，为单独制冷时的1.2倍。 2）当运行部分冷凝热回收模式时，循环加热式冷凝热回收平均热回收率为42%，在运行过程中减少了系统42%的冷凝热排放量；静态加热式冷凝热回收平均热回收率为28%；相变蓄热式冷凝热回收平均热回收率为15%。 3）当运行部分冷凝热回收模式时，循环加热式冷凝热回收需要120分钟将200L热水从20℃加热到50℃；静态加热式冷凝热回收需要155分钟将200L热水从20℃加热到50℃。 对冷凝热回收装置内蓄热介质换热特性建立数学和物理模型，开展温度及速度的变化及分布情况的模拟研究，通过对三种不同系统形式的冷凝热回收装置蓄热介质随加热时间的变化进行模拟研究得到如下结论： 1）在蓄热过程中，循环加热式冷凝热回收的全部冷凝热回收模式时，蓄热水箱水温有2-3℃的温度分层出现；静态加热式冷凝热回收的全部冷凝热回收模式时，蓄热水箱水温有3-4℃的温度分层；相变蓄热冷凝热回收的部分冷凝热回收模式时，相变箱上部温度较高下部较低，当运行4小时后相变箱上层温度已经达到58℃时，下层石蜡温度仅为42℃。 2）模拟将200L20℃的水加热到50℃时，循环加热式冷凝热回收需要加热60分钟，实验值为60分钟；静态加热式冷凝热回收需要80分钟，实验值为80分钟；对石蜡蓄热过程进行模拟，石蜡的融化过程与实验所观察相同，即靠近盘管的部分先融化相变，接着是上层石蜡部分,模拟4小时后当上层石蜡全部相变后，下部石蜡温度仅为42.5℃；实验加热4小时，上层温度为72℃，，下部温度仅为42.3℃。
[Abstract]:The invention aims at protecting the environment and saving energy , and carrying out condensation heat recovery research on a conventional air conditioner .

In this paper , the characteristics of different types of condensation heat recovery system in summer working condition are studied , and the performance ratio , coefficient of thermal performance and the recovery of heat recovery are compared . The results are as follows :

1 ) When the condensing heat recovery system is operating in a single cooling mode , the energy efficiency ratio of refrigeration is 2.4 , and in part of the condensation heat recovery mode , the average comprehensive energy efficiency coefficient of the circulating heating type condensing heat recovery system is 5.1 , which is 2.12 times of the individual refrigeration ;
The average comprehensive energy coefficient of the static heating type condensation heat recovery is 4.9 , which is 2.04 times that of the individual refrigeration .
The average comprehensive energy efficiency coefficient of phase change regenerative condensing heat recovery is 2.9 , which is 1.2 times of the individual refrigeration .

2 ) When operating part of the condensing heat recovery mode , the average recovery of heat recovery of the circulating heating type condensation heat recovery is 42 % , and the condensing heat discharge amount of the system is reduced by 42 % during operation ;
The average recovery of heat recovery was 28 % .
The average recovery of heat recovery for phase change regenerative condensation heat recovery is 15 % .

3 ) when the operating part of the condensing heat recovery mode , the circulating heating type condensation heat recovery needs 120 minutes to heat the 200L hot water from 20 DEG C to 50 DEG C ;
The static heating type condensation heat recovery requires 155 minutes to heat 200 L of hot water from 20.degree . C . to 50.degree . C .

The mathematical and physical models are established for the heat transfer characteristics of the heat storage medium in the condensation heat recovery device , and the simulation research on the change and distribution of the temperature and speed is carried out , and the simulation research on the heat storage medium of the condensing heat recovery device in the form of three different systems is carried out with the change of the heating time to obtain the following conclusions :

1 ) during the heat accumulation process , when all the condensing heat recovery modes of the circulating heating type condensation heat recovery occur , the temperature of the water temperature of the heat storage tank is stratified by the temperature of 2 - 3 DEG C ;
when all the condensing heat recovery modes of the static heating type condensation heat recovery , the water temperature of the heat storage tank is layered at a temperature of 3 - 4 DEG C ;
The temperature of the upper part of the phase change box is lower than the upper part of the phase change box when the partial condensation heat recovery mode of the phase change heat storage condensation heat recovery is low , and when the temperature of the upper layer of the phase change box reaches 58 DEG C after 4 hours of operation , the temperature of the lower layer paraffin is only 42 DEG C .

2 ) heating the water at 200L20 & deg ; C to 50 & deg ; C , heating for 60 minutes under cyclic heating type condensation heat recovery , and testing the experimental value for 60 minutes ;
the static heating type condensation heat recovery needs 80 minutes , and the experimental value is 80 minutes ;
The paraffin wax heat accumulation process was simulated . The melting process of paraffin was the same as that observed in the experiment , that is , the part of the coil close to the coil was melted first , then it was the upper paraffin section . After 4 hours of simulation , the temperature of the lower paraffin was only 42.5 鈩

本文编号：1898608