Performance study of compressive energy absorption refrigeration system based on R124/DMAC mixture

doi:10.16085/j.issn.1000-6613.2016-1922

Abstract

Abstract: Absorption refrigeration can recover industrial waste heat,but cannot effectively utilize waste heat below 100℃.Aiming at the problems of high pressure and temperature in the traditional ammonia absorption refrigeration system,the performance of compressive absorption refrigeration system was simulated with R124/DMAC as working fluids.Operating parameters were studied by changing operating temperatures,pressures and condensing temperatures.Operating temperature and pressure were the major factors influencing system COP,energy loss and efficiency.Compared with the traditional ammonia absorption refrigeration system,the results showed that at the same condensing temperature,the maximum COP of the two working fluid systems was the same.But the new system had a lower pressure of 600kPa (ammonia system of 1100kPa),a lower temperature of 75℃(ammonia system is 100℃).The irreversibility using the new refrigerant and the exergy efficiency were in a reasonable range.The main factors influencing the system of COP,exergy loss and exergy efficiency were pressure,temperature and condensing temperature.

Key words: absorption/compression refrigerator, exergy, thermodynamics, simulation, model

摘要： 吸收式制冷能够利用工业余热进行制冷，但存在不能高效利用100℃以下废热的问题。本文以压缩吸收式制冷系统为研究对象，采用新型制冷工质对R124/DMAC，对不同发生压力、发生温度和冷凝温度下系统性能的变化规律进行研究，并与传统氨/水制冷系统的性能进行比较。结果表明影响系统制冷系数（COP）、（火用）损和（火用）效率的主要因素是发生温度和发生压力，在相同冷凝温度下，R124/DMAC制冷系统的最佳发生压力为600kPa，最佳发生温度为75℃；而氨/水制冷系统的最佳发生压力为1100kPa，最佳发生温度为100℃，采用新型制冷工质对能够有效地利用更低品位的热源进行制冷，同时系统的安全性更高。

关键词: 压缩吸收式制冷, （火用）, 热力学, 仿真, 模型

CLC Number:

TK124

JIA Jiong, WANG Huitao, LIU Fanhan, GE Zhong. Performance study of compressive energy absorption refrigeration system based on R124/DMAC mixture[J]. Chemical Industry and Engineering Progress, 2017, 36(07): 2436-2442.

贾炯, 王辉涛, 刘泛函, 葛众. 基于R124/DMAC为工质的压缩吸收式制冷系统的性能分析[J]. 化工进展, 2017, 36(07): 2436-2442.

References

[1] 禹志强,吴铁晖,吴裕远,等. 氨-水和氨-水-溴化锂在吸收式制冷机中的对比实验研究[J]. 西安交通大学学报,2009,43(3):46-49.YU Z Q,WU T H,WU Y Y,et al. Experimental comparison between ammonia-water and ammonia-water-lithium bromide in absorption chiller[J]. Journal of Xi'an Jiaotong Univerdity,2009,43(3):46-49.
[2] VENTAS R,LECUONA A,ZACARIAS A,et al. Ammonia-lithium nitrate absorption chiller with an integrated low-pressure compression booster cycle for low driving temperatures[J]. Applied Thermal Engineering,2010,30(11/12):1351-1359.
[3] MENG X,ZHENG D,WANG J,et al. Energy saving mechanism analysis of the absorption-compression hybrid refrigeration cycle[J]. Renewable Energy,2013,57(3):43-50.
[4] KANG Y T,HONG H,PARK K S. Performance analysis of advanced hybrid GAX cycle:HGAX[J]. International Journal of Refrigeration,2004,27(4):442-448.
[5] JELINEK M,LEVY A,BORDE I. Performance of a triple-pressure level absorption/compression cycle[J]. Applied Thermal Engineering,2012,42(3):2-5.
[6] BOR D M V D,FERRRIRA C A I,KISS A A. Optimal performance of compression-resorption heat pump systems[J]. Applied Thermal Engineering,2014,65(1/2):219-225.
[7] LOUNISSI D,BOUAZIZ N,KAIROUANI L. An exergetic study of a new hybrid heat pump based on R124/DMAC mixture for solar cooling[J]. International Journal of Exergy,2015,17(4):513-531.
[8] WANG Q,GONG L,WANG J P,et al. A numerical investigation of a diffusion absorption refrigerator operating with the binary refrigerant for low temperature applications[J]. Applied Thermal Engineering,2011,31(10):1763-1769.
[9] ROY S,MAIYA M P. Analysis of pinch point in liquid-vapour heat exchanger of R134a-DMAC vapour absorption refrigeration system[J]. Applied Thermal Engineering,2013,50(2):1619-1626.
[10] ROY S{MAIYA M P. Investigations on R134a-DMAC vapour absorption refrigeration system with add-on components[J]. International Journal of Thermal Sciences,2012,59(9):224-233.
[11] EZZINE N B,GARMA R,BELLAGI A. A numerical investigation of a diffusion-absorption refrigeration cycle based on R124-DMAC mixture for solar cooling[J]. Energy,2010,35(5):1874-1883.
[12] 李星,徐士鸣. 基于R124-DMAC为工质对的余热吸收式制冷[J]. 化工学报,2015,66(5):1883-1890. LI X,XU S M,Absorption refrigeration cycle driven by waste heat using R124-DMAC as working fluids[J]. CIESC Journal,2015,66(5):1883-1890.
[13] CHEN H,GOSWAMI D Y,RAHMAN M M,et al. A supercritical Rankine cycle using zeotropic mixture working fluids for the conversion of low-grade heat into power[J]. Fuel & Energy Abstracts,2011,36(36):549-555.
[14] YIDIZ A,ERSOZ M A. Energy and exergy analyses of the diffusion absorption refrigeration system[J]. Energy,2013,60(7):407-415.
[15] TCHANCHE B F,PAPADAKIS G,LAMBRINOS G,et al. Fluid selection for a low-temperature solar organic Rankine cycle[J]. Applied Thermal Engineering,2009,29(11/12):2468-2476.
[16] TALBI M M,AGNEW B. Exergy analysis:an absorption refrigerator using lithium bromide and water as the working fluids[J]. Applied Thermal Engineering,2000,20(7):619-630.
[17] ROSEN M A,IBRAHIM D. Exergy analysis of waste emissions[J]. International Journal of Energy Research,1999,23(23):1153-1163.
[18] 刘强,段远源,宋鸿伟. 生物质直燃有机朗肯循环热电联产系统的热力性能分析[J]. 中国电机工程学报,2013,33(26):60-67. LIU Q,DUAN Y Y,SONG H W. Thermal performance analysis of a biomass-fired organic Rankine cycle[J]. Proceedings of the CSEE,2013,33(26):60-67.
[19] ÇAKIR U,ÇOMAKL K,ÖMER Ç,et al. An experimental exergetic comparison of four different heat pump systems working at same conditions:as air to air,air to water,water to water and water to air[J]. Energy,2013,58(3):210-219.
[20] CHAO H,CHAO L,ZHOU M,et al. A new selection principle of working fluids for subcritical organic Rankine cycle coupling with different heat sources[J]. Energy,2014,68(8):283-291.
[21] HAN X H,WANG S K,HE W,et al. Experimental investigations on the pumping performance of bubble pumps with organic solutions[J]. Applied Thermal Engineering,2015,86:43-48.
[22] 许心皓,段远源. CPA方程结合RG理论计算甲醇、水、氨的性质[J]. 清华大学学报(自然科学版),2011,51(5):677-680. XU X X,DUAN Y Y. Thermodynamic properties of methanol,water and ammonia predicted using CPA EOS+renormalization group theory[J]. J. Tsinghua Univ.(Sci. & Tech.),2011,51(5):677-680.