Modeling and environmental applicability of solar solution grading collector/regenerator system with heat recovery

doi:10.11949/j.issn.0438-1157.20170033

Abstract

Abstract:

To improve the collection and regeneration efficiency of strong solution under extreme conditions, this paper reveals a solar grading collector/regenerator method with inter-grade and same-grade heat exchangers. Based on heat and mass balance in the packed reservoir, a model of solar grading collector/regenerator system in which pre-dehumidification solution parameters could be adjusted is established. Numerical simulation shows that there are critical points in regeneration efficiency of grading regeneration under variety of outdoor situations compared with single-stage regeneration. Grading regeneration is preferable to single-stage regeneration while outdoor environmental temperature and relative humidity are above the critical points as well as sun radiation intensity is lower than the critical point. Finally, the applying ranges of grading collector/regenerator system on environmental parameters and solution concentration are comprehensively provided in this paper and it is found that the situations of lower radiation from sun and higher temperature and relatively humidity are beneficial to regenerate solution of high concentration by grading collector/regenerator system.

Key words: grading, regeneration, critical point, simulation, efficiency

摘要：

为了在极端气候条件下提高高浓度溶液的集热再生效率，提出一种带同级热回收和级间热回收的太阳能分级溶液集热再生方法。基于填料储液槽的热质平衡，建立预除湿溶液参数可动态调整的太阳能分级集热再生系统数学模型。数值模拟发现在不同室外环境条件下分级再生和单级再生效率对比存在临界点，室外环境温度和相对湿度高于临界点，太阳辐射辐射强度低于临界点，分级再生优于单级再生。文章最后综合给出分级集热再生的环境和溶液浓度适用范围，发现在低太阳辐射、高温高湿的气候环境下，其对高浓度溶液再生越有利。

关键词: 分级, 再生, 临界点, 模拟, 效率

CLC Number:

TQ028.8

PENG Donggen, LUO Danting, CHENG Xiaosong. Modeling and environmental applicability of solar solution grading collector/regenerator system with heat recovery[J]. CIESC Journal, 2017, 68(8): 3242-3249.

彭冬根, 罗丹婷, 程小松. 热回收型太阳能分级溶液集热/再生系统模型及环境适用性分析[J]. 化工学报, 2017, 68(8): 3242-3249.

References 31

[1]	CHENG Q, ZHANG X S. Review of solar regeneration methods for liquid desiccant air-conditioning system[J]. Energy and Buildings, 2013, 67:426-433.
[2]	MEHTA J R, RANE M V. Liquid desiccant based solar air conditioning system with novel evacuated tube collector as regenerator[J]. Procedia Engineering, 2013, 51:688-693.
[3]	MUN J H, JEON D S, KIM Y L. et al. A study on the regeneration performance characteristics of an internally heated regenerator in a liquid desiccant system[J]. Journal of Mechanical Science and Technology, 2016, 30(3):1343-1349.
[4]	YIN Y G, ZHANG X S, WANG G, et al. Experimental study on a new internally cooled/heated dehumidifier/regenerator of liquid desiccant systems[J]. International Journal of Refrigeration, 2008, 31(5):857-866.
[5]	YIN Y G, ZHANG X S, PENG D G, et al. Model validation and case study on internally cooled/heated dehumidifier/regenerator of liquid desiccant systems[J]. International Journal of Thermal Sciences, 2009, 48(8):1664-1671.
[6]	ELSARRAG E. Evaporation rate of a novel tilted solar liquid desiccant regeneration system[J]. Solar Energy, 2008, 82(7):663-668.
[7]	KAKABAEV A, KHANDURDYEV A, KLYSHCHAEVA O, et al. A large scale solar air conditioning pilot plant and its test results[J]. International Chemical Engineering, 1976, 16(1):60-64.
[8]	COLLIER R K. The analysis and simulation of an open cycle absorption refrigeration system[J]. Solar Energy, 1979, 23:357-366.
[9]	GANDHIDASAN P, AL-FARAYEDHI A A. Solar regeneration of liquid desiccants suitable for humid climates[J]. Energy, 1994, 19(8):831-836.
[10]	GANDHIDASAN P, AL-FARAYEDHI A A. Thermal performance analysis of a partly closed-open solar regenerator[J]. Journal of Solar Energy Engineering, 1995, 117(2):151-153.
[11]	KHALID C S, GANDHIDASAN P, ZUBAIR S M. Exergy analysis of a liquid-desiccant-based, hybrid air-conditioning system[J]. Energy, 1998, 23(1):51-59.
[12]	NELSON D J, WOOD B D. Evaporation rate model for a natural convection glazed collector/regenerator[J]. Journal of Solar Energy Engineering, 1990, 112(1):51-57.
[13]	NELSON D J, WOOD B D. Two-dimensional, analysis and performance of a natural convection glazed collector/regenerator[J]. Solar Engineering, 1987, 2:933-940.
[14]	YANG R, WANG P L. Experimental study for a double-glazed forced-flow solar regenerator[J]. Journal of Solar Energy Engineering, 1998, 120(4):253-259.
[15]	YANG R, WANG P L. A simulation study of performance evaluation of single-glazed and double-glazed collectors/regenerators for an open-cycle absorption solar cooling system[J]. Solar Energy, 2001, 71(4):263-268.
[16]	YANG R, WANG P L. Experimental study of a forced convection solar collector/regenerator for open-cycle absorption cooling[J]. Journal of Solar Energy Engineering, 1994, 116(4):194-199.
[17]	YANG R, WANG P L. The optimum glazing height of a glazed solar collector/regenerator for open-cycle absorption cooling[J]. Energy, 1994, 19(9):925-931.
[18]	YANG R, WANG P L. The effect of heat recovery on the performance of a glazed solar collector/regenerator[J]. Solar Energy, 1995, 54(1):19-24.
[19]	ALIZADEH S, SAMAN W Y. An experimental study of a forced flow solar collector/regenerator using liquid desiccant[J]. Solar Energy, 2002, 73(5):345-362.
[20]	ALIZADEH S, SAMAN W Y. Modeling and performance of a forced flow solar collector/regenerator using liquid desiccant[J]. Solar Energy, 2002, 72(2):143-154.
[21]	KABEEL A E. Augmentation of the performance of solar regenerator of open absorption cooling system[J]. Renewable Energy, 2005, 30(3):327-338.
[22]	GANDHIDASAN P. Simple analysis of a forced flow solar regeneration system[J]. Journal of Energy, 1982, 6(6):436-437.
[23]	GANDHIDASAN P. Thermal performance predictions and sensitivity analysis for a parallel flow solar regenerator[J]. Journal of Solar Energy Engineering, 1983, 105(2):224-229.
[24]	ZEIDAN E B, ALY A A, HAMED A M. Modeling and simulation of solar-powered liquid desiccant regenerator for open absorption cooling cycle[J]. Solar Energy, 2011, 85(11):2977-2986.
[25]	LI Y T, YANG H X. Investigation on solar desiccant dehumidification process for energy conservation of central air-conditioning systems[J]. Applied Thermal Engineering, 2008, 28(10):1118-1126.
[26]	PENG D G, ZHANG X S. Modeling and performance analysis of solar air pretreatment collector/regenerator using liquid desiccant[J]. Renewable Energy, 2009, 34(3):699-705.
[27]	PENG D G, ZHANG X S, YIN Y G. Theoretical storage capacity for solar air pretreatment liquid collector/regenerator[J]. Applied Thermal Engineering, 2008, 28(11/12):1259-1266.
[28]	彭冬根, 张小松. 太阳能空气预处理分级溶液集热再生系统特性[J]. 农业工程学报, 2016, 32(6):242-247. PENG D G, ZHANG X S. Characteristics of solar air-pretreatment solution grading thermal regeneration system[J]. Transactions of the Chinese Society of Agricultural Engineering, 2016, 32(6):242-247.
[29]	PENG D G, ZHANG X S. A modified model of solar collector/regenerator considering effect of the glazing temperature[J]. International Journal of Refrigeration, 2015, 49:151-159.
[30]	LIU X H, JIANG Y, XIA J J, et al. Analytical solutions of coupled heat and mass transfer processes in liquid desiccant air dehumidifier/regenerator[J]. Energy Conversion and Management, 2007, 48(7):2221-2232.
[31]	CONDE M R. Properties of aqueous solutions of lithium and calcium chlorides:formulations for use in air conditioning equipment design[J]. International Journal of Thermal Sciences, 2004, 43(4):367-382.