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Two Stage Regeneration of Liquid Desiccant Using Solar Energy for Fresh Air Dehumidification System

机译：太阳能除湿剂的两阶段再生，用于新鲜空气除湿系统

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Energy for all and control of greenhouse gas emissions are two contrary goals to be achieved and thus the solution needs a paradigm shift. Energy demand for air conditioning is significant, so there is urgent need to diversify the sources of energy for the same. Liquid desiccant (LD) based air conditioning system is an important alternative technology for air conditioning. This technology is very promising because it is adaptable to renewable sources of energy like solar energy and has valuable feature of high density energy storage at near ambient conditions. Low COP, high parasitic power consumption, corrosion and longer paybacks are the challenges against acceptance of this technology. Certain measures like two stage regeneration, low flow rate of LD and air and higher regeneration temperatures can address above issues. Due to hardware limitations, most prototypes in literature lack one or more of the above features. In present work, a novel heat pipe based evacuated tube solar collector, ETC, developed at the Heat Pump Laboratory at IIT Bombay, HPL_IITB, is used as high temperature regenerator, HTR. HTR regenerates LD to an intermediate concentration. A separator at the outlet of the HTR separates and redirects the steam to the low temperature regenerator, LTR for enabling further regeneration of LD. High LD, aqueous solution of KCOOH, concentration change allowed use of low solution flow rate which was catered to using a 40 W pump. LTR is a rotating disk type diabetic contacting device where steam from the HTR heats the LD as it regenerates into a small ambient air stream used as the scavenging air. High surface density, lower pressure drop and low flow rate of air through LTR are some of the salient features of this device. A prototype two stage LD regeneration subsystem for 3 TR solar fresh air dehumidification system is fabricated installed and tested at HPL_IITB. During low solar insolation, the system can be operated as a single stage regeneration system. Single stage dehumidification COP of around 0.86 and two stage dehumidification COP of 1.03 was recorded during initial trials. The COP can be further improved by running the system at near design flow rates. The improvement of effectiveness of solution heat exchangers and reducing flow rate of air through LTR can help to achieve COP exceeding 1.5 for Mumbai, India outdoor design conditions. The system developed in current work certainly has potential to provide clean and highly energy efficient solution for fresh air dehumidification.
机译：人人享有能源和控制温室气体排放是要实现的两个相反目标，因此解决方案需要进行范式转变。空调的能源需求很大，因此迫切需要使能源多样化。基于液体干燥剂（LD）的空调系统是空调的重要替代技术。该技术非常有前途，因为它适用于太阳能等可再生能源，并具有在接近环境条件下高密度储能的宝贵特征。低COP，高寄生功耗，腐蚀和较长的投资回收期是接受该技术的挑战。某些措施，例如两阶段再生，LD和空气的低流速以及较高的再生温度，可以解决上述问题。由于硬件限制，文献中的大多数原型都缺少上述一个或多个功能。在当前的工作中，由孟买IIT孟买热泵实验室开发的新型基于热管的真空管太阳能集热器ETC被用作高温再生器HTR。 HTR将LD再生至中等浓度。 HTR出口处的分离器将蒸汽分离并重新引导至低温再生器LTR，以实现LD的进一步再生。高LD，KCOOH水溶液，浓度变化允许使用低溶液流速，该流速可通过40 W泵来满足。 LTR是一种转盘式糖尿病接触设备，其中HTR产生的蒸汽在将LD再生成小的周围空气流（用作扫气）时，将LD加热。高表面密度，较低的压降和通过LTR的空气流速低是该设备的一些显着特征。在HPL_IITB上安装并测试了用于3 TR太阳新鲜空气除湿系统的原型两阶段LD再生子系统。在低日照期间，该系统可以作为单级再生系统运行。在初始试验期间，记录的单级除湿COP约为0.86，两级除湿COP为1.03。通过以接近设计的流速运行系统可以进一步提高COP。在印度孟买的室外设计条件下，解决方案热交换器效率的提高和通过LTR的空气流量的减少可以帮助使COP超过1.5。当前工作中开发的系统无疑具有为新鲜空气除湿提供清洁和高能效解决方案的潜力。

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