Research and applications of liquid-to-air membrane energy exchangers in building HVAC systems at University of Saskatchewan: A review

Energy recovery from exhaust air to condition or partly condition outdoor ventilation air has been proved to be an effective method for building energy conservation and is now required in many building Codes and ASHRAE Standards for most commercial buildings. Nonetheless, existing energy recovery ventilators encounter some challenges in practical applications, such as: low exchanger effectiveness and system COP, requirement of adjacent air streams for most exchangers, elimination of cross-contamination between supply and exhaust air, and the avoidance of downstream airborne drift of liquid exchanger coupling fluids. A new kind of liquid-to-air membrane energy exchanger (LAMEE) has been under development in the Thermal Science Laboratory at the University of Saskatchewan, and progress has been made on the research and applications of LAMEEs in heating, ventilation and air-conditioning (HVAC) systems in the past 10 years. The present paper gives a summary of this research. Specifically, properties and selections of semi-permeable membranes and desiccant solutions were studied. Design, steady-state and transient performance of single LAMEEs were investigated. Much attention has also been paid to energy and economic performance of run-around membrane energy exchanger (RAMEE) systems (typically consisting of two LAMEEs) for passive energy recovery in building HVAC systems. Related control and optimization methods for RAMEEs have been developed for some configurations. The application of LAMEEs in liquid desiccant air-conditioning systems as active dehumidifiers and regenerators has been studied.

[1]  Blake Erb.  Run-around membrane energy exchanger performance and operational control strategies , 2009 .

[2]  Cai-Hang Liang,et al.  Performance analysis of a direct expansion air dehumidification system combined with membrane-based total heat recovery , 2010 .

[3]  Carey J. Simonson,et al.  Analytical model based performance evaluation, sizing and coupling flow optimization of liquid desiccant run-around membrane energy exchanger systems , 2013 .

[4]  K. Y. Qu,et al.  Heat and mass transfer model of cross flow liquid desiccant air dehumidifier/regenerator , 2007 .

[5]  Mohammad Rasouli,et al.  Uncertainties in energy and economic performance of HVAC systems and energy recovery ventilators due to uncertainties in building and HVAC parameters , 2013 .

[6]  R. Besant,et al.  Transient behavior of run-around heat and moisture exchanger system. Part І: Model formulation and verification , 2009 .

[7]  Fu Xiao,et al.  Control performance of a dedicated outdoor air system adopting liquid desiccant dehumidification , 2011 .

[8]  Haisheng Fan,et al.  Performance of a Run-Around System for HVAC Heat and Moisture Transfer Applications Using Cross-Flow Plate Exchangers Coupled with Aqueous Lithium Bromide , 2006 .

[9]  K. Daou,et al.  Desiccant cooling air conditioning : a review , 2006 .

[10]  Omar M. Al-Rabghi,et al.  Proposed energy-efficient air-conditioning system using liquid desiccant , 1996 .

[11]  C. J. Simonson,et al.  Part-load performance of energy wheels: Part 1 -- Wheel speed control , 2000 .

[12]  D. Goswami,et al.  Study of an aqueous lithium chloride desiccant system: air dehumidification and desiccant regeneration , 2002 .

[13]  R. Besant,et al.  Steady-state performance of a run-around membrane energy exchanger (RAMEE) for a range of outdoor air conditions , 2011 .

[14]  David Beriault.  Run-Around Membrane Energy Exchanger Prototype 4 Design and Laboratory Testing , 2011 .

[15]  R. W. Besant,et al.  Air-to-Air Energy Recovery , 2000 .

[16]  Borong Lin,et al.  Combined cogeneration and liquid-desiccant system applied in a demonstration building , 2004 .

[17]  Carey J. Simonson,et al.  Air-to-air exchangers , 2003 .

[18]  Luis Pérez-Lombard,et al.  A review on buildings energy consumption information , 2008 .

[19]  Mohammad Rasouli,et al.  Applicability and optimum control strategy of energy recovery ventilators in different climatic conditions , 2010 .

[20]  Ruzhu Wang,et al.  Development of a novel two-stage liquid desiccant dehumidification system assisted by CaCl2 solution using exergy analysis method , 2010 .

[21]  M. Afshin.  Selection of the liquid desiccant in a run-around membrane energy exchanger , 2010 .

[22]  Carey J. Simonson,et al.  Performance analysis of a membrane liquid desiccant air-conditioning system , 2013 .

[23]  Omar M. Al-Rabghi,et al.  Parametric study of an energy efficient air conditioning system using liquid desiccant , 1998 .

[24]  L. Mei,et al.  A technical review on use of liquid-desiccant dehumidification for air-conditioning application , 2008 .

[25]  Ruzhu Wang,et al.  Use of liquid desiccant cooling to improve the performance of vapor compression air conditioning , 2001 .

[26]  Jianjun Xia,et al.  Performance analysis on the internally cooled dehumidifier using liquid desiccant , 2009 .

[27]  Carey J. Simonson,et al.  The Effect of Membrane Deflections on Flow Rate in Crossflow Air-to-Air Exchangers , 2008 .

[28]  Stanley A. Mumma,et al.  Practical thermal performance correlations for molecular sieve and silica gel loaded enthalpy wheels , 2005 .

[29]  Carey J. Simonson,et al.  Transient behavior of run-around heat and moisture exchanger system. Part IІ: Sensitivity studies for a range of initial conditions , 2009 .

[30]  Chengqin Ren,et al.  Simulation and analysis of a novel liquid desiccant air-conditioning system. , 2009 .

[31]  Li-Zhi Zhang.  An Analytical Solution to Heat and Mass Transfer in Hollow Fiber Membrane Contactors for Liquid Desiccant Air Dehumidification , 2011 .

[32]  Carey J. Simonson,et al.  Application of neural networks to predict the steady state performance of a Run-Around Membrane Energy Exchanger , 2012 .

[33]  Carey J. Simonson,et al.  The elastic and moisture transfer properties of polyethylene and polypropylene membranes for use in liquid-to-air energy exchangers , 2007 .

[34]  Mohammad Rasouli.  Building energy simulation of a Run-Around Membrane Energy Exchanger (RAMEE) , 2010 .

[35]  N. Lior.  Sustainable energy development (May 2011) with some game-changers , 2012 .

[36]  Carey J. Simonson,et al.  +Transient characteristics of a liquid-to-air membrane energy exchanger (LAMEE) experimental data with correlations , 2012 .

[37]  H. F. Zhang,et al.  Numerical simulation and theoretical analysis of heat and mass transfer in a cross flow liquid desiccant air dehumidifier packed with honeycomb paper , 2004 .

[38]  Jianlei Niu,et al.  Energy requirements for conditioning fresh air and the long-term savings with a membrane-based energy recovery ventilator in Hong Kong , 2001 .

[39]  Ruzhu Wang,et al.  Performance of energy recovery ventilator with various weathers and temperature set-points , 2007 .

[40]  Carey J. Simonson,et al.  Performance testing of a counter-cross-flow run-around membrane energy exchanger (RAMEE) system for HVAC applications , 2010 .

[41]  Xiaosong Zhang,et al.  Experimental study on a new internally cooled/heated dehumidifier/regenerator of liquid desiccant systems , 2008 .

[42]  Carey J. Simonson,et al.  Application of neural networks to predict the transient performance of a Run-Around Membrane Energy Exchanger for yearly non-stop operation , 2012 .

[43]  R. Besant,et al.  Energy wheel effectiveness: part I—development of dimensionless groups , 1999 .