Portable personal conditioning systems: Transient modeling and system analysis

Abstract The existing Personal Conditioning Systems (PCS) have a limited market potential in spite of their energy savings potential and improved thermal comfort due to a combination of factors like retrofit costs, cooling limited to regions near installation and addition to building heat loads. We propose a novel concept of Portable Personal Conditioning System (PPCS) to address these challenges. PPCS includes a cooling system on an automated platform, which follows occupants to keep them comfortable. Four such cooling systems are presented: a vapor compression system (VCS), a chilled water based system, an ice storage based system and a phase change material storage based system. First-principles-based, transient multi-physics models were constructed for each system using Modelica to gain a more complete understanding of system performance and to quantify performance criteria such as minimum system weight and battery life. The article quantifies the trade-offs from the use of each system and is expected to motivate the development of portable personal cooling devices. System weights range from 19 to 31 kg with the chilled water system being the heaviest. The VCS consumes 40% more battery while delivering 170 W cooling at roughly twice the price of the chilled water system. The ice and phase change material based systems have weights comparable to the VCS and power consumption comparable to that of the chilled water based system.

[1]  Vikrant Aute,et al.  CoilDesigner: a general-purpose simulation and design tool for air-to-refrigerant heat exchangers , 2006 .

[2]  Cheryl A. Farr,et al.  Fabric Selection for a Liquid Cooling Garment , 2006 .

[3]  Bijan Samali,et al.  A review of different strategies for HVAC energy saving , 2014 .

[4]  Thierry S. Nouidui,et al.  Modelica Buildings library , 2014 .

[5]  John Kaiser Calautit,et al.  A novel design of a desiccant rotary wheel for passive ventilation applications , 2016 .

[6]  H. Kretzschmar,et al.  The IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam , 2000 .

[7]  Y. Hwang,et al.  Rechargeable Personal Air Conditioning Device , 2016 .

[8]  Dongmei Pan,et al.  A numerical study on the effects of design/operating parameters of the radiant panel in a radiation-based task air conditioning system on indoor thermal comfort and energy saving for a sleeping environment , 2017 .

[9]  Xiaohua Xia,et al.  Energy-efficient predictive control of indoor thermal comfort and air quality in a direct expansion air conditioning system , 2017 .

[10]  An-Shik Yang,et al.  Investigation of flow and heat transfer around internal channels of an air ventilation vest , 2014 .

[11]  Stuart W. Churchill,et al.  Comprehensive Correlating Equations for Heat, Mass and Momentum Transfer in Fully Developed Flow in Smooth Tubes , 1977 .

[12]  Fred Bauman,et al.  Individual thermal comfort control with desk-mounted and floor-mounted task/ambient conditioning (TAC) systems , 1999 .

[13]  Y. Zhai,et al.  Comfort under personally controlled air movement in warm and humid environments , 2013 .

[14]  Lei Xie,et al.  Modeling of the surface temperature field of a thermoelectric radiant ceiling panel system , 2016 .

[15]  Luisa F. Cabeza,et al.  Simulation-based optimization of PCM melting temperature to improve the energy performance in buildings , 2017 .

[16]  César Martín-Gómez,et al.  Thermoelectric cooling heating unit performance under real conditions , 2017 .

[17]  Shinichi Watanabe,et al.  Thermal evaluation of a chair with fans as an individually controlled system , 2009 .

[18]  Ryozo Ooka,et al.  Exergy analysis of a hybrid ground-source heat pump system , 2017 .

[19]  Christian Kral,et al.  A Modelica Library for Simulation of Elecric Energy Storages , 2011 .

[20]  Pan Xu,et al.  Feasibility of ground coupled heat pumps in office buildings: A China study , 2016 .

[21]  Inge Blom,et al.  LCA-based environmental assessment of the use and maintenance of heating and ventilation systems in Dutch dwellings , 2010 .

[22]  N. Ghaddar,et al.  PCM cooling vest for improving thermal comfort in hot environment , 2016 .

[23]  Reinhard Radermacher,et al.  Design optimization and validation of high-performance heat exchangers using approximation assisted optimization and additive manufacturing , 2017 .

[24]  Hui Zhang,et al.  Air temperature thresholds for indoor comfort and perceived air quality , 2011 .

[25]  Arsen Krikor Melikov,et al.  Human Response to an Individually Controlled Microenvironment , 2007 .

[26]  Faming Wang,et al.  Hybrid cooling clothing to improve thermal comfort of office workers in a hot indoor environment , 2016 .

[27]  Stuart W. Churchill,et al.  A general expression for the correlation of rates of transfer and other phenomena , 1972 .

[28]  Tong Yang,et al.  Characteristic study of a novel compact Solar Thermal Facade (STF) with internally extruded pin-fin flow channel for building integration , 2016 .

[29]  Ruzhu Wang,et al.  Method to design optimal scheme for cold storage air conditioning system , 2002 .

[30]  Gail Brager,et al.  Evolving opportunities for providing thermal comfort , 2015 .

[31]  Ana Paula Melo,et al.  Naturally comfortable and sustainable: Informed design guidance and performance labeling for passive commercial buildings in hot climates , 2016 .

[32]  Weimin Wang,et al.  Field evaluation of advanced controls for the retrofit of packaged air conditioners and heat pumps , 2015 .

[33]  Peter Jones,et al.  A Cell-in-the-Loop Approach to Systems Modelling and Simulation of Energy Storage Systems , 2015 .

[34]  Christian Kral,et al.  Comparison of electrical battery models using a numerically optimized parameterization method , 2011, 2011 IEEE Vehicle Power and Propulsion Conference.

[35]  R. Radermacher,et al.  Transient modeling of a flash tank vapor injection heat pump system – Part I: Model development , 2015 .

[36]  Kamel Ghali,et al.  Evaporative cooler improves transient thermal comfort in chilled ceiling displacement ventilation conditioned space , 2013 .

[37]  Bijan Samali,et al.  Modelling and performance prediction of an integrated central cooling plant for HVAC energy efficiency improvement , 2013 .

[38]  Jianlei Niu,et al.  Experimental study on a chair-based personalized ventilation system , 2007 .

[39]  Kamel Ghali,et al.  Chilled ceiling and displacement ventilation aided with personalized evaporative cooler , 2011 .

[40]  Hui Zhang,et al.  Energy-efficient comfort with a heated/cooled chair: Results from human subject tests , 2015 .

[41]  Da Yan,et al.  Comparative study of the cooling energy performance of variable refrigerant flow systems and variable air volume systems in office buildings , 2016 .

[42]  Pradeep Bansal.  High efficiency novel window air conditioner , 2015 .

[43]  A. D. Flouris,et al.  Design and Control Optimization of Microclimate Liquid Cooling Systems Underneath Protective Clothing , 2006, Annals of Biomedical Engineering.

[44]  Hui Zhang,et al.  Comfort, perceived air quality, and work performance in a low-power task–ambient conditioning system , 2008 .

[45]  Ephraim M Sparrow,et al.  Analysis of melting in the presence of natural convection in the melt region , 1977 .

[46]  Amanda Pertzborn,et al.  Effective design and operation of hybrid ground-source heat pumps: Three case studies , 2011 .

[47]  Kamel Ghali,et al.  Cooling vest with optimized PCM arrangement targeting torso sensitive areas that trigger comfort when cooled for improving human comfort in hot conditions , 2017 .

[48]  A. Faghri,et al.  A numerical analysis of phase-change problems including natural convection , 1990 .

[49]  Daniel A. Dalgo,et al.  Cooling efficiency of a spot-type personalized air-conditioner , 2017 .

[50]  Hui Zhang,et al.  A review of the corrective power of personal comfort systems in non-neutral ambient environments , 2015 .

[51]  Luisa F. Cabeza,et al.  Review on thermal energy storage with phase change: materials, heat transfer analysis and applications , 2003 .

[52]  A. D. Solomon,et al.  Mathematical Modeling Of Melting And Freezing Processes , 1992 .

[53]  Dongmei Pan,et al.  A numerical study on influences of building envelope heat gain on operating performances of a bed-based task/ambient air conditioning (TAC) system in energy saving and thermal comfort , 2017 .

[54]  Pushpam Kumar.  Agriculture (Chapter8) in IPCC, 2007: Climate change 2007: Mitigation of Climate Change. Contribution of Working Group III to the Fourth assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[55]  Tao Yu,et al.  Experimental study on the dynamic performance of a novel system combining natural ventilation with diffuse ceiling inlet and TABS , 2016 .

[56]  S. Aronoff,et al.  Total Workplace Performance: Rethinking The Office Environment , 1995 .

[57]  Hui Zhang,et al.  EXTENDING AIR TEMPERATURE SETPOINTS: SIMULATED ENERGY SAVINGS AND DESIGN CONSIDERATIONS FOR NEW AND RETROFIT BUILDINGS , 2015 .

[58]  Miguel Ángel Campano,et al.  Window design in architecture: Analysis of energy savings for lighting and visual comfort in residential spaces , 2016 .

[59]  W Wim Zeiler,et al.  Personalized conditioning and its impact on thermal comfort and energy performance - A review , 2014 .

[60]  Y. Tao,et al.  Heat Transfer Characteristics of Melting Ice Spheres Under Forced and Mixed Convection , 2002 .

[61]  A. Melikov,et al.  Personalized ventilation: evaluation of different air terminal devices , 2002 .

[62]  Tianyi Chen,et al.  Next-generation HVAC: Prospects for and limitations of desiccant and membrane-based dehumidification and cooling , 2017 .

[63]  Na Luo,et al.  Data analytics and optimization of an ice-based energy storage system for commercial buildings , 2017 .

[64]  Yaoyu Li,et al.  Modelica-Based Dynamic Modeling of a Chilled-Water Cooling Coil , 2010 .

[65]  Fred Bauman,et al.  Field study of the impact of a desktop task/ambient conditioning system in office buildings , 1998 .

[66]  Li Xiaoyan,et al.  Experimental and numerical investigation of discharging process of direct contact thermal energy storage for use in conventional air-conditioning systems , 2017 .