Analysis of solar desiccant cooling system for an institutional building in subtropical Queensland, Australia

Institutional buildings contain different types of functional spaces which require different types of heating, ventilating and air conditioning (HVAC) systems. In addition, institutional buildings should be designed to maintain an optimal indoor comfort condition with minimal energy consumption and minimal negative environmental impact. Recently there has been a significant interest in implementing desiccant cooling technologies within institutional buildings. Solar desiccant cooling systems are reliable in performance, environmentally friendly and capable of improving indoor air quality at a lower cost. In this study, a solar desiccant cooling system for an institutional building in subtropical Queensland (Australia) is assessed using TRNSYS 16 software. This system has been designed and installed at the Rockhampton campus of Central Queensland University. The system's technical performance, economic analysis, energy savings, and avoided gas emission are quantified in reference to a conventional HVAC system under the influence of Rockhampton's typical meteorological year. The technical and economic parameters that are used to assess the system's viability are: coefficient of performance (COP), solar fraction, life cycle analysis, payback period, present worth factor and the avoided gas emission. Results showed that, the installed cooling system at Central Queensland University which consists of 10m2 of solar collectors and a 0.400m3 of hot water storage tank, achieved a 0.7 COP and 22% of solar fraction during the cooling season. These values can be boosted to 1.2 COP and 69% respectively if 20m2 of evacuated tube collector's area and 1.5m3 of solar hot water storage volume are installed.

[1]  I. Eames,et al.  A review of adsorbents and adsorbates in solid–vapour adsorption heat pump systems , 1998 .

[2]  Wasim Saman,et al.  An experimental study of a forced flow solar collector/regenerator using liquid desiccant , 2002 .

[3]  V. A. Baum,et al.  Efficiency of a solar cooler with an open flat solution regenerator , 1972 .

[4]  N. Enteria,et al.  The role of the thermally activated desiccant cooling technologies in the issue of energy and environment , 2011 .

[5]  A. Bal,et al.  Fungal contamination of air conditioning units in operating theatres in India. , 2005, The Journal of hospital infection.

[6]  G. Laschewski,et al.  The perceived temperature – a versatile index for the assessment of the human thermal environment. Part A: scientific basics , 2011, International Journal of Biometeorology.

[7]  Standard Ashrae.  Thermal Environmental Conditions for Human Occupancy , 1992 .

[8]  Takao Kashiwagi,et al.  Solar radiation for sorption cooling in Australiasia , 2001 .

[9]  Francesco Minichiello,et al.  Desiccant HVAC systems for commercial buildings , 2002 .

[10]  R. Simmons,et al.  Fungal colonization of air filters from hospitals. , 1997, American Industrial Hygiene Association journal.

[11]  Yanjun Dai,et al.  Study of a solar powered solid adsorption–desiccant cooling system used for grain storage , 2002 .

[12]  M. Goldsworthy,et al.  Optimisation of a desiccant cooling system design with indirect evaporative cooler , 2011 .

[13]  Clive B. Beggs,et al.  The use of solar desiccant cooling in the UK: a feasibility study , 2002 .

[14]  Ye Yao,et al.  Energy consumption analysis on a dedicated outdoor air system with rotary desiccant wheel , 2007, Energy.

[15]  G. R. Thorpe,et al.  The performance of a solar-regenerated open-cycle desiccant bed grain cooling system , 1991 .

[16]  Francisco J. Batlles,et al.  Renewable energy solutions for building cooling, heating and power system installed in an institutional building: Case study in southern Spain , 2013 .

[17]  Paul Kohlenbach,et al.  Indoor temperature variations resulting from solar desiccant cooling in a building without thermal backup , 2009 .

[18]  Shahab Alizadeh,et al.  Performance of a solar liquid desiccant air conditioner : An experimental and theoretical approach , 2008 .

[19]  Philip Davies,et al.  Modelling and experimental verification of a solar-powered liquid desiccant cooling system for greenhouse food production in hot climates , 2012 .

[20]  Georgios A. Florides,et al.  Modelling and simulation of an absorption solar cooling system for Cyprus , 2002 .

[21]  Theocharis Tsoutsos,et al.  Design of a solar absorption cooling system in a Greek hospital , 2010 .

[22]  Mohammad. Rasul,et al.  Review on Renewable Energy Potential in Australian Subtropical Region (Central and North Queensland) , 2011 .

[23]  Mohammad Masud Kamal. Khan,et al.  Techno-economic simulation and optimization of residential grid-connected PV system for the Queensland climate , 2012 .

[24]  W. Beckman,et al.  Solar Engineering of Thermal Processes , 1985 .

[25]  Mohammad Masud Kamal. Khan,et al.  An overview of solar assisted air conditioning in Queensland's subtropical regions, Australia , 2013 .

[26]  Ruzhu Wang,et al.  Case study and theoretical analysis of a solar driven two-stage rotary desiccant cooling system assisted by vapor compression air-conditioning , 2011 .

[27]  A. Kakabaev,et al.  Absorption solar refrigeration unit with open regeneration of solution , 1969 .

[28]  Hans-Martin Henning,et al.  Solar assisted air conditioning of buildings – an overview , 2004 .

[29]  Palanichamy Gandhidasan.  A simplified model for air dehumidification with liquid desiccant , 2004 .

[30]  Katrin Zass,et al.  Influence of store dimensions and auxiliary volume configuration on the performance of medium-sized solar combisystems , 2010 .