The use of solar desiccant cooling in the UK: a feasibility study

Halliday, Sandy; Beggs, Clive; Sleigh, Andrew

doi:10.1016/s1359-4311(02)00052-2

Cited by 99 publications

(26 citation statements)

References 5 publications

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“…The advantages are a potential to use low grade waste heat at temperatures of less than 60°C and operation at atmospheric pressure. Although extensive work has been carried out on liquid desiccant air conditioning systems (Halliday, Beggs et al, 2002;Gommed and Grossman, 2007;Beccali, Finocchiaro et al, 2012;Hassan and Mohamad, 2012), to date system complexity has severely limited their wider application and outweighed the significant energy savings they can achieve (Jain and Bansal, 2007). Furthermore, space, complexity and leakage are often cited as a significant barrier to the wider use of liquid desiccant air conditioning in building and tri-generation system applications (Jain and Bansal, 2007).…”

Section: Introductionmentioning

confidence: 99%

A Novel SOFC Tri-generation System for Building Applications

Elmer

2017

Springer Theses

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i AbstractIn response to the critical need to decarbonise the built environment, alternative methods for more effective energy utilisation need to be explored including trigeneration systems.Tri-generation is the simultaneous generation of electricity, heating and/or cooling from a single fuel source. Solid oxide fuel cell (SOFC) and liquid desiccant demonstrate many characteristics that make them an attractive option in the development of an efficient and effective tri-generation system. SOFCs have high operational electrical efficiencies and a thermal output in good agreement with the low temperature regeneration requirement of liquid desiccants.The aim of this thesis is to design, develop and test an efficient and effective proof of concept tri-generation system based on SOFC and liquid desiccant air conditioning technology for building applications. An extensive review of the literature shows that no previous work has been reported on such a system. The research has critically examined, both theoretically and experimentally, the novel tri-generation system concept.Simulations show tri-generation system efficiencies of up to 71% are achievable at a 1.5kW e capacity, which are encouraging values for a system of this size. An integration analysis, based on empirical data, provides good agreement with the simulations. At a 1.5kW e output, a tri-generation efficiency of 69% has been demonstrated. The inclusion of liquid desiccant air conditioning provides an efficiency increase of up to 15% compared to SOFC electrical operation only, demonstrating the merit of the novel tri-generation system in applications that require simultaneous electrical power, heating and dehumidification/cooling. An experimental system, using a micro-tubular SOFC shows the novel system can generate 150W of electrical power, 443W of heat or 279W of cooling. Instantaneous tri-generation system efficiency is low at around 25%. This is primarily due to the low capacity and poor performance of the micro-tubular SOFC. Although the performance is low, the experimental results demonstrate regeneration of a potassium formate desiccant solution using the thermal output from the microtubular SOFC in the first of its kind tri-generation system. The thesis has established that a clear operational advantage of the novel SOFC liquid desiccant Abstract f ii tri-generation system is the potential for nonsynchronous operation. The constant SOFC thermal output can be used to re-concentrate the desiccant solution as a form of thermal energy storage. Unlike thermal storage techniques based on sensible energy, a significant advantage of (chemical) thermal energy storage in the form of strong desiccant solution is that there are minimal losses over time.Using this nonsynchronous operating concept, the experimental system can generate an increased peak cooling output of up to 527W and a daily tri-generation efficiency of 38%.An economic assessment demonstrates questionable performance; however this is anticipated to improve with SOFC capital cost reduct...

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Section: Introductionmentioning

confidence: 99%

A Novel SOFC Tri-generation System for Building Applications

Elmer

2017

Springer Theses

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“…A number of research studies on the SDCS have been reported theoretically and experimentally [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For instance, Li et al [7] investigated the performance of two-stage desiccant cooling/heating system powered by solar energy.…”

Section: Introductionmentioning

confidence: 99%

Solar assisted desiccant evaporative cooling system for office buildings in Iran: a yearly simulation model

Ahmadzadehtalatapeh

2017

Scientia Iranica

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Abstract. In this research, the feasibility of solar assisted desiccant evaporative cooling system for o ce buildings was studied. An o ce building located in Chabahar, Iran, as a high cooling load demanding region, was considered as the case study. Di erent con gurations as desiccant-based cooling systems were examined to determine the most appropriate con guration in terms of established indoor air conditions and required cooling energy. The con gurations were simulated hourly, and the monthly mean values were determined. TRNSYS software was used for this purpose. The results indicated that the desiccant-based cooling system operating in the recirculation cycle with precooling Con g. E has the potential to keep the indoor air conditions within the standard recommendations. In addition, it was shown that Con g. E is the superior con guration in terms of the energy performance and can meet the cooling energy requirements of the space. The potential for providing the desiccant regeneration heat by the solar energy was also investigated. Three standard solar thermal panels were explored to propose the most proper array plant. The study showed that an array of solar panels, consisting of two rows of four unglazed solar thermal collectors, could meet the heat energy requirement by the regenerating process.

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“…It has the capability of removing airborne pollutants. The technology of adsorptive desiccant cooling presents interesting prospects as regards market penetration (Ando & Kodama, 2005;Davanagere et al, 1999;Elsayed et al, 2006Elsayed et al, , 2008Ge et al, 2008;Halliday et al, 2002;Hamed, 2003;Kabeel, 2007;Kodama et al, 2001;Mavroudaki et al, 2002;Oshima et al, 2006). The desiccants are natural or synthetic substances capable of absorbing or adsorbing watervapor due to the difference of water-vapor pressure between the surrounding air and the desiccant surface.…”

Section: Introductionmentioning

confidence: 99%