Evaluation of a seasonal storage system of solar energy for house heating using different absorption couples

Liu, Hui; Edem, N’Tsoukpoe K.; Nolwenn, Le Pierres; Luo, Lingai

doi:10.1016/j.enconman.2010.12.049

Cited by 132 publications

(24 citation statements)

References 10 publications

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“…The possibility of loss-free storage makes thermo-chemical fluids a promising opportunity for seasonal heat storages in solar-heated buildings. Sodium hydroxide solution is recommended as a suitable storage medium in various publications (Weber, 2008;Hui, 2008;Goetz, 2001; [9,10,11]), but cannot be used in open processes: the reaction of sodium hydroxide with the carbon dioxide of the air forms a poorly soluble sodium carbonate, which precipitates in solid form during cooling processes and therefore clog pipes and plant components. The plant components for regeneration (desorber-condenser) as well as those for utilisation of the chemical potential (evaporator-absorber) shall operate at a negative pressure specified by the temperature level (vapour pressure of the water).…”

Section: Use Of Chemical Potential In Open Processmentioning

confidence: 99%

Thermo-Chemical District Networks

Koller¹,

Danesi²,

Bergmann³

2018

Proceedings of EuroSun 2018

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Thermo-chemical networks are a new technology for district networks, which can provide heating, cooling and drying in one heat loss-free multiservice network. The innovation is the use of thermo-chemical fluids as transport medium, e.g. in the form of concentrated salt solutions, rather than water. Due to the hygroscopic characteristics of the salt solutions, a chemical potential is transported and not thermal energy as in conventional networks. The chemical potential is used to generate useful heat or cold from ambient heat at the place and time of demand or to dehumidify air for drying or air conditioning processes. An important advantage of this novel technology is that the technology is heat loss-free, which means the thermochemical potential stored in the fluids degrade neither in the piping infrastructures nor in storages. In comparison to conventional district heating networks, thermo-chemical networks can be realized with less investment (no insulation is required) and over longer distances (no heat losses occur). The aspect of heat loss-free storage is also interesting for applications of seasonal thermal storage. In particular with solar energy, allowing shifting the energy available in summer to the wintertime. Thermo-chemical district networks and the possibility of long-term storages will improve the efficiency and profitability of the use of solar energy in district heating networks.

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Section: Use Of Chemical Potential In Open Processmentioning

confidence: 99%

Thermo-Chemical District Networks

Koller¹,

Danesi²,

Bergmann³

2018

Proceedings of EuroSun 2018

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“…Faster heat and mass transfer rates are possible with liquid absorption. Materials recently investigated include aqueous solutions of CaCl 2 [Quinnell et al, 2011], LiCl [Bales, 2006], NaOH , and KOH [Hui et al, 2011]. Hui et al compare absorption materials for use in low pressure (1.2 -4.2 kPa) absorption cycles and have reported theoretical material energy densities up to 476 kWh/m 3 [Hui et al, 2011], as shown in …”

Section: Liquid Absorptionmentioning

confidence: 99%

“…The mass of water that can be added and removed from the storage is function of the temperature and pressure in the system. To-date, sorption storage media have been selected primarily from commercially available materials, including physical adsorption of water vapor on porous molecular sieves, typically aluminosilicate zeolites [Jänchen , 2004 andJänchen , 2005], or silica gel, and absorption using aqueous lithium chloride (LiCl) [Bales, 2006], lithium bromide (LiBr) [Le Pierres et al, 2008], sodium hydroxide (NaOH) [Weber and Dorer, 2008], or calcium chloride (CaCl 2 ) [Hui et al, 2011]. Reported material energy densities, based on the enthalpy of sorption, are 130 to 780 kWh/m 3 [Hauer, 2008 andBales et al, 2008]).…”

Section: Overview Of Materialsmentioning

confidence: 99%

Development of Space Heating and Domestic Hot Water Systems with Compact Thermal Energy Storage

Davidson¹,

Quinnell²,

Burch³

et al. 2013

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“…It presents interesting thermal properties. However, LiBr crystallizes in dihydrated form at the temperature of the storage tank surrounding (5-10°C) with a water content of 29 wt% of water [2][3][4][5]. In view of replacement of LiBr, it was selected six other salts according to their literature data on their hydrated forms at low temperature, their solubility in water and their low price.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous study [2,3], it was proved that crystallization of the solution inside a storage tank was necessary to increase the storage density, and thus reduce the storage tank size and cost. Crystallization is possible due to a little circulation of fluid in the tank [4] and it must be reversible and controlled.…”

Section: Introductionmentioning

confidence: 99%