New type of sorption composite for chemical heat pump and refrigeration systems

Zajączkowski, Bartosz; Królicki, Z.; Jeżowski, A.

doi:10.1016/j.applthermaleng.2010.03.005

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…In order to achieve good adsorption properties, highly porous materials are required, which, in turn, result in low thermal conductivity. According to [18], there are three possible ways to assemble the adsorbent-adsorber: Fill the adsorber with adsorbent grains [19][20][21], coat the adsorbers [21], or consolidate the composite adsorbents [9,22]. Adsorbent-adsorber assembly influences both the heat transfer from the adsorber surface to the grains, as well as the inter-and intraparticle mass transfer of the adsorbate vapor.…”

Section: Adsorbate-adsorber Assemblymentioning

confidence: 99%

Experimental Study of Performance Improvement of 3-Bed and 2-Evaporator Adsorption Chiller by Control Optimization

et al. 2019

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The main challenge facing adsorption cooling technology is low Coefficient of Performance (COP), which becomes a key factor of the commercialization of this technology. This paper presents the results of modifications, aiming to increase COP, applied to the control software of a prototype three-bed two-evaporator adsorption chiller. Changes were mainly related to the sequence of the switching valves and had no influence on the hardware of the chiller. The sequence changes enabled the introduction of heat recovery and mass regeneration. Moreover, the precooling process was improved. The applied modifications not only resulted in significant improvement of the chiller's COP, but also improved the cooperation adsorption unit heating source, which is of great importance in case of district heating supply. The improvement was also observed concerning such operational aspects as noise and vibrations. In the authors' opinion, the presented modifications can be introduced to most exploited adsorption chillers and could potentially lead to similar improvements in performance.Energies 2019, 12, 3943 2 of 17 Methods of Improving COP of Adsorption ChillerThe issue of COP improvement of adsorption chillers is the subject of much research, which focuses on two main fields of study: Improvements via hardware modification and via software modification. Hardware modifications mainly consist of the proper selection of working pairs, the optimization of the adsorption beds [8], and the general system design. Software modifications reported in the literature optimize the switching time and cycle allocation. Some of the optimization methods, like the application of heat or mass recovery, usually require both hardware and software modifications. Working PairsThe appropriate selection of the working pair was reported in [9,10] as a crucial factor influencing the COP of adsorption chillers. Therefore, much reported research is related to adsorption working pairs and their properties [10]. The most popular pairs are microporous silica gel and water, zeolite and water (including alumino-silicate zeolites) [11,12], and Y-type zeolite with methanol or ethanol combinations [9,13]. Moreover, some novel adsorption working pairs are investigated, that is (silico) aluminophosphate-water, consolidated adsorbents such as LiBr-silica-ethanol or water, CaCl 2 -silica and water, and activated carbon with ethanol, methanol or water [9].Each adsorption working pair has unique properties that make it possible to obtain good performance in the conditions considered. For example, water-based pairs cannot be applied to achieve temperatures lower than 0 • C (due to water's freezing point). Some of the adsorbates, like methanol, are harmful, and its application would probably require additional safety procedures. An overview of working pairs was presented by [14]. Other important factors which must be considered are the expense and availability of the selected adsorption working pair.

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Section: Adsorbate-adsorber Assemblymentioning

confidence: 99%

Experimental Study of Performance Improvement of 3-Bed and 2-Evaporator Adsorption Chiller by Control Optimization

et al. 2019

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“…Coated heat exchangers have been frequently proposed to achieve those goals, due to their simple construction and the reduced thermal resistance between the conductive surface and the adsorbent [ 3 , 4 , 5 ]. Expanded graphite is one of the most common materials in the production of adsorbent composites [ 6 , 7 , 8 , 9 ]. Metallic foams and metallic fibers have also been used as a substrate to increase the average thermal conductivity of the adsorber [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

New Experimental Installation to Determine Adsorptive Properties of Magnesium Sulphate

2020

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Adsorption processes are of great interest in catalysis, material separation, and thermal management. In recent decades, adsorbents have been further investigated because of their applications in adsorption refrigeration, heat pumps, and thermal energy storage. Thus, there is an increasing need to determine the macroscopic properties of the adsorbent, specifically their adsorption/desorption capacity and speed, because these two factors determine the power and size of the corresponding adsorber. Many designs have been proposed, but there is still not a generally adopted technology for the analysis of those properties. In this paper, a novel instrument is described, which is capable of determining the macrokinetic properties of an adsorbent composite, with better control and higher accuracy than gravimetric, volumetric, or barometric installations, and lower price and complexity than spectroscopic installations. The design of the installation is detailed, highlighting the main challenges and critical factors. The two working modes of the installation are described, and one example is provided and analyzed for each of them.

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“…Sensible thermal energy storage, latent thermal energy storage, and chemical thermal energy storage (CTES) are the three main types of thermal energy storage . CTES is attracting considerable attention because of advantages including a broad range of working temperatures, a high energy storage density, and minimal loss of heat to the environment during storage . However, to render the CTES technique available and efficient, suitable materials with appropriate reversible chemical reactions should be identified.…”

Section: Introductionmentioning

confidence: 99%

“…[5,6] CTES is attracting considerable attention because of advantages including ab road range of working temperatures, ahigh energy storage density,and minimal loss of heat to the environmentd uring storage. [7][8][9][10] However, tor endert he CTES techniquea vailable and efficient, suitable materials with appropriate reversible chemical reactions should be identified. Numerous CTES reactions ystems, includingh ydride-, [11,12] hydroxide-, [13][14][15] redox-, [16,17] carbonate-, [18][19][20][21] and ammonium-based systems, [22][23][24] have been investigated for usei nh igh operation temperature ranges of 573 Kt o 1273 K.…”

Section: Introductionmentioning

confidence: 99%

Porous‐Resin‐Supported Calcium Sulfate Materials for Thermal Energy Storage

Huang

Huhetaoli

et al. 2016

Energy Tech

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A new porous‐resin‐supported calcium sulfate (CaSO4‐PSM) material with high‐density and high reactivity for chemical heat storage is developed and characterized. The newly developed CaSO4‐PSM exhibits a higher reactivity than normal CaSO4. Furthermore, the particle diameter is an important factor for the development of new chemical thermal energy storage (CTES) material. CaSO4‐PSM exhibits good performance in the hydration and dehydration processes when used as a CTES material. The hydration reaction rate of the particle with a diameter of 75 μm is 13.3 times of that of 750 μm, whereas, the dehydration reaction velocity is approximately 1.5 times higher. This finding is due to more abundant favorable pore channels for vapor transport and a larger specific surface area. Aggregation of the CaSO4 particles before and after repetitive operations can be eliminated, and a good durability of the new porous supported thermal energy storage material of CaSO4 can be obtained.

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New type of sorption composite for chemical heat pump and refrigeration systems

Cited by 16 publications

References 16 publications

Experimental Study of Performance Improvement of 3-Bed and 2-Evaporator Adsorption Chiller by Control Optimization

Experimental Study of Performance Improvement of 3-Bed and 2-Evaporator Adsorption Chiller by Control Optimization

New Experimental Installation to Determine Adsorptive Properties of Magnesium Sulphate

Porous‐Resin‐Supported Calcium Sulfate Materials for Thermal Energy Storage

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