Novel Adsorption Cycle for High-Efficiency Adsorption Heat Pumps and Chillers: Modeling and Simulation Results

Schwamberger, Valentin; Desai, Aditya; Schmidt, Ferdinand

doi:10.3390/en13010019

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…Schamberger et al [2] comprehensively described and analyzed a new Stratisorp cycle, which is an advanced version of the common adsorptive cycles with internal heat recovery [3]. The basic concept of the Stratisorp cycle is the connection of the adsorber with a well-insulated, stratified thermal storage tank, where the heat released during the adsorption phase is stored.…”

Section: Development Of Novel and Optimization Of Known Ahts Applicat...mentioning

confidence: 99%

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Adsorptive Systems for Heat Transformation and Heat Storage Applications

Gordeeva

Aristov

2022

Energies

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Section: Development Of Novel and Optimization Of Known Ahts Applicat...mentioning

confidence: 99%

“…However, it is reached at the expense of new irreversibility, due to convective mixing within the storage tank. Yet, the total entropy generation is reduced (see Figure 6 in [2]), thanks to the internal heat recovery in the storage tank.…”

Section: Development Of Novel and Optimization Of Known Ahts Applicat...mentioning

confidence: 99%

Adsorptive Systems for Heat Transformation and Heat Storage Applications

Gordeeva

Aristov

2022

Energies

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“…It is worth noticing that in most cases of adsorption chillers, the medium that heats or preheats the bed is water and, in some cases, also thermal oil [34,35]. Ng et al [36] suggested that adsorption chillers can be driven by low-temperature steam, but they did not provide any information about the effects of using steam for bed regeneration on the operating parameters, e.g., temperatures, pressures and COP, of the chiller.…”

Section: Desalination Technology Electrical Energymentioning

confidence: 99%

The Effects of Using Steam to Preheat the Beds of an Adsorption Chiller with Desalination Function

et al. 2021

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Adsorption chillers are a promising alternative to traditional compressor-based devices. Adsorption chillers can be supplied with low- or medium-temperature waste heat or heat from renewable energy sources. In addition, they can be used for water desalination purposes. Thus, the adsorption chillers are unique devices that meet essential problems of the modern world: a need to limit the negative impact of humankind on the natural environment and growing problems with access to drinking water. However, adsorption chillers also have disadvantages, including ineffective operation and large size. Therefore, in this paper, the influence of steam utilization on the operation of an adsorption chiller with water desalination function was investigated experimentally, which has not been done before. The research was carried out on the adsorption chiller, working on a silica gel–water pair, installed in the AGH UST Center of Energy. The chiller was modified to preheat the sorbent with the use of steam. The results show that the use of steam instead of water for preheating the bed leads to higher temperatures in the heat exchanger and the bed. As a result, heat transfer from the heating medium to the bed is more intense, and a significant shortening of the desorption process is observed. In the case of using steam for preheating, the desorption time was about 30 s, while for water, it was 300 s. Thanks to this solution, it is possible to reduce the size of the device and increase its efficiency. The proposed solution opens a new course of research on adsorption chillers and broadens the horizon of their applications, as steam is a by-product of many industrial processes.

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“…The mass and heat transfer were also interpreted using this model. They quantitatively studied the regeneration temperature on the cooling performance [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of a Two-Stage Air Cooled Adsorption Chiller with Heat Recovery Part I: Physical and Mathematical Performance Model

et al. 2022

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In the proposed work, the MATLAB program was used to model and simulate the performance of the investigated two-stage adsorption chiller with and without heat recovery using an activated carbon/methanol pair. The simulated model results were then validated by the experimental results conducted by Millennium Industries. The model was based on 10th order differential equations; six of them were used to predict bed, evaporator and condenser temperatures while the other four equations were used to calculate the adsorption isotherm and adsorption kinetics. The detailed validation is stated in the next paragraphs; for example, it clearly notes that the simulation model results for the two-stage air cooled chiller are well compared with the experimental data in terms of cooling capacity (6.7 kW for the model compared with 6.14 kW from the experimental results at the same conditions). The Coefficient of Performance (COP) predicted by this simulation was 0.4, which is very close to that given by the Carnot cycle working at the same operating conditions. The model optimized the switching time, adsorption/desorption time and heat recovery time to maximize both cooling capacity and COP. The model optimized the adsorption/desorption cycle time (300 to 400 s), switching cycle time (50 s) and heat recovery cycle time (30 s). The temporal history of bed, evaporator and condenser temperatures is provided by this model for both heat recovery and without heat recovery chiller operation modes. The importance of this study is that it will be used as a basis for future series production.

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Novel Adsorption Cycle for High-Efficiency Adsorption Heat Pumps and Chillers: Modeling and Simulation Results

Cited by 6 publications

References 26 publications

Adsorptive Systems for Heat Transformation and Heat Storage Applications

Adsorptive Systems for Heat Transformation and Heat Storage Applications

The Effects of Using Steam to Preheat the Beds of an Adsorption Chiller with Desalination Function

Modeling and Simulation of a Two-Stage Air Cooled Adsorption Chiller with Heat Recovery Part I: Physical and Mathematical Performance Model

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