Performance Evaluation of a Single-Stage Two-Bed Adsorption Chiller With Desalination Function

Sztekler, Karol; Kalawa, Wojciech; Nowak, Wojciech; Mika, Łukasz; Krzywański, Jarosław; Grabowska, Karolina; Sosnowski, Marcin; Al-Harbi, Ahmed A.

doi:10.1115/1.4048771

Cited by 33 publications

(20 citation statements)

References 12 publications

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“…The COP of the investigated chiller, in this work the three-bed adsorption chiller, is difficult to be compared to the COP of the other chillers investigated by the other researchers, since the COP is influenced by many factors, including the beds' construction, capacity, and material. Therefore, the three-bed adsorption chiller's COP obtained in this work is compared only to the COP of the same chiller but working in a two-bed mode, as investigated in the authors' previous study [26]. It should be noted that the temperatures of chilled and cooling water in the case of the two-bed adsorption chiller were 13 and 18 • C, respectively, which is almost the same as in the case of the three-bed chiller.…”

Section: Resultsmentioning

confidence: 99%

“…The beds' pressure and the average temperature of the evaporator, condenser, and beds, were also analyzed. The COP and SCP were calculated according to the formulas given in [26], which are presented below:…”

Section: Operating Conditionsmentioning

confidence: 99%

“…The SCP determines the cooling capacity obtained from 1 kg of the sorbent. Additionally, the COP of the investigated three-bed adsorption chiller was compared with the COP of the two-bed adsorption chiller investigated by Sztekler et al [26].…”

Section: Operating Conditionsmentioning

confidence: 99%

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Experimental Study of Three-Bed Adsorption Chiller with Desalination Function

et al. 2020

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Energy efficiency is one of the most important topics nowadays. It is strictly related to energy demand, energy policy, environmental pollution, and economic issues. Energy efficiency can be increased and operating costs reduced by using waste heat from other processes. One of the possibilities is to use sorption chillers to produce chilled water and desalinated water. Low-temperature waste heat is not easy to utilize because of the low energy potential. Using adsorption chillers in low-temperature conditions allows utilizing waste heat and producing useful products in many regions of the world. The paper presents the results of an experimental study carried out on a three-bed adsorption chiller with desalination function, using silica gel and water as a working pair. The laboratory test stand included one evaporator, one condenser, and three separate tanks for water, desalinated water, and brine, respectively. The test stands scheme and description were presented. All results were obtained during several test hours with stable temperature conditions in the range of 57–85 °C for the heating water. It is found that the Coefficient of Performance (COP) increased from 0.20 to 0.58 when the heating water temperature increased from 57 to 85 °C. A similar finding is reported for Specific Cooling Power (SCP), which increased from 27 to 160 W/kg as the heating water temperature increased from 57 to 85 °C. It can be concluded that the heating water temperature strongly impacts the performance of the adsorption chiller.

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Section: Resultsmentioning

confidence: 99%

Section: Operating Conditionsmentioning

confidence: 99%

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Experimental Study of Three-Bed Adsorption Chiller with Desalination Function

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“…Hygroscopic structure, strongly developed specific surface area, adsorption/desorption in the required temperature regime enabling the use of low-temperature thermal energy sources and large participation of micropores in the porous structure of silica gel guarantee compatibility with water as an adsorbate. Moreover, being an environmentally friendly refrigerant, water provides a desalination functionality of the considered prototype [46,47]. The spherical and irregular type of silica gel was examined in fluidized bed conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of an Intensified Heat Transfer Adsorption Bed (IHTAB) Reactor Prototype

et al. 2021

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The first experience in the operation of intensified heat transfer adsorption bed reactor designed for low-pressure adsorption processes is presented in this paper. This work aims to assess the possibility of fluidizing the porous media bed induced by the pressure difference between the evaporator and the adsorption reactor. The conducted experimental research allowed indicating the type of silica gel recommended to use in fluidized beds of adsorption chiller. The fixed bed of silica gel was observed for the lower pressure differences, while fluidization appeared in the case of the pressure difference between the evaporator and the adsorption chamber higher than 1000 Pa. The most significant differences in the adsorption process between the fixed bed and the fluidized bed are revealed in the changes of sorbent temperatures. The silica gel bed was fluidized with water vapor generated in the evaporator.

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“…where N, k n and k avg are the number of measurements (N = 300), the value of n-th measurement and average from 300 measurements, respectively. The coefficient of performance of the investigated chiller was calculated as [39]:…”

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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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Performance Evaluation of a Single-Stage Two-Bed Adsorption Chiller With Desalination Function

Cited by 33 publications

References 12 publications

Experimental Study of Three-Bed Adsorption Chiller with Desalination Function

Experimental Study of Three-Bed Adsorption Chiller with Desalination Function

Experimental Investigation of an Intensified Heat Transfer Adsorption Bed (IHTAB) Reactor Prototype

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

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