Adsorbents, Working Pairs and Coated Beds for Natural Refrigerants in Adsorption Chillers—State of the Art

Boruta, Piotr; Bujok, Tomasz; Mika, Łukasz; Sztekler, Karol

doi:10.3390/en14154707

Cited by 18 publications

(10 citation statements)

References 107 publications

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“…Adsorption refrigeration and air conditioning systems could be a better option in terms of huge energy saving potential, carbon emission reduction and waste heat utilisation. Adsorption system could be seen as an opportunity to reduce the consumption of non-renewable primary energy and carbon footprint (Boruta et al, 2021). Adsorption capacity (or "loading") is the most important characteristic of an adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of date-seed activated carbon as adsorbent in adsorption refrigeration system

Abdulkadir¹,

Kulla²,

Pam³

2022

Nig J Bas App Sci

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Vapour compression refrigeration systems are characterised by relative high energy requirement in addition to environmental pollution tendencies. Adsorption refrigeration system could be a better option in terms of huge energy savings and carbon emission reduction. This study is aimed at evaluating the performance and characteristics of date-seed activated carbon (DSAC) for use as adsorbent in adsorption refrigeration. Using isoster-based adsorbent/adsorbate equilibrium test rig, pressure, temperature and concentration (P-T-X) data were obtained. The isosteric heat of adsorption for conventional activated (CAC) and DSAC are estimated to a first approximation to be 16.058 and 16.650 kJ/Kg respectively. The results showed that date-seed activated carbon has relatively good adsorptive characteristics.

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of date-seed activated carbon as adsorbent in adsorption refrigeration system

Abdulkadir¹,

Kulla²,

Pam³

2022

Nig J Bas App Sci

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“…Additional advantages of adsorption chillers include low noise level, lack of system vibrations and no moving parts [15]. On the other hand, one of the main disadvantages of adsorption refrigeration equipment is discontinuity of operation and low coefficient of performance (COP), usually not exceeding a value of 0.6 [16], as well as a low specific cooling power (SCP) [17].…”

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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“…[13] Among these three heat transformers, adsorption heat transformers (AdHTs) are particularly promising as they are often based on weak physical interactions, allowing very low-temperature waste heat below 60 °C as driving energy. [14] Besides, AdHTs can employ nontoxic working pairs with high material stabilities and working capacities (e.g., AQSOA zeolites and water), [15] which are already well known from adsorption chillers. [15,16] Thus, AdHTs are an environmentally friendly technology that could increase energy efficiency, leading to a more sustainable industry.…”

Section: Introductionmentioning

confidence: 99%

“…[14] Besides, AdHTs can employ nontoxic working pairs with high material stabilities and working capacities (e.g., AQSOA zeolites and water), [15] which are already well known from adsorption chillers. [15,16] Thus, AdHTs are an environmentally friendly technology that could increase energy efficiency, leading to a more sustainable industry.…”

Section: Introductionmentioning

confidence: 99%

Closed‐Loop Adsorption‐Based Upgrading of Heat from 90 to 110 °C: Experimental Demonstration and Insights for Future Development

et al. 2022

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Industrial energy efficiency can be increased by recovering waste heat, mainly available below 100 °C. This low‐temperature waste heat can drive adsorption heat transformers (AdHTs) to upgrade waste heat to industrially relevant temperatures above 100 °C. Flexible process integration can be achieved by decoupling adsorptive and heat transfer fluid in closed‐loop cycles. However, the experimental feasibility of closed‐loop AdHTs has not been shown yet. Hence, this work studies an experimental one‐bed setup of an AdHT based on a closed‐loop cycle using silica gel 123 and water as the working pair. Experimental feasibility is demonstrated for heat transformation from 90 to 110 °C with waste heat released at 25 °C. The highest coefficient of performance (COP) is 0.183 J J−1 (23% of the maximum Carnot efficiency), and the highest specific heating power (SHP) is 168 W kg−1. A systematic variation of the operating conditions shows that efficiency COP and power density SHP strongly depend on the operating temperatures, volume flows, and phase times. Furthermore, avoiding condensation inside the adsorber casing and heat losses are identified to be crucial for the design of AdHTs. In summary, AdHTs based on a closed‐loop cycle show a promising performance to recover low‐temperature waste heat.

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Adsorbents, Working Pairs and Coated Beds for Natural Refrigerants in Adsorption Chillers—State of the Art

Cited by 18 publications

References 107 publications

Performance evaluation of date-seed activated carbon as adsorbent in adsorption refrigeration system

Performance evaluation of date-seed activated carbon as adsorbent in adsorption refrigeration system

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

Closed‐Loop Adsorption‐Based Upgrading of Heat from 90 to 110 °C: Experimental Demonstration and Insights for Future Development

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