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Energy-efficient thermal energy generation and distribution in buildings
Published in Paul Tymkow, Savvas Tassou, Maria Kolokotroni, Hussam Jouhara, Building Services Design for Energy-Efficient Buildings, 2020
Paul Tymkow, Savvas Tassou, Maria Kolokotroni, Hussam Jouhara
Unlike absorption and vapour compression systems, adsorption refrigeration is an inherently cyclical process and multiple adsorbent beds are necessary to provide approximately continuous cooling delivery (Tassou et al. 2010). Adsorption systems inherently require large heat transfer surfaces to transfer heat to and from the adsorbent materials, which automatically makes cost an issue. High-efficiency systems require that heat of adsorption be recovered to provide part of the heat needed to regenerate the adsorbent. These regenerative cycles consequently need multiples of two-bed heat exchangers and complex heat transfer loops and controls to recover and use waste heat as the heat exchangers cycle between adsorbing and desorbing refrigerant.
Experimental study on adsorption capacity of an activated carbon-based adsorption water chiller
Published in International Journal of Ambient Energy, 2019
Hitesh Bhargav, Bharat Ramani, V. Siva Reddy
Over the last five decades, researchers have conducted significant investigations on the solar-based refrigeration system. One of the prominent green cooling technologies is the solar-powered adsorption refrigeration system. The adsorption-based cooling system is powered by low-grade heat including solar energy. The performance of the system relied on adsorption capacity of the working pair, available heat sources and system components’ design. Limited investigations on the adsorption capacity of working pairs have been performed by various researchers. The adsorption refrigeration system can be used for space cooling, space heating, food preservation, vaccine storage, water chiller and ice making purposes. The study on the adsorption capacity of working pairs for water chiller application has been unattended.
Utilizing Accessible Heat Enhancing Cooling Effect with Three Bed Solar Adsorption Chiller
Published in Heat Transfer Engineering, 2019
Rifat Ara Rouf, K. C. Amanul Alam, Bidyut Baran Saha, K. M. Ariful Kabir
The idea and application of adsorption technology has been in practice for the last four decades. Researchers have introduced advanced cycles both in theory and in application. Review on developments of adsorption technologies, working pairs and sorption engines powered by waste heat or solar powered adsorption and cooling methods can be found in literatures [1]–[7]. Different design and multiple heat transfer units have been studied for performance analysis of adsorption refrigeration and cooling units [8]–[13]. For utilization of low grade heat source, solar powered adsorption chillers have been studied for their different aspects [14]–[22]. Quite recently overview of theory and solar energy applications on adsorption refrigeration technology is published by Goyal et al. [23]. The main drawbacks of adsorption technology are; (a) high necessities related with the vacuum tightness of the container (b) lower coefficient of performance (COP) when compared with absorption technology (c) a relatively large specific mass and volume and (d) the fact that commercial adsorption cooling machines are expensive and have a limited number of suppliers. Askalany et al. [24] worked on the improvement of thermal conductivity of the adsorbent which would lead to better cooling effect of the adsorption chiller. Adsorption refrigeration uses physical or chemical attraction between a pair of substances to produce cooling effect. Chemical adsorption produces a much higher amount of heat of adsorption–desorption than physical adsorption. This technology not only utilizes wasted heat but also reduces global warming and thermal pollution [25]. Lately, study on improvement of the design parameters of heat exchanger and energy storage material is available [26]–[29].
Influence of bed temperature on performance of silica gel/methanol adsorption refrigeration system at adsorption equilibrium
Published in Particulate Science and Technology, 2021
Anirban Sur, Sharnil Pandya, Ramesh P. Sah, Ketan Kotecha, Swapnil Narkhede
Under sorption cooling, adsorption refrigeration seems very promising due to the use of an environment-friendly refrigerant and its operational simplicity (Anand, Gupta, and Tyagi 2015). Adsorption refrigeration is also attractive because it can be operated with a low-temperature thermal source (solar energy or waste heat of heat engine), generates very less noise and no vibration, and has a long life (Chihara and Suzuki 1983). Adsorption refrigeration can be very useful in hot regions where electricity is very scarce.