Abstract
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.
Highlights
Adsorption systems appear to be a promising way to cover the increasing demand for air-conditioning
In the case of district heating temperatures utilized in adsorption chillers, the increased Coefficient of Performance (COP) is key to the successful large-scale implementation of this technology in the market
This paper presents a novel approach to the optimization of adsorption chiller performance, which is carried out on an existing large-scale (90 kW of cooling power) prototype three-bed two-evaporator adsorption chiller
Summary
Adsorption systems appear to be a promising way to cover the increasing demand for air-conditioning. It is especially suitable in countries like Poland, where CHP accounts for about 20%. The district heating water temperature is usually reduced to about 70 ◦ C during the summer [2,3] The temperature of this heating water is high enough to drive an adsorption chiller. In the case of district heating temperatures utilized in adsorption chillers, the increased COP is key to the successful large-scale implementation of this technology in the market. Due to introduced modifications of the control software, the COP exceeded 0.7, which is, according to the authors’ knowledge, state-of-the-art adsorption chiller performance. It is likely that similar, noninvasive modifications may be introduced to increase the performance of already exploited devices
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