Abstract
An absorption air-conditioning system is a good choice for green buildings. It has the superiority in the utilization of renewable energy and the refrigerant is environment-friendly. However, the performance of the traditional absorption system has been restricted by the energy waste in the thermal regeneration process. Capacitive deionization (CDI) regeneration is proposed as a potential method to improve system efficiency. In the new method-based air-conditioning system, strong absorbent solutions and pure water are acquired with the joint work of two CDI units. Nevertheless, the practical CDI device is composed of a lot of CDI units, which is quite different from the theoretical model. To reveal the performance of multiple CDI units, the model of the double/multi-stage CDI system has been developed. Analysis has been made to expose the influence of some key parameters. The results show the double-stage system has better performance than the single-stage system under certain conditions. The coefficient of performance (COP) could exceed 4.5, which is higher than the traditional thermal energy-driven system, or even as competitive as the vapor compression system. More stages with proper voltage distribution better the performance. It also provides the optimization method for the multi-stage CDI system.
Highlights
IntroductionIn buildings, airconditioning systems take up more than 40% of the energy [3], so it would be meaningful to make those systems more energy conservative
Han et al [6] proposed an absorption–compression refrigeration system based on cascade use of mid-temperature waste heat
The results show that the electric power consumption of the cascaded system is reduced by 61% and the coefficient of performance (COP) is improved by 155%
Summary
In buildings, airconditioning systems take up more than 40% of the energy [3], so it would be meaningful to make those systems more energy conservative. The most widely used system is the vapor compression air-conditioning system, which heavily depends on electric power and the refrigerant causes environmental problems. The absorption air-conditioning system could be a better choice as it favors renewable energy and the refrigerant is more environment-friendly [4,5]. Han et al [6] proposed an absorption–compression refrigeration system based on cascade use of mid-temperature waste heat. With the same waste heat input, the proposed system generates 46.7% more cooling energy than the conventional ammonia-water absorption refrigerator. The results show that the electric power consumption of the cascaded system is reduced by 61% and the coefficient of performance (COP) is improved by 155%
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