Design of Packed Bed Regenerator with By-pass
TL;DR: An explicit procedure for the design of a system containing a regenerator with bypass has been developed in this article, where the regenerator during the energy retrieval process is controlled so that the temperature of the recombined fluid stream is held at a selected value.
Abstract: An explicit procedure for the design of a system containing a regenerator with bypass has been developed. Bypass of the regenerator during the energy retrieval process is controlled so that the temperature of the recombined fluid stream is held at a selected value. The procedure involves two sets of curves. The design curves relate the specific characteristics of the storage matrix and the mass rate of flow of the fluid through the regenerator. The performance curves relate the nondimensional length and period to the thermal ratio, maximum pressure drop, duration of hot period, and temperature of the combined fluid stream during the retrieval process. The mass of the storage material and dimensions of the regenerator are determined for the specified operating conditions.
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TL;DR: In this article, the authors presented a concept adapted to magnetocaloric refrigeration in order to better suit an application of a continuous fluid flow such as an industrial process, called the by-pass flow, which consists in a derivation in the fluid flow from the active magnetic regenerator (AMR) to take a part of the heat transfer fluid from the cold side of the regenerator after passing it through a countercurrent heat exchanger to reinject it into the hot side.
Abstract: This paper presents a concept adapted to magnetocaloric refrigeration in order to better suit an application of a continuous fluid flow such as an industrial process. The concept, called the by-pass flow, consists in a derivation in the fluid flow from the Active Magnetic Regenerator (AMR) in order to take a part of the heat transfer fluid from the cold side of the regenerator after passing it through a counter-current heat exchanger to reinject it into the hot side. The value of the by-pass fluid flow rate has been studied by using two theoretical methods (qualitative and quantitative approaches) then validated by numerical simulations and experimental measurements. Numerical simulation shows an increase of 27% in the value of cooling power when the by-pass method is implemented. In the case of experimental measurements, the cooling power with the by-pass solution shows values between 8% and 22% more than the classic solution, depending on the frequency values. The main operations are described and the results are presented, analyzed and discussed.
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TL;DR: In this paper, the authors present techniques and theories covering the design and management of thermal energy storage systems in the areas of heat recovery and in circumstances where energy availability does not coincide chronologically with demand are presented.
Abstract: The newest techniques and theories covering the design and management of thermal energy storage systems in the areas of heat recovery and in circumstances where energy availability does not coincide chronologically with demand are presented. Techniques that predict the performance of sensible heat storage units in a broad range of operating conditions and methods for designing energy storage units for a variety of applications are covered comprehensively. The single blow problem of gas passing through heat-storing packing continuously in one direction is discussed. Solutions to this problem facilitate the control of the drying or cooling of beds of grain, other food stuffs, and industrial granular or powder products. These same solutions are applicable to the crucial issues of heat storage capabilities of particular construction in buildings and thermal stores built into solar collectors. Detailed information is included about counterflow regenerators including finite conductivity and nonlinear models. New concepts in computational methodology, parallel flow regenerators, heat storage exchangers, and packed beds are also covered. The optimization of prediction of heat storage systems and useful engineering correlations for thermal and hydraulic aspects of storage unit design are presented and explained in detail.
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TL;DR: In this paper, a set of performance curves relating the thermal ratio, harmonic mean reduced length and period, and minimum cold fluid outlet temperature is presented. And the performance and design curves are used in the design procedure to determine the dimensions of the regenerator for the specified operating conditions.
Abstract: An explicit procedure for the design and sizing of balanced regenerators has been developed. A set of performance curves relating the thermal ratio, harmonic mean reduced length and period, and minimum cold fluid outlet temperature is presented. The specific characteristics of the regenerator's matrix including the heat transfer and pressure drop correlations are used to develop interrelations, represented by a set of three design curves, between these quantitites and the operating characteristics of the regenerator. The performance and design curves are used in the design procedure to determine the dimensions of the regenerator for the specified operating conditions.
4 citations