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This paper presents a novel heating, ventilation, and air-conditioning system that can achieve significant energy savings. A smart register that can reduce overall energy costs by up to 30%, compared to conventional devices, is demonstrated. A high abstraction model based on a computational fluid dynamics (CFD) simulation is developed to predict the diffused airflow from the register. The model is...
Dry storage casks are standalone containers that can be used to store spent nuclear fuel for an extended period of time. This paper is about the modeling and simulation of air ventilated dry storage cask used for long term storage of spent fuel assemblies from pressurized water reactors. A two-dimensional axis-symmetric model is generated for the actual cask geometry in order to simulate the thermal...
Gravity-driven flow is an attractive approach to develop simpler microfluidic systems. Because clogged microchannels could easily lead to fatal operational failures, it is crucial to monitor flow rate in these systems. Therefore, we propose here for the first time a numerical model that combines a calorimetric flow sensor and a gravity-driven system. With the validated model, we studied the flow behavior...
In recent years, co-simulation and model exchange approaches have become ever more popular within the context of model-based design and analysis. This trend has led to the development of the Functional Mock-up Interface (FMI) specification — the de facto standard for model exchange and co-simulation — and a growing number of FMI-compliant tools. This paper addresses the FMI-based co-simulation of...
In this paper, simulation model for the response time of micro flow sensor using COMSOL Multiphysics is presented. The detailed structure of the micro flow sensor chip is considered in the simulation model. What's more, the temperature dependencies of physical properties of air are defined to improve the model precision. The model takes into consideration the transient conduction and convection between...
In this paper, simulation model for the response time of micro flow sensor using COMSOL Multiphysics is presented. The detailed structure of the micro flow sensor chip is considered in the simulation model. What's more, the temperature dependencies of physical properties of air are defined to improve the model precision. The model takes into consideration the transient conduction and convection between...
This is an effort to use natural convection inside a room to enhance the heat flow from a ceiling-mounted recessed LED fixture. Thermal performance of recessed fixtures is evaluated experimentally in a wooden box specified by Underwriters Laboratories, called a UL box. The UL box is approximately 0.67 × 0.62 × 0.46 m and is used to emulate an insulated ceiling for testing purposes. The UL box is suspended...
This paper investigates the characteristics of the cryogenic rectification column as part of an ASU in IGCC plant. The mathematic model of the low pressure column and the condenser-reboiler is developed. Then, the static characteristics, such as the concentrations of nitrogen, oxygen and argon, the temperature and pressure in column are discussed. Starting from the steady-state, dynamic simulations...
Knowing the precise thermal behavior of switched reluctance machines is important to increase the power density of such machines. Up to now, literature is lacking about how to model in detail switched reluctance machines at high speed with axial air-gap flow. The aim of this paper is to present a model showing the effects of varied air-gap flow on temperature distribution in vacuum cleaner machines...
This paper discusses mathematical modeling for development and implementation of a model-based optimal indoor climate control for a real-sized livestock stable system. As a typical modern and large-sized stable system, the considered stable uses hybrid ventilation and low-pressure climate control strategies. Due to the main concern of the feasibility for commercializing the developed control system,...
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