Preview — Exergy by Masanori Shukuya. Many people, professionals and non-professionals alike, recognize that it is of critical importance to solve global energy and environmental issues. For this purpose, it is essential to have a scientific understanding of what is meant by the energy issue is and the environmental issue.
The concept of exergy is a scientific concept that exactly fits. The concept of energy i Many people, professionals and non-professionals alike, recognize that it is of critical importance to solve global energy and environmental issues. The concept of energy is a scientifically-well established concept, namely to be conserved.
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Then the question is what is really consumed. Exergy: Theory and Applications in the Built Environment is dedicated to answer this fundamental question by discussing the theory of exergy and by demonstrating its use extensively to describe a variety of systems in particular for built-environmental conditioning. Exergy: Theory and Applications in the Built Environment introduces readers who are not familiar with thermodynamics to the concept of exergy with a variety of discussion on the built-environmental space such as heating, cooling, lighting, and others.
Readers, including students, researchers, planners, architects and engineers, will obtain a better picture of a sustainable built-environment. Get A Copy. Published January 14th by Springer London first published November 5th More Details Other Editions 4. Friend Reviews. See our disclaimer. Customer Reviews.
Write a review. See any care plans, options and policies that may be associated with this product. Email address. Please enter a valid email address. Walmart Services. Get to Know Us. Customer Service. In The Spotlight. Shop Our Brands. All Rights Reserved. Cancel Submit. Using the modified method, Schweiker et al. The originality of this paper and its differences from previous research are as follows.
First, we preformed the unsteady-state sensitivity analysis using an unsteady-state model. Few studies have used this approach so that further analysis is necessary. Second, we set a unique case-study situation, i. Spaces such as school lecture rooms and office conference rooms tend to be used for short periods on an intermittent basis, and the periods when they may remain unheated e. It is thought that the period during which the stored coldness within a building envelope becomes warm, after the heating is started, requires a large amount of exergy and that during this period the thermal comfort is comparatively low.
The exergy balance equation is derived from energy and entropy together with the environmental temperature. Exergy balance equation for the system can be set up in a general form as follows:. Figure 1 shows the human body system. The human body exergy balance equation is also derived by combining the following three elements: a human body energy balance equation, a human body entropy balance equation, and the environmental temperature outdoor air temperature.
The human body exergy balance equation is expressed as follows  :.
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This method enables us to conduct unsteady-state human-body exergy analyses . We set the calculation interval to 1 minute to stabilize the calculation in this study since such calculations become unstable when the time interval is equal to or greater than 2 minutes. The detailed procedure is described in  . Figure 1. Human body system. The fixed conditions of the experiment are shown in Table 1. The calculation considered a period of minutes, which assumed a transfer e.
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The metabolic rate and the amount of clothing were set to reflect the outdoor transit period and the period indoors. Four Cases are shown in Table 2 for comparison. These values represent the ambient temperatures when heating was inactive. It was assumed that the occupants removed a coat outside clothing after entering the room space in Case 1, while they kept wearing the coat in Case 2.
The temperatures in both cases represent the activation of convective heating immediately after the occupants entered a room that has not been in use for a long period of time.
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Case 3 represents a building envelope that has a comparatively large heat capacity, whereas Case 4 represents a room where wood paneling was installed on the interior surfaces of a building envelope with a comparatively large heat capacity such as concrete , or a wooden construction where the building envelope has a comparatively small heat capacity.
The temperatures of the core, shell, and clothing are shown in Figures , respectively. During the time of the outdoor transfer, all four cases changed at the same rate in response to the external environment. In the indoor period in Figure 2 , the core temperature in Case 1, Case 2, and Case 3 dropped, whereas that in Case 4 remained almost stable.
In the indoor period in Figure 3 , the shell temperature in Case 1, Case 2, and Case 3 dropped, whereas that in Case 4 rose gradually. It is considered in Case 4 that the shell temperature that dropped during. Table 1. Fixed conditions. Table 2. Comparative conditions. Figure 2.
Exergy - Theory and Applications in the Built Environment | Masanori Shukuya | Springer
Figure 3. Figure 4. In the indoor period in Figure 4 , the clothing temperature in Case 3, Case 1, and Case 2 dropped slightly, whereas that in Case 4 rose slightly. The shell ratio and blood flow rate are shown in Figure 5 and Figure 6 , respectively. During the indoor period in Case 1, Case 2, and Case 3, the shell ratio increased gently Figure 5 and the blood flow rate decreased Figure 6.
Conversely, in Case 4, the shell ratio became smaller and the blood flow rate increased.
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It is thought that the physiological adaptation that increased the shell ratio and decreased the blood flow rate in Case 1, Case. Figure 5. Shell ratio [-].