This communication presents the performance evaluation and comparative study between two different techniques: a membrane-based dehumidification system (MDS) and evaporative cooling dehumidification (ECD) for a typical climate of South Korea. Although there are different ways to dehumidify the air in living and work spaces, the membrane-based dehumidification system (MDS) is the most effective way as it neither causes a change in the temperature nor harms the environment. Moreover, it consumes significantly less energy when compared to other methods. There are also limitations concerning products that are sensitive to temperature such as food and pharmaceutical products; the method of evaporative cooling dehumidification is not suitable for such applications. The present work demonstrated the excellent energy-saving performance of the membrane-based dehumidification system against evaporative cooling dehumidification by comparing the performance of these two systems during the rainy season using a transient system simulation. The results showed that the MDS helped to reduce the dehumidification load by more than 47.6% when compared to the ECD system, which is a significant achievement in this regard.
The purpose of the present study is to analyze pressure difference changes inside a high-temperature steam generator (HTSG), which produces steam using the heat generated by waste incineration and decreases the pressure of the produced steam while increasing its temperature. The high-temperature, low-pressure steam produced by a HTSG is used for hydrogen production. Therefore, the steam temperature must be at least 700 • C, and the pressure must be lower than 300 kPa; hence, a device is needed to increase the steam temperature in the boiler and decrease the steam pressure. The physical behavior of the device was modeled and experimentally validated. The modeling and experimental results demonstrated good agreement when the steam was not preheated; however, an additional pressure drop required consideration of the opposite case.
The Generation IV Supercritical Water Reactor (GEN IV SCWR) is being proposed as an advanced high efficiency thermal reactor for baseload electricity production. One of the major unknowns with this reactor concept is the behavior of fuel cladding and structural components under the extremely aggressive SCWR environment. The objective of this project was to evaluate candidate materials for SCWR application. The path the project has taken is to first determine the most likely candidate materials by surveying the literature in three principle areas; existing supercritical water fossil plants (SCFP), commercial light-water reactors (LWR) and DOE research programs in liquid-metal-fast-breeder (LMFBR) and fusion reactors. The work then entailed efforts to evaluate candidate alloys in terms of high temperature mechanical properties, corrosion and stress corrosion cracking, radiation stability. As the diagram in Figure 1 below depicts, the qualification testing was designed to provide a better understanding of likely degradation processes, aiding in the development of potential mitigation strategies. Two anticipated outcomes of the project are the production of information that can ultimately be used by SCWR system designers and guidance for future investigations involving in-reactor irradiation experiments. Identify candidate materials from fossil, LWR, and LMFBR experience Perform qualification testing on selected candidate materials Develop understanding of life-limiting materials degradation processes Investigate degradation mitigation strategies Provide initial set of materials recommendations and guidance for future in-reactor testing Year 1 Year 2 & 3 Year 3 Identify candidate materials from fossil, LWR, and LMFBR experience Perform qualification testing on selected candidate materials Develop understanding of life-limiting materials degradation processes Investigate degradation mitigation strategies Develop understanding of life-limiting materials degradation processes Investigate degradation mitigation strategies Provide initial set of materials recommendations and guidance for future in-reactor testing Year 1 Year 2 & 3 Year 3 Figure 1 Chart of project objectives and research progress. vii Research Progress Highlights of Literature Survey The literature survey was completed in the first half of year 1, and candidate materials were selected. As part of this effort, the areas where particular information gaps existed were identified in order to guide selection of the qualification test matrix. Ferritic-martensitic (F-M) steels were chosen due to their extensive use in SCFP internals. In addition, one of the early generation ferritic alloys (HT-9) was tested extensively in the US LMFBR program and was shown to have extremely high swelling resistance. However, the creep strength of HT-9 is too low for application under SCWR conditions and thus it was not selected as a primary candidate alloy, although it was used in testing to establish baseline behavior on an alloy with well known radiation performance. F-M alloys...
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