Relevant bibliographies by topics / Overall thermal transfer value (OTTV )

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  2. Dissertations / Theses
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Academic literature on the topic 'Overall thermal transfer value (OTTV )'

Author: Grafiati
Published: 3 June 2025
Last updated: 22 June 2025

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Journal articles on the topic "Overall thermal transfer value (OTTV )"

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Hidayat, Muhammad Syarif. "Studi Overall Thermal Transfer Value (OTTV) di Gedung Kampus Universitas." Metrik Serial Teknologi dan Sains 3, no. 2 (2022): 1–7. http://dx.doi.org/10.51616/teksi.v3i2.344.

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Perkembangan waktu yang cepat dalam ruang itu sendiri menjadi perhatian khusus untuk arsitektur hemat energi. Sistem biaya dapat dilakukan dengan pengaturan beban dan penggunaan sistem pengendalian udara yang sesuai. Untuk mengurangi beban panas luar, Badan Standardisasi Nasional Indonesia dalam SNI 03-6389-2000 tentang Konservasi Energi Lembaran Bangunan yang digunakan dalam Total Thermal Transfer Price (Total Thermal Transfer Value/OTTV) adalah 35 Watt/m². Untuk mencapai kualifikasi Bangunan hemat energi diperlukan parameter energi energi. Jenis energi yang digunakan antara lain kaca dinding atau Window to Wall Ratio (WWR), jenis, warna dinding terang dan luar, pelindung, konduktansi kaca, insulasi atap dan dinding, perbaikan atap dan dinding, arah hadap dan banyak lagi. Penerapan konsep hemat energi pada sektor bangunan akan berpengaruh signifikan terhadap keberlanjutan energi. Salah satu upaya energi pada bangunan gedung adalah dengan mengurangi beban luar. Dalam penelitian ini akan dikaji bagaimana nilai OTTV pada fasad gedung kampus Universitas Mercu Buana Jakarta Barat. Nilai OTTV akan dibandingkan dengan standar OTTV sesuai SNI.
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Sudprasert, Sudaporn, and Sivayu Klinsmith. "Assessment of Overall Thermal Transfer Value (OTTV) in Buildings with Inclined Glass Wall." Journal of Architectural/Planning Research and Studies (JARS) 11, no. 1 (2014): 109–18. http://dx.doi.org/10.56261/jars.v11i1.23882.

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The Ministry of Energy of Thailand promulgated the criteria for computing the Overall Thermal Transfer Values (OTTV) to manage building energy efficiency in 1992. These criteria were improved in 2009 to cover dissimilar heat transfer rates in the daytime and the nighttime for offices, stores and hotels constructed with 0 to 90-degree roofs and walls. However, the assessment of OTTV of buildings with wall inclinations greater than 90 degrees has been excluded with only approximate values being used in the calculation. The objective of this paper, therefore, is to propose a calculation method of Effective Solar Radiation (ESR), a variable in OTTV equation, for office buildings with 105-150 degree wall inclinations, taking into account the effects of ground reflectance values of 0.05, 0.2 and 0.32 for water, grass, and white concrete, respectively. The ESR values for the inclined glass wall were obtained from the slope of linear relationship between the simulated solar heat gain and the glass’s Solar Heat Gain Coefficient (SHGC). The simulated results and the regression analysis showed that the derived ESR values of the vertical wall were compatible with the ESR values in the building energy code (BEC) and the energy used index, similar to that obtained from energy audits. The ESR values decreased by 2.7-37% as the glass wall inclination increased, resulting in a decrease of the OTTV by 2.0-17%. For the high ground reflectance of 0.32 and SHGC of 0.54, the results showed that the OTTVs of the building with inclined walls exceeded 50 W/m2. Therefore, grass and water are recommended for the landscape around energy efficient buildings.
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Yaakob, Yusli. "Overall Thermal Transfer Value: A Preliminary Study of Residential Building in Hot-Humid Climate." Scientific Research Journal 22, Special Issue (2025): 189–205. https://doi.org/10.24191/srj.v22is.12788.

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Malaysia buildings have high intensity of solar radiation and high daily air temperature. Due to excessive heat and high air temperature can cause discomfort, and the occupants need to use the air-conditioning system. The use of air-conditioning has influence to increasing the energy consumption in buildings. To tackle this issue, the Overall Thermal Transfer Value (OTTV) standard as an assessment tool is used to measure of heat gain in the building. OTTV standard is applicable to minimize energy consumption of air conditioning. This study aimed to investigate the OTTV in single terrace house. The method used in this study is by direct calculation. The OTTV was calculated for two cases, namely case study model A and model B. The study considered parameters of building envelope such as window-to-wall ratio. U value, glazing material, and fenestration orientation. Through OTTV calculation, the result for case study model B in the southeast direction is 53.51 W/m2. Solar radiation through fenestration was contributor to the increasing of OTTV. Then, the total OTTV result for case study model A and model B was 22.86 W/m2 and 23.26 W/m2, respectively. The results showed that the building met the minimum requirements for the OTTV, less than 50W/m2. This study shows that some design consideration in building envelope have influence on the OTTV.
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Sari, Tri Wulan, Dyah Nurwidyaningrum, Jonathan Saputra, Denny Yatmadi, and Sujito Sujito. "ANALYSIS OF THERMAL TRANSFER VALUES IN TEACHING CLASSROOMS." AL ULUM: JURNAL SAINS DAN TEKNOLOGI 10, no. 2 (2024): 54. http://dx.doi.org/10.31602/jst.v10i2.15679.

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Erratic weather, such as intense heat followed by heavy rain, is causing air pollution in the sky of Jakarta. According to the SNI 03-6389-2011, which deals with energy conservation in building envelopes, the overall thermal transfer value (OTTV) for walls should not exceed 35 W/m2. This study aims to analyze OTTV in Class T and Class S. Class S uses clear glass, while Class T has a shading device in the form of a sunglass sticker. The method used involves calculating the total outer wall area, glass area, window-to-wall ratio (WWR), solar factor value, and then obtaining the OTTV. The results of the study show that the WWR value for Class T was 0.5, while for Class S it was 0.4. The OTTV value in Class T is 58.74 W/m2, whereas the OTTV in Class S is 70.64 W/m2. Despite both classrooms not meeting the SNI requirements, the classrooms using shading devices have OTTV values closer to the SNI standard.
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Vighio, Anees Ahmed, Rozana Zakaria, Faridahanim Ahmad, et al. "Overall Thermal Transfer Analysis of Glazing Facade Design for Passive Building Energy Efficiency." Civil and Environmental Engineering Reports 34, no. 4 (2024): 503–20. https://doi.org/10.59440/ceer/193131.

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The global warming incremental impacts such as temperature, precipitation, rise in sea level, and extreme weather events are indeed being observed globally. In recent decades, energy demand and greenhouse gas emissions have increased due to buildings being designed with active cooling and heating solutions, despite global attempts to reduce energy consumption. About 50 percent of all energy use is attributed to buildings. There has been a debate for Decades on building active and passive design, but very limited studies have been carried out to confirm the Overall Thermal Transfer Value (OTTV) during the operation phase of the building. This paper highlights the analysis of OTTV in the Passive Design Strategies using several conditions of glazing facades. The passive design of glazing facade strategies includes the variation in opaque wall Colour with different values of the coefficient of solar absorption, change in glazing type (U-Value and Shading Coefficient), and the decrease in the size of the openings. Building parameters were collected and OTTV was determined using the equation in Malaysian Standard MS 1525 for Energy Efficiency. The OTTV was then compared to the recommended value for Malaysia’s tropical climate. Results showed that different paint Colours improved OTTV by up to 23.05%, changing glazing type reduced OTTV from 76.93 W/m² (Base case) to 64.12 W/m² (Double Low-E, e2=.1 Tint green), and reducing glass area by 10% lowered OTTV to 62.24 W/m².Whereas, by combining the Type of Glazing and White facade Colour the OTTV was reduced to 39.68%. It is concluded that this OTTV analysis enhances building energy efficiency and reduces cooling loads.
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Hasanah, Dita, Adi Safyan Yahya, and Eri Saputra. "Analisa Nilai OTTV (Overall Thermal Transfer Value) pada Bangunan Pemerintahan di Kota Lhokseumawe." ETNIK: Jurnal Ekonomi dan Teknik 2, no. 10 (2023): 966–76. http://dx.doi.org/10.54543/etnik.v2i10.254.

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Global warming and the energy crisis are the biggest problems in the world today, many efforts must be made to avoid them. One of them is by continuing to increase the implementation of energy efficient buildings. In Indonesia, energy-efficient buildings must meet the requirements set out in SNI 03-6389-2020 where the maximum limit for the OTTV (Overall Thermal Transfer Value) value is 35 Watt/m² and has been enforced by the Government from now on. However, these requirements have not been fully fulfilled by investors, as well as planning agencies or consulting units. There are still many buildings whose OTTV value is not yet known. As is the case with the object of this research, namely the Lhokseumawe Mayor's Office building. This research aims to calculate and determine the OTTV value for the research object of the Lhokseumawe Mayor's Office building, so that later it will be known whether the building is categorized as an energy efficient building or not. The research method used is an experimental quantitative method using the OTTV Microsoft Excel spreadsheet calculator from the Ministry of Public Works and Public Housing (BGH-PUPR). The results of this research analysis show that the Lhokseumawe Mayor's Office building has many large openings and has sunlight fenestration, so that the overall OTTV value on the building envelope is below the SNI standard threshold of 35 Watt/m² and can be categorized as an energy efficient building.
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Ismail, Amirul Amin, and Azman Zainonabidin. "OVERALL TRANSFER THERMAL VALUE (OTTV) INDEX ASSESSMENT ON 4G11 TOWER, MINISTRY OF WOMEN FAMILY AND COMMUNITY DEVELOPMENT, PUTRAJAYA, MALAYSIA." Malaysian Journal of Sustainable Environment 1, no. 1 (2019): 106. http://dx.doi.org/10.24191/myse.v1i1.5564.

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In the Eleventh Malaysia Plan, Malaysia will be pioneering a sustainable city development by retrofitting all Government buildings to be energy efficient. Overall Thermal Transfer Value (OTTV) is a measuring tool of thermal efficiency for building envelope. A case study on iconic 4G11 Tower is carried out to determine the possibility of improving OTTV assessment for existing high-rise office building thus enhance the building’s overall efficiency. Through this exercise, several variables influence the OTTV score such as U-Value, Shading Coefficient (SC) and Window-to-Wall Ratio (WWR). Characterised by Baseline Design, MS1525 Design and Platinum Design, this will be a precedent of OTTV assessment for high-rise office building typology.
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Chow, W. "Controlling building energy use by Overall Thermal Transfer Value (OTTV)." Energy 25, no. 5 (2000): 463–78. http://dx.doi.org/10.1016/s0360-5442(99)00079-1.

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Mas'um, Iyad Naufal, Ria Rezky Amalia, and Gusti Hardyanti Musda. "Analisis OTTV (Overall Thermal Transfer Value) sebagai Pendekatan Arsitektur Hemat Energi pada Selubung Bangunan Museum Kota Makassar." Jurnal Ilmu Pengetahuan dan Teknologi 8, no. 2 (2024): 7–11. https://doi.org/10.31543/jii.v8i2.341.

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Salah satu bentuk pendekatan dalam penerapan konsep arsitektur hemat energi adalah dengan menganalisis OTTV pada selubung bangunan guna mengetahui tingkat kenyamanan yang ada pada bangunan tersebut. Tujuan dari penelitian ini adalah untuk menghitung nilai OTTV (Overall Thermal Transfer Value) pada selubung bangunan Museum Kota Makassar sebagai pendekatan terhadap arsitektur hemar energi. Metode yang digunakan pada penelitian ini yaitu metode kuantitatif dengan menghitung nilai OTTV menyesuaikan rumus sesuai dengan sumber literatur. Dari hasil penelitian ditemukan bahwa nilai OTTV pada selubung bangunan Museum Kota Makassar mempunyai angka yang sangat jauh dari standar SNI yaitu 45 45 Watt/m2. Oleh karena nya, diperlukan intervensi yang tepat agar bisa menerapkan konsep aristektur hemat energi pada Museum Kota Makassar.
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Fitria Syafutri, Rissa, Jatmika Adi Suryabrata, and Yani Rahmawati. "Developing The Building Envelope Thermal Transfer Value Calculator Based on BIM-VPL Framework." International Journal of Application on Sciences, Technology and Engineering 1, no. 1 (2023): 343–49. http://dx.doi.org/10.24912/ijaste.v1.i1.343-349.

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The use of formula to calculate OTTV (Overall Thermal Transfer Value) for buildings in Indonesia is written in the SNI (Indonesia National Standard) 6389:2020 document. There are at least 3 equations and 7 tables that require to refer for calculating the thermal transfer value of the building envelope. The series of formulas is quite time consuming and prone to human error if it is done repeatedly at the building design stage. This study aims to develop an OTTV formula based on the SNI 6389:2020 so that the OTTV calculation process can be carried out more effectively. The formula development process has done using the Autodesk Revit 2019 and Autodesk Dynamo 2.2 applications. From the studies that have been conducted, 11 scripts were written to calculate OTTV semi-automatically.
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Dissertations / Theses on the topic "Overall thermal transfer value (OTTV )"

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Kumari, Epa. "Analysis of Building Envelops to Optimize Energy Efficiency as per Code of Practice for Energy Efficient Buildings in Sri Lanka - 2008." Thesis, KTH, Tillämpad termodynamik och kylteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117984.

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Residential and commercial buildings consume approximately 20% of the global energy generation. This value is continuously growing and the governments across the globe have realized the importance of regulating the building construction to optimize the energy utilization. Energy efficient building codes have been developed to optimize the energy efficiency in buildings. OTTV (Overall Thermal Transfer Value) is a key parameter for evaluating energy efficiency of building envelops in the present building code of Sri Lanka. In this research, the prescriptive requirements mentioned in the building code for the building envelops to optimize the energy efficiency of five (05) commercial buildings has been analyzed. The indoor climate was modeled and the annual cooling energy variation with Overall Thermal Transfer Value was studied using “DesignBuilder” software. A cost benefit analysis was carried out for enhanced energy efficiency building envelops applications. It was attempted to develop a general relationship between the OTTV and annual cooling energy requirement for each building. It has been observed that a second order polynomial relationship with R2 of 0.861 exists for RDA building, linear relationship with R2 of 0.838 exists for AirMech building. However a specific relationship could not be observed for BMICH, SLSI and WTC buildings. The impact on cooling energy requirement from envelop parameter modification is unique for each building. In some instances the reduction of OTTV has not resulted in any reduction of the cooling energy requirement. There is a combined effect from each building component which affects the final cooling energy requirement. A simulation based technique to be used to find the optimum building envelops design.
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Book chapters on the topic "Overall thermal transfer value (OTTV )"

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Vijayalaxmi, J., and Priyanka Jaiswal. "Assessment of Indoor Heat Gain Using Overall Thermal Value (OTTV) in the Rural Houses of Andhra Pradesh, India." In Innovative Renewable Energy. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04714-5_14.

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Lu, Huaichang, Tao Zhou, Wenbin Liu, et al. "Research of Steady-State Heat Transfer Performance of Heat Pipe Inside Mobile Heat Pipe Reactor." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_64.

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AbstractHigh-temperature heat pipe is an important element in a mobile heat pipe reactor, and the study of the steady-state heat transfer performance of the heat pipe is of great value to the design and safe application of the heat pipe. Based on COMSOL software, a three-dimensional heat pipe model is established to study the effects of the input power of the evaporative section of the heat pipe and the horizontal acceleration of the heat pipe due to its movement on the heat transfer performance of the potassium heat pipe in steady-state operation. The results show that the overall temperature of the outer wall surface of the heat pipe and the axial temperature variation of the center of the heat pipe are less affected by the horizontal acceleration and more affected by the input thermal power within the study range; the thermal resistance of the heat pipe decreases with the increase of the input power of the evaporation section of the heat pipe, and shows a trend of decreasing and then increasing with the increase of the horizontal acceleration.
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Jonath, Lucas, Jörg Luderich, Jonas Brezina, Ana Maria Gonzalez Degetau, and Selim Karaoglu. "Improving the Thermal Behavior of High-Speed Spindles Through the Use of an Active Controlled Heat Pipe System." In Lecture Notes in Production Engineering. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-34486-2_16.

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AbstractThe thermo-elastic behavior of high-speed spindles has a significant influence on the machine accuracy. The Tool Center Point (TCP) changes continuously, not only due to the different temperature levels and energy inputs during warm-up, full-load and part-load operation, but also during interruptions for workpiece or tool changes. In this paper a heat pipe based tempering system is presented to control the spindle temperature and thus to keep the TCP displacement at a constant level, regardless of speed and load. As effective passive heat transfer components, heat pipes can be used not only to cool the system but also to insert heat into it. This capability of reversing the heat flow enables a high controllability of the temperature field in a bidirectional way and allows innovative capabilities of using advanced control algorithms. This paper describes the overall heat pipe concept and focuses on its potential as a key element for dynamic temperature control systems. Experimental results prove the feasibility of the concept with a simple on-off controller, achieving the reduction of the TCP displacement variation of a 2.2 kW spindle by 62% of its original value. The potential of the tempering concept forms the base for the deployment of various advanced control systems, such as Model-based Predictive Control (MPC), Fuzzy or Reinforcement Learning.
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Wah Sang, Wong. "Chapter 10 An Investigation On Overall Thermal Transfer Value." In Building Hong Kong. Hong Kong University Press, 2000. https://doi.org/10.1515/9789882200494-014.

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Conference papers on the topic "Overall thermal transfer value (OTTV )"

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Kristinayanti, W. S., I. G. A. I. Mas Pertiwi, I. K. Sudiarta, I. G. M. Oka Aryawan, I. A. P. Sri Wulandika, and P. Angga Bujana. "Evaluation of overall thermal transfer value (OTTV) calculation in building construction." In THE 2ND NATIONAL CONFERENCE ON MATHEMATICS EDUCATION (NACOME) 2021: Mathematical Proof as a Tool for Learning Mathematics. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0118054.

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Gbenga, Ayegbusi Olutobi, Abdullah Sani Ahmad, Yaik Wah Lim, and Dilshan Remaz Ossen. "Understanding Overall Thermal Transfer Value as a Building Energy Efficiency Indicator." In 1st Annual International Conference on Urban Planning and Property Development (UPPD 2015). Global Science & Technology Forum (GSTF), 2015. http://dx.doi.org/10.5176/2425-0112_uppd15.14.

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Thompson, M. K. "Finite Element Modeling of Multi-Scale Thermal Contact Resistance." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52385.

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Many traditional macro scale finite element models of thermal contact systems have incorporated the effect of micro scale surface topography by applying a constant value of thermal contact conductance (TCC) per unit area to the regions in contact. However, it has been very difficult to determine an appropriate TCC value for a given system and analysts typically had to rely on experimental data or values from the literature. This work presents a method for predicting micro scale TCC per unit area by incorporating micro scale surface roughness in a multi-scale iterative thermal/structural finite element contact model. The resulting TCC value is then used in a macro scale thermal/structural contact model with apparent surface form to predict the thermal contact resistance and overall thermal resistance for a commercial power electronics module.
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Sourbron, Maarten G., and Nesrin Ozalp. "Determination of Heat Transfer Characteristics of Solar Thermal Collectors as Heat Source for a Residential Heat Pump." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51461.

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One of the best ways of making efficient use of energy in residential units is to use heat pump. Heat pump performance can be further enhanced by integrating a solar thermal unit to provide hot water and subsidize space heating. This paper presents numerically examined energy feasibility study of a solar driven heat pump system for a low energy residence, where a flat plate solar collector served as the sole low temperature heat source. A parametric study on the ambient-to-solar fluid heat transfer coefficient has been conducted to determine the required solar collector heat transfer characteristics in this system. Solar collector area and storage tank volume were varied to investigate their impact on the system performance. A new performance indicator availability was defined to assess the contribution of the solar collector as low temperature energy source of the heat pump. Results showed that the use of a solar collector as low temperature heat source was feasible if its heat transfer rate (UA-value) was 200 W/K or higher. Achievement of this value with a realistic solar collector area (A-value) required an increase of the overall ambient-to-solar fluid heat transfer coefficient (U-value) with a factor of 6 to 8 compared to the base case with only natural convection heat exchange between solar collector cover and ambient.
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Jamieson, Harvey, Alex Stanning, Matthew Legge, and Ratnam Sathananthan. "Pipe-in-Pipe Thermal Management System With Adjustable U-Value During Field Life." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-63123.

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Abstract This paper details a new flowline thermal performance control system in which the overall heat transfer coefficient (U-value) of a pipe-in-pipe system can be varied. Large scale physical testing was carried out as part of the technology qualification to verify the system and design models developed. The solution is ideally suited for the increasing numbers of High Pressure High Temperature (HPHT) field developments being made; where the fluid temperature, pressure and flowrates will change significantly over the field life. It allows a new approach to flowline thermal design and operation to be taken for various types of field development. A qualification program has been performed with independent verification body assessment of the work and results and confirms the predicted performance. This paper describes the qualification method to DNVGL-RP-A203 and associated Technology Readiness Level (TRL) assessment of the components. The physical design of the system is presented along with examples of how benefits can be realised through its use.
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Fleischer, Amy S., and Randy D. Weinstein. "An Experimental Investigation of the Thermal Interaction of Electro-Optical Components on a Printed Circuit Board in Natural and Forced Convection." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47376.

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The thermal interaction of an electrical and an optical component located on the same vertical circuit board is studied experimentally. The effects of component proximity and convective flow rate on overall power dissipation from each component are analyzed. The components are represented by isothermal heat sources mounted to a standard 1.59mm (0.0625 in) thick FR4 circuit board. In natural convection situations, when the spacing between components is great enough that the component thermal footprints do not interfere, the power dissipation reaches a maximum “plateau” value that is independent of spacing. If the components are located close enough together that their thermal footprints interfere then the total power dissipation is highly dependent on component spacing (relative location of the electrical source and the geometric positioning of both sources). In forced convection, the total power dissipated increases with both Reynolds number and component spacing. As in natural convection, the relative location of the electrical sources and the positioning of the sources are found to have a strong influence on power dissipation.
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Tse, Louis A., Richard E. Wirz, and Adrienne S. Lavine. "Optimal Operation Strategies for Thermal Energy Storage Systems in Solar Thermal Power Plants." In ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49053.

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This paper examines the economic benefits of various operation strategies for a thermal energy storage (TES) system in a solar thermal power plant. A thermodynamic model developed to evaluate different design options has been utilized to calculate system performance and assess the impact of operation strategies, storage capacity, and market prices on the value of TES. The overall performance is also investigated through several parametric studies, such as solar multiple, geographic location, and choice of HTF. The influence of these parameters has been evaluated in consideration of exergy destruction due to heat transfer and pressure drop. By incorporating exergy-based optimization alongside traditional energy analyses, the results of this study evaluate the optimal values for key parameters in the design and operation of TES systems, as well as highlight opportunities to minimize thermodynamic losses. Annual performance for each case is characterized both by nominal and part-load efficiency. Levelized cost of electricity (LCOE) is calculated for all cases, illustrating a set of optimal parameters that yield a minimum LCOE value.
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Hu, Xuejiao, Lawrence S. Pan, Gang Gu, and Kenneth E. Goodson. "Superior Thermal Interfaces Made by Metallically Anchored Carbon Nanotube Arrays." In ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability. ASMEDC, 2009. http://dx.doi.org/10.1115/interpack2009-89375.

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Vertically aligned carbon nanotube arrays (CNAs) have received much interest for thermal interface applications due to the extremely high thermal conductivity of carbon nanotubes (CNTs) and the compliant mechanical properties of the CNA film. The challenge has been the big contact thermal resistance between the CNA tips and the opposing surface, which has resulted in the overall thermal performance of CNA TIMs far below expectation. We developed a process to metalize the CNA tips, and then firmly weld the tips to the back side metal of the SiO2/Si substrates using indium solder. We achieved close to 1 mm2K/W total interface thermal resistance (1.4 mm2K/W estimated from infrared thermal microscopy and 1.3±0.3 mm2K/W measured using a 3-omega method) with nearly zero compression pressures. This thermal resistance value is about one order of magnitude smaller than that of the thermal interfaces used for the state-of-the-art microprocessors.
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Farima, Daniela, Antonela Curteza, and Valentin Buliga. "SOFTWARE APPLICATION CALCULATING THE THERMAL PROPERTIES OF CLOTHING." In eLSE 2015. Carol I National Defence University Publishing House, 2015. http://dx.doi.org/10.12753/2066-026x-15-267.

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In order to ensure the overall thermal comfort of the human body, one must make sure that a constant balance is maintained between the processes of thermogenesis and thermolysis. Therefore, the quantity of heat produced within our bodies in a given period of time must be equal to the quantity lost by various means (conduction, convection, evaporation, radiation) in the same time interval. Much of the heat that the human body generates is lost through clothing; thus, one should pay attention when choosing apparel products in order to make sure that the clothing maintains an adequate thermal balance. Calculating the thermal properties of clothing structure consists in determining the value of the total thermal transfer coefficient Kimp (Kcal/m2hoC), and the value of the thermal resistence coefficient Rimp (m2hoC/Kcal). The determining algorythm is complex and time-consuming. This paper proposes a software application that consists of a data basis in which a range of activities are specified (sleeping, standing, light work, moderate work, hard work, walking etc.), with certain values for: the amount of heat lost by the human body while undergoing these activities U(Kcal/h), environment temperature (oC), body height (cm) and weight (Kg). When the user selects the type of activity and the specific body indicators, the application automatically displays the amount of heat lost through clothing by means of thermal flow q(Kcal/m2hoC), total thermal transfer coefficient Kimp (Kcal/m2hoC), thermal yield indices, thermo-isolation capacitance indices, and the value of heat resistance imposed for the clothing structure Rimp (m2hoC/Kcal). By using another software application for calculating the heat transfer taking place within a clothing assembly, it can be calculated the thermal resistance values Rcalc (m2hoC/Kcal) and the total thermal transfer coefficient Kcalc (Kcal/m2hoC) for a fezable item suited for the designated activity. By comparing the calculated values of thermal resistance for the clothing items to those imposed by the body state, it can be concluded whether the said items correspond to their intended purposes or not. The smaller the difference between Rcalc (m2hoC/Kcal) Rimp (m2hoC/Kcal), the better the choice of clothing for the designated activity of the human body is.
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10

Ait-Ali, Mohand A. "A Generalized Ecological, Internally Irreversible Carnot Cycle Model, as an Optimum Compromise Between Maximum Power and Efficiency for a Given Heat Transfer Inventory." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44503.

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A generalization of the so-called ecological cycle introduced by Angulo-Brown for the endoreversible maximum power problem of Curzon-Ahlborn is presented here under the assumption of arithmetic mean temperature differences and Newtonian heat transfer in heat exchangers, but with internal irreversibility and a variable heat transfer entropy penalization factor of maximum power to be produced. This presentation extends that given recently for a case study of an ecological non endoreversible Curzon-Ahlborn cycle, and more recently by this author for general rules of heat conductance allocations in endoreversible and irreversible Carnot like power or refrigeration cycles, and cascades of such cycles. Analytical results are obtained here in terms of heat source and sink temperature ratio, internal irreversibility factor, and ecological entropy penalization factor X defined as the number of times the energy equivalent entropy produced through heat transfer is subtracted from power generated per unit overall heat conductance. The value of X to design for in a given case study will dependent admittedly, on the respective capital cost and expected fuel cost of the particular power cycle to be retained. Finally, a newly defined ratio of maximum power produced to heat rejected by the cycle is presented as an ecology friendly parameter.
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Reports on the topic "Overall thermal transfer value (OTTV )"

1

VanderGheynst, Jean, Michael Raviv, Jim Stapleton, and Dror Minz. Effect of Combined Solarization and in Solum Compost Decomposition on Soil Health. United States Department of Agriculture, 2013. http://dx.doi.org/10.32747/2013.7594388.bard.

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In soil solarization, moist soil is covered with a transparent plastic film, resulting in passive solar heating which inactivates soil-borne pathogen/weed propagules. Although solarization is an effective alternative to soil fumigation and chemical pesticide application, it is not widely used due to its long duration, which coincides with the growing season of some crops, thereby causing a loss of income. The basis of this project was that solarization of amended soil would be utilized more widely if growers could adopt the practice without losing production. In this research we examined three factors expected to contribute to greater utilization of solarization: 1) investigation of techniques that increase soil temperature, thereby reducing the time required for solarization; 2) development and validation of predictive soil heating models to enable informed decisions regarding soil and solarization management that accommodate the crop production cycle, and 3) elucidation of the contributions of microbial activity and microbial community structure to soil heating during solarization. Laboratory studies and a field trial were performed to determine heat generation in soil amended with compost during solarization. Respiration was measured in amended soil samples prior to and following solarization as a function of soil depth. Additionally, phytotoxicity was estimated through measurement of germination and early growth of lettuce seedlings in greenhouse assays, and samples were subjected to 16S ribosomal RNA gene sequencing to characterize microbial communities. Amendment of soil with 10% (g/g) compost containing 16.9 mg CO2/g dry weight organic carbon resulted in soil temperatures that were 2oC to 4oC higher than soil alone. Approximately 85% of total organic carbon within the amended soil was exhausted during 22 days of solarization. There was no significant difference in residual respiration with soil depth down to 17.4 cm. Although freshly amended soil proved highly inhibitory to lettuce seed germination and seedling growth, phytotoxicity was not detected in solarized amended soil after 22 days of field solarization. The sequencing data obtained from field samples revealed similar microbial species richness and evenness in both solarized amended and non-amended soil. However, amendment led to enrichment of a community different from that of non-amended soil after solarization. Moreover, community structure varied by soil depth in solarized soil. Coupled with temperature data from soil during solarization, community data highlighted how thermal gradients in soil influence community structure and indicated microorganisms that may contribute to increased soil heating during solarization. Reliable predictive tools are necessary to characterize the solarization process and to minimize the opportunity cost incurred by farmers due to growing season abbreviation, however, current models do not accurately predict temperatures for soils with internal heat generation associated with the microbial breakdown of the soil amendment. To address the need for a more robust model, a first-order source term was developed to model the internal heat source during amended soil solarization. This source term was then incorporated into an existing “soil only” model and validated against data collected from amended soil field trials. The expanded model outperformed both the existing stable-soil model and a constant source term model, predicting daily peak temperatures to within 0.1°C during the critical first week of solarization. Overall the results suggest that amendment of soil with compost prior to solarization may be of value in agricultural soil disinfestations operations, however additional work is needed to determine the effects of soil type and organic matter source on efficacy. Furthermore, models can be developed to predict soil temperature during solarization, however, additional work is needed to couple heat transfer models with pathogen and weed inactivation models to better estimate solarization duration necessary for disinfestation.
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