cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.18462/iir.pcm.2016.0016
title: Experimentation for the evaluation of aluminum foams for improving heat transfer in PCM thermal storages.

description: The latent heat absorption phenomenon associated with melting of a suitable Phase Change Material (PCM) can be an effective way to improve Thermal Energy Storage (TES) behaviour in many applications. However the most suitable PCMs to be used in HVAC systems find intrinsic limitations due to poor heat transfer capability. This work investigates the use of Aluminum foams as heat transfer medium to improve the overall heat transfer of paraffin waxes that can be possible PCMs to be implemented in hybrid sensible-latent water TESs. The design of a new experimental testing rig is here presented together with some preliminary simulation results obtained during the phase change process of paraffin waxes with melting temperatures around 45 °C, with and without metal foams, in a water thermal storage unit. The simulation results are presented in terms of loading and unloading times of the PCM with and without Al-foam so as to assess the effects of the porous medium on the overall heat transfer performance.
DOI: 10.18462/iir.pcm.2016.0009
title: Passive cooling potential of two different PCM cooling ceilings in the energy efficiency center.

description: In the Energy Efficiency Center – the new R&D building of the ZAE Bayern - two different PCM cooling ceiling types are installed and monitored in two office rooms. The ceilings are connected to a water circuit and can be used for heating or cooling. The PCM ceilings are prototypes which differ in the positioning of the PCM layer: ceiling type 1 with the PCM on top of and ceiling type 2 with the PCM below the water pipes. It was found, that cooling ceiling type 2 had a better thermal connection between PCM and room, nevertheless, the passive cooling power of the two different system designs was quite similar when measured as a function of the room globe temperature. Passive cooling powers of 10 to 15 W per m² PCM cooling ceiling area were measured for an operative room temperature of 26 °C.
DOI: 10.18462/iir.pcm.2016.0011
title: Monitoring of PCM-Systems for building applications.

description: ZAE Bayern coordinates and supervises two joint projects dealing with the monitoring of PCM-systems in buildings. Both projects focus on the energetic system performance as well as on comfort conditions and help the producers to get feedback about the systems acceptance. The first project showed the need for controlled measurements without user influence to acquire reliable systems data. However, measurements with user influence are essential to learn about the actual systems performance and the operation. That’s why the second project uses a monitoring concept with two phases:
 Phase 1: Monitoring without user influence (well defined boundary conditions)
 Phase 2: Monitoring with user influence (real boundary conditions)
DOI: 10.18462/iir.pcm.2016.0020
title: Measurements of standard seawater calls for minor adjustements of seawater ice slurry properties.

description: Seawater is the most common fluid on earth and ice generating machines are increasingly used on fishing vessels to produce ice slurry from the seawater with up to 60 % ice to be poured over the catch. In this study, new measurements of thermophysical properties of standard seawater have been carried out to complement a recent literature search made to establish thermophysical property data of seawater as function of salinity and temperature. These single-phase measurements have been made for salinity 20, 30 and 35 g . kg-1 (2.0, 3.0 and 3.5 % total salt content) and include measurements of freezing point, density, dynamic viscosity, thermal conductivity, specific heat capacity and specific enthalpy. The obtained experimental results generally confirm recent literature search and experimental results only call for minor adjustments of viscosity values. Hence, experimental results confirm the following published ice slurry properties: enthalpy, ice fraction and ice slurry density.
DOI: 10.4225/25/575f41e2d0a77
title: Intertidal Extents Model Confidence Layer

description: The Intertidal Extents Model (ITEM v1.0) product is a national scale gridded dataset characterising the spatial extents of the exposed intertidal zone, at intervals of the observed tidal range. The current version utilises all Landsat observations (5, 7, and 8) for Australian coastal regions (excluding off-shore Territories) between 1987 and 2015 (inclusive). The Intertidal Extents Model (ITEM v1.0) consists of three datasets derived from the Landsat NBAR data managed in the Australian Geoscience Data Cube (AGDC) for the period 1987 to 2015. The Confidence Layer (ITEM_CL_mosaic_1987_2015.tif) reflects the confidence level of the Relative Extents Model, based on the distribution of classification metrics within each of the 10% intervals of the tidal range. The layer should be used to filter region/pixels in the model where the derived spatial extents may be adversely affected by data and modelling errors. Note: The confidence layer should be utilised on a cell-by-cell basis. Standard deviation values within the confidence layer for a particular cell are not comparable to other cells within the model. Attributes: Single Band Integer Raster: 0 - Model is invalid. Indicates pixels where data quality and/or number of observations have resulted in no available observations in one or more of the percentile interval subsets. -32767 - No Data All other values - The pixel-based average of the NDWI standard deviations calculated independently for each 10% percentile interval of the observed tidal range (x 1000).
DOI: 10.18462/iir.pcm.2016.0018
title: Experimental analysis on a novel air heat exchanger containing PCM (Phase Change Material) in a cold room.

description: In the present work the performance of a cold room with a novel air heat exchanger containing PCM (Phase Change Material) was experimentally investigated. Specifically, an air heat exchanger consisting of aluminium containers with finned surface filled with PCM (5 °C melting temperature), was located near the evaporator of a cold room. The aims are to reduce cooling energy consumption and improving the maintenance thermal conditions of stored products. For this purpose, an experimental campaign was carried out and a monitoring system was developed. The cold room thermal behaviour, with and without PCM, was studied under steady state operating conditions. As expected a reduced number of on/off compressor cycles (6 cycles instead 13 cycles) in the PCM added cold room was observed. Test results showed that by storing PCM in the air heat exchanger, up to 16% of energy saving can be achieved.
DOI: 10.18462/iir.pcm.2016.0019
title: Particle sedimentation depression with stabilizers and surfactants on phase change materials.

description: The effect of the size of a combination structure of poly(ninyl alcohol) (PVA) as a stabilizer and drag-reducing surfactants in water on the sedimentation of particles of phase change materials (PCMs) in solutions was investigated. Behenyl trimethyl ammonium chloride was used as a surfactant with a 1.5 molar ratio of sodium salicylate as a counter-ion supplier at a constant surfactant concentration of 2,000 ppm in water, while the concentration of PVA was varied from 0 to 2,000 ppm. The structural size of the combined PVA and surfactant was measured with a dynamic light scattering (DLS) system. DLS analysis indicated that a large structure is formed by the interaction between PVA and surfactants. In addition, this structure becomes larger with the PVA concentration, and the occupation volume of the structure expands widely in a fluid. Thus, it was concluded that this large structure formation could cause an effective reduction of particle sedimentation in latent heat systems.
DOI: 10.18462/iir.pcm.2016.0022
title: Dynamic modelling of secondary refrigeration loop with CO2 hydrate slurry.

description: Secondary refrigeration is an often used solution to reduce the amount of refrigerant leakage and the impact of refrigerants on global warming. The use of two-phase fluids in refrigeration systems is known to increase the quantity of stored energy. In this work, the impact of gas hydrates on the energy release of a heat exchanger is quantified thanks to the dynamic modelling of a secondary refrigeration system. The system is composed of a chiller, a stirred tank reactor (hydrate formation), a loop and a heat exchanger (hydrate dissociation). The model validated by experimental data can be used to simulate various operating conditions in transient and permanent regimes (various slurry mass flow rate, various thermodynamic conditions) and to compare their energy performances. The numerical and experimental results showed better heat exchanger efficiency with hydrate slurry than with water alone.
DOI: 10.4225/25/575f47f34675d
title: Intertidal Extents Model Confidence Layer

description: The Intertidal Extents Model (ITEM v1.0) product is a national scale gridded dataset characterising the spatial extents of the exposed intertidal zone, at intervals of the observed tidal range. The current version utilises all Landsat observations (5, 7, and 8) for Australian coastal regions (excluding off-shore Territories) between 1987 and 2015 (inclusive). The Intertidal Extents Model (ITEM v1.0) consists of three datasets derived from the Landsat NBAR data managed in the Australian Geoscience Data Cube (AGDC) for the period 1987 to 2015. The Confidence Layer (ITEM_CL_mosaic_1987_2015.tif) reflects the confidence level of the Relative Extents Model, based on the distribution of classification metrics within each of the 10% intervals of the tidal range. The layer should be used to filter region/pixels in the model where the derived spatial extents may be adversely affected by data and modelling errors. Note: The confidence layer should be utilised on a cell-by-cell basis. Standard deviation values within the confidence layer for a particular cell are not comparable to other cells within the model. Attributes: Single Band Integer Raster: 0 - Model is invalid. Indicates pixels where data quality and/or number of observations have resulted in no available observations in one or more of the percentile interval subsets. -32767 - No Data All other values - The pixel-based average of the NDWI standard deviations calculated independently for each 10% percentile interval of the observed tidal range (x 1000).
DOI: 10.6073/pasta/1eb0f704ec34a5f682321a5bfad9c6de
title: McMurdo Dry Valleys Lake Bonney Meteorological Station Monthly Averages
DOI: 10.6073/pasta/26be5463623153540c0252666633ad80
title: McMurdo Dry Valleys Lake Bonney Meteorological Station Daily Averages
DOI: 10.6073/pasta/9bb1703a01bf43aa91539dc13fbfb080
title: McMurdo Dry Valleys Lake Bonney Meteorological Station Monthly Averages
DOI: 10.18462/iir.pcm.2016.0023
title: Impact of pressure on the dynamic behavior of CO2 hydrate slurry during storage process.

description: Two-phase fluids are considered as high-performance fluids for secondary refrigeration thanks to high energy density of phase change material (PCM). Nevertheless, one limitation in such system is thermal energy storage dynamic, in particular PCM charging/discharging rate, which depends generally on fluid temperature and flow rate. In the present work, the influence of pressure on the charging/discharging processes of gas hydrates has been studied experimentally using a stirred tank reactor. A model of stirred tank reactor was also developed and validated. The results showed that pressure can be used to adjust gas-hydrate phase-change temperature and consequently to improve charging/discharging time. For the same working conditions (temperature, flow rate, charging time…), the amount of stored energy using gas hydrates at 3 MPa is two times higher than that using water. The model was used to compare gas hydrates slurries to other slurries at ambient pressure.
DOI: 10.6073/pasta/2cac44dcd6f7cc4a63d950be1f8cb062
title: McMurdo Dry Valleys Lake Bonney Meteorological Station Measurements
DOI: 10.18462/iir.pcm.2016.0024
title: TBAB hydrate slurry based latent heat thermal storage system.

description: Latent heat thermal storage (LHTS) systems can be applied to minimize the discrepancy between energy supply and demand in cold applications. Combining this system with night time generation of TBAB hydrate slurry can significantly reduce the investment cost of systems for cooling purposes. TBAB hydrate slurry generation requires temperature around 12 °C, operates at atmospheric pressure and, from an energetic point of view, application of this slurry can contribute to significant energy savings. In this paper, a numerical model of a LHTS system is coupled with a hydrate crystal growth model, which has been validated with experimental data collected with a coil heat exchanger for TBAB hydrate generation. The model has been used for the estimation of the production of TBAB hydrate slurry in an air-conditioning system. Results indicate that with a certain volume of the LHTS system, it is possible to fulfil the considered 3 kW peak cooling demand for a specified office building without extra external energy input during the day. The presented work provides guidelines for the thermal performance and design optimization of a TBAB hydrate slurry based LHTS system for an air-conditioning system.
DOI: 10.18462/iir.pcm.2016.0025
title: Tool for the estimation of the melting enthalpy of PCM based on binary mixtures of salt + water.

description: Salt hydrates as phase change materials (PCM) are known for their high volumetric melting enthalpies and generally lower prices compared to organic PCM. However, obtaining a value for the melting enthalpy can prove to be difficult: while literature might not provide a(n) (accurate) value, determining the values experimentally can be time-consuming.
In the past, a theoretical model was developed to predict the melting entropies of salt hydrates. It is based on a linear relationship between the melting entropy of a salt hydrate and the number of moles of water of this salt hydrate. Here, this model is shown to be also valid in case of eutectic mixtures. Based on the model, a tool is defined which allows the estimation of the melting entropy and, hence, the melting enthalpy of a multitude of binary mixtures of salt + water.
DOI: 10.18462/iir.pcm.2016.0027
title: Optimization of the formulation of a phase change slurry.

description: Based on a formulation for a Phase Change Slurry (PCS) with 30 wt.% n-octadecane, 7 wt.% emulsifier with an Hydrophilic-Lypophilic-Balance (HLB) of 12 and a nucleating agent an optimization of the composition of the PCS was done. The HLB and the emulsifier concentration as well as the phase change material (PCM)-fraction were modified. An improvement was checked on the basis of the particle size distribution, the viscosity and the phase change behaviour in the differential scanning calorimeter (DSC). To proof thermal-mechanical stability of the emulsion it is cycled in the rheometer over its phase change at a shear stress of 100 1·s-1.
By changing the emulsifier concentration and the HLB of the emulsifiers it was possible to formulate PCSs showing low viscosities when cycling it over the phase change region. With the optimized formulation PCM-fractions of up to 45 wt.% of PCM were emulsified resulting in thermally-mechanically stable PCSs.
DOI: 10.13126/unical.it/dottorati/859
title: Il diritto fondamentale alla salute fra sistema interno di responsabilita' civile ed ordinamento comunitario

description: Dottorato di ricerca in Impresa, stato e mercato, XXII ciclo, a.a. 2009-2010
DOI: 10.14457/kmitl.the.2006.407
title: การศึกษาทดลองของการสูญเสียการแพร่กระจายคลื่นแถบความถี่กว้างยิ่ง ในสภาวะแวดล้อมภายในอาคาร /
DOI: 10.14457/kmitl.the.2006.408
title: การประเมินสมรรถนะของ ISMA ที่มีการชดเชยเวลา /
DOI: 10.18462/iir.pcm.2016.0006
title: Rheological investigations of paraffin based phase change slurry using a pipe viscosimeter.

description: In this work paraffin/water dispersions used as phase change slurries (PCS) for thermal energy storage systems have been investigated regarding their rheological behaviour. The fluids viscosity is an important parameter for dimensioning of the main peripheral components of storage systems like pumps, valves and piping. The experiments have been conducted with a pipe viscosimeter at different fluid temperatures, shear rates and varying paraffin fraction (25, 30 and 35 wt. %). The measurements show viscosity values between 2.8 and 27.7 mPa∙s depending on the set conditions. The paraffin/water dispersions show a shear thinning behaviour with a strong temperature dependency and a discontinuity during the phase change of the paraffin fraction. Consequently, reliable measurement results are now available to design technical systems based on such paraffin/water dispersions.
DOI: 10.18462/iir.pcm.2016.0007
title: Measurement of thermal conductivity and heat capacity of phase change materials with the longitudinal heat flow method.

description: Even though Differential Scanning Calorimetry (DSC) is a common method for the determination of specific heat capacity, there is also need for methods suitable for a larger specimen size in the range of several cubic centimeters instead of micro liters. For phase change materials or compounds which show specimen size dependent thermophysical caloric properties below a critical specimen volume, e.g. sub cooling effects, the larger specimen volumes are absolutely essential. The Longitudinal Heat Flow Method is a well-known steady state method to measure the thermal conductivity of medium sized solid samples. With a modification of the measurement procedure to a transient temperature step at the top and bottom end of the stack it is now possible to determine the heat capacity of a specimen in a defined temperature interval. An apparent heat flux is determined during the transient heating phase, which can be evaluated with a novel analytical model. Numerical simulations of this new measurement method are validated by experimental investigation of different materials.
DOI: 10.18462/iir.pcm.2016.0028
title: Experimental and analytical investigation of thermal energy storage system for automotive applications.

description: A latent heat energy storage device has been designed, constructed and tested to investigate the reduction of engine warm-up time by using phase change materials (PCMs) as a thermal energy storage (TES) medium. The aim of this work was to test the TES performance under low ambient temperatures well below 0 °C, which are often encountered in winter in many countries. A new TES device with vacuum insulation was designed to contain 1.43 kg of paraffin wax in small sealed aluminum cans, and 2.2 kg of an engine coolant which was circulated between the TES device and a 15 kg aluminum block simulating an engine block. Heat discharging tests were then conducted with all the components placed in a freezer set at -15 °C. The experiments showed that the TES device initially at 60 °C was able to heat up the aluminum block from -15 °C to about +10 °C in five minutes. An analytical model was also developed to simulate the heat transport process during the TES discharging experiment. The model predictions were compared with the experimental data to validate the model and optimize the model parameters. A sensitivity study was also performed using the simulation model to investigate the effects of various parameters such as the mass of engine block, fluid flow rate, and amount of paraffin wax contained in the TES device. Both the experimental and model simulation results demonstrated the promising potential of the latent heat-based TES device for cold engine warm-up during winter.
DOI: 10.14457/kmitl.the.2007.383
title: การประเมินโครงการฝึกอบรม หลักสูตรที่ปรึกษางานบริการชั้นต้น บริษัท มิตซูบิชิ มอเตอร์ [ประเทศไทย] จำกัด /
DOI: 10.14457/kmitl.the.2007.384
title: การบีบอัดข้อมูลภาพ ด้วยเวฟทรานส์ฟอร์ม และการเข้ารหัสภาพรูปแบบเสมือน /
DOI: 10.14457/kmitl.the.2007.385
title: การปรับปรุงภาพ ด้วยวิธีปรับเรียบฮีสโตแกรม เพื่อให้ได้ค่าเฉลี่ยความสว่างผิดพลาดต่ำสุด /
DOI: 10.18462/iir.pcm.2016.0004
title: Experimental analysis on rheological and heat transfer characteristics of paraffin/water emulsion.

description: Paraffin in water emulsions used as PCSs can theoretically provide an increase of the thermal storage capacity and high heat transfer characteristics. The aim of the present article is to report experimental results concerning both the rheological and heat transfer behavior of a paraffin/water emulsion. The results were obtained in a specific test bench: mainly consisting in a pair of symmetric cooled rectangular channels whose sizes are typical of plate heat exchangers. The local heat transfer coefficients along the fluid path during the crystallization of the paraffin are determined. The results demonstrate that an emulsion containing 30 %wt. paraffin has a Newtonian behavior. For laminar flow, the heat transfer coefficients of the emulsion are comparable to those for the single-phase fluid (water). Particular attention was given to the heat transfer phenomena: this led to the development of correlations for the local and overall Nusselt numbers that can be of practical interest when comparing the performances of a variety of fluids.
DOI: 10.18462/iir.pcm.2016.0005
title: Coupled effects of slurry rheology, heat transfers, and thermodynamics on performance of secondary refrigeration loops in steady-state operation.

description: Because of major global warming concern (refrigerant leaks in large direct refrigeration systems), secondary refrigeration should develop in the next future, especially when using slurries with strong energetic density. With gas-hydrate slurries the fusion temperature can be modified via the gas pressure; this is a new feature. In order to thermodynamically revisit the question, a numerical model of secondary refrigeration loops in steady-state operation has been developed. It includes the cooling unit, the heat-exchangers, the pumps, heat-dissipation's, and non-Newtonian effects on pressure drops and heat transfers. The whole system is sized while accounting for engineering constraints: prescribed cooling power, prescribed total heat-transfer areas, imposed degree of turbulence in the slurry flow so that crystal deposition and blockage are prevented while keeping acceptable pressure drops. CO2- and mixed CO2+TBPB hydrates, are compared to usual ones in terms of global electricity consumption and exergy losses. Global energetic performance mostly depends on fusion temperature of the slurry.
DOI: 10.14457/kmitl.the.2006.409
title: การพัฒนาบทเรียนคอมพิวเตอร์ช่วยสอน เพื่อการทบทวน วิชาวิศวกรรมไมโครเวฟ เรื่องสายอากาศในย่านความถี่ไมโครเวฟ สำหรับนักศึกษาระดับปริญญาตรี คณะครุศาสตร์อุตสาหกรรม สถาบันเทคโนโลยีพระจอมเกล้าเจ้าคุณทหารลาดกระบัง /
DOI: 10.14457/kmitl.the.2006.410
title: การจัดกลุ่มผลการสืบค้น ด้วยซัฟฟิกทรีคลัสเตอร์ริ่งแนวใหม่ /
DOI: 10.14457/kmitl.the.2007.386
title: การศึกษาและพัฒนารูปแบบผลิตภัณฑ์ หัตถกรรมเครื่องจักสาน จังหวัดพระนครศรีอยุธยา /
DOI: 10.18462/iir.iccc.2016.0047
title: Why is predicting kiwifruit quality in the cool chain so difficult?

description: To enable year round supply of seasonal products, such as kiwifruit, a portion of the harvested volume is cold stored. For kiwifruit, despite best efforts, a proportion of this cool stored stock’s quality diminishes to a point of being unsaleable resulting in fruit loss. Predicting the rate and extent of quality loss during storage in theory should be predictable based on knowledge of the at-harvest condition and time-temperature history of the stock, and applying a time-temperature-tolerance hypothesis. Unfortunately this has not proven to be the case with a number of factors contributing to proliferation of variability in the cool chain. This paper discusses evidential data for additional prediction complications introduced by grower line differences, cooling rate, storage temperature and ethylene concentration. Only when each of these effects can be measured and described will kiwifruit quality be able to be adequately predicted and hence industry storage losses reduced.