Thermal Capacity of Hog-Cooling Pad

2017 ◽  
Vol 33 (6) ◽  
pp. 891-899 ◽  
Author(s):  
Francisco A. Cabezon ◽  
Allan P. Schinckel ◽  
Robert M. Stwalley III
Keyword(s):  
Experimental Investigation ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Thermal Response ◽  
Thermal Capacity ◽  
External Heat ◽  
Thermally Induced ◽  
Induced Stress ◽  
Heat Loading ◽  
Convection Cooling

Abstract. Modern hog farrowing operations have reached a state in which the environmental conditions necessary for piglets are vastly different than those required by sows. A hog-cooling pad has been developed by Purdue University researchers to alleviate thermally-induced stress in the sow. Understanding the basic thermal properties of the device is critical to the development of the technology, and this article documents the experimentation performed on the unit to measure some of those characteristics. A preliminary experimental investigation into the thermal response of the device with no external heat loading under a variety of coolant flow and temperatures is presented. The sow-cooling panel reacts as a Newtonian convective device and provides a uniform top surface temperature. The results indicate that device is highly conductive to the top panel and reasonably well insulated from the environment. Keywords: Convection, Cooling, Farrowing, Heat capacity, Swine, Thermal response.

Detection of Thermal Transport on Chip Using Gate-Induced Drain Leakage Current

2020 ◽  
Vol 20 (8) ◽  
pp. 4980-4984
Author(s):  
Nak Won Yoo ◽  
Seoungwook Choi ◽  
Jun Yeon Yun ◽  
Young June Park
Keyword(s):  
Heat Capacity ◽  
Thermal Properties ◽  
Leakage Current ◽  
Thermal Transport ◽  
Thermal Response ◽  
Wave Form ◽  
Thermal Sensor ◽  
Sinusoidal Wave ◽  
On Chip ◽  
Small Overlap

In this paper, we propose a method to detect thermal transport suitable in nanometers scale. It is feasible using the GIDL-biased MOSFET as thermal sensor. It is because the GIDL current is occurred due to the band-to-band tunnelling of the electron in a small overlap region between gate and drain. Using the relation between the thermal transport and the thermal properties (the heat resistivity and heat capacity), we conducted two ways to heat up. By generating heat in the step and sinusoidal wave form with a transistor and observing the response at other place, we were able to estimate the speed of heat on the chip. The thermal response is measured by the GIDL current of another MOSFET. The speed of the heat generated at the MOSFET is measured about 2.12 m/s.

Free and Forced Air Precooling of Perishable Food Products: Experimental Investigation

2020 ◽  
Vol 12 (4) ◽  
pp. 517-523
Author(s):  
Taliv Hussain ◽  
Shahzeb Ansari
Keyword(s):  
Thermal Conductivity ◽  
Experimental Investigation ◽  
Heat Capacity ◽  
Thermal Diffusivity ◽  
Free Convection ◽  
Forced Convection ◽  
Food Products ◽  
Convection Cooling ◽  
Forced Air ◽  
Thermo Physical Properties

An experimental investigation has been performed in order to compare the thermo-physical properties of spherical and cylindrical shaped food products during forced and free convection cooling. The specific heat capacity increases with the increment in the percentage of moisture quantity as in cucumber, it was 96% and in banana, it was 74%. The thermal conductivity of cucumber was found to be 18.7%, 7.6%, 5.1% more than that of banana, orange, capsicum respectively in case of free convection cooling but it was 18.7%, 7.8%, 5.3% more than that of banana, orange, capsicum respectively in case of forced convection cooling. In free convection cooling, the value of thermal diffusivity of cucumber was noted to be 9.02%, 2.96%, 3.85% more than that of banana, orange, capsicum respectively while in case of forced convection cooling, it was 76.06%, 62.62%, 20.19% more than that of banana, orange, capsicum respectively.

On Experimental Thermal Analysis of BMC Mensolite 3100 Aging

2020 ◽  
Vol 399 ◽  
pp. 129-136
Author(s):  
Pavol Koštial ◽  
Jozef Vlček ◽  
Zora Koštialová Jančíková ◽  
Ivan Ružiak ◽  
Milada Gajtanska ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Analysis ◽  
Heat Capacity ◽  
Thermogravimetric Analysis ◽  
Thermal Treatment ◽  
Thermal Capacity ◽  
Irradiation Effect ◽  
Thermally Induced ◽  
Starting Point ◽  
Virgin Sample

The paper is devoted to the study of thermal parameters (specific heat capacity, diffusivity and thermal conductivity) changes after thermally induced aging of BMC Mensolite 3100. Results of several measurements are statistically treated. From obtained results it is visible the greatest correlation in the diffusivity values, i.e. the heat irradiation effect is the smallest on the diffusivity values dispersion, the influence of the heat irradiation on the thermal capacity has approximately the same trend as the thermal conductivity. From the starting point represented by the virgin sample both values decrease and for the sample heated at 300°C it is visible an increase of the above mentioned values under investigation. Results are interpreted by using of the thermogravimetric analysis (TGA). All physical values under this investigation have a dominant decreasing tendency after the thermal treatment described.

scholarly journals Continental vs. Global Niche-Based Modelling of Freshwater Species’ Distributions: How Big Are the Differences in the Estimated Climate Change Effects?

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 816
Author(s):  
Danijela Markovic ◽  
Jörg Freyhof ◽  
Oskar Kärcher
Keyword(s):  
Climate Change ◽  
Thermal Properties ◽  
Safety Margin ◽  
Thermal Response ◽  
Future Climate Change ◽  
Freshwater Species ◽  
Response Curves ◽  
Preferred Temperature ◽  
Continental Scale ◽  
Management Actions

Thermal response curves that depict the probability of occurrence along a thermal gradient are used to derive various species’ thermal properties and abilities to cope with warming. However, different thermal responses can be expected for different portions of a species range. We focus on differences in thermal response curves (TRCs) and thermal niche requirements for four freshwater fishes (Coregonus sardinella, Pungitius pungitius, Rutilus rutilus, Salvelinus alpinus) native to Europe at (1) the global and (2) European continental scale. European ranges captured only a portion of the global thermal range with major differences in the minimum (Tmin), maximum (Tmax) and average temperature (Tav) of the respective distributions. Further investigations of the model-derived preferred temperature (Tpref), warming tolerance (WT = Tmax − Tpref), safety margin (SM = Tpref − Tav) and the future climatic impact showed substantially differing results. All considered thermal properties either were under- or overestimated at the European level. Our results highlight that, although continental analyses have an impressive spatial extent, they might deliver misleading estimates of species thermal niches and future climate change impacts, if they do not cover the full species ranges. Studies and management actions should therefore favor whole global range distribution data for analyzing species responses to environmental gradients.

scholarly journals Testing a Gypsum Composite Based on Raw Gypsum with a Direct Admixture of Paraffin and Polymer to Improve Thermal Properties

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3241
Author(s):  
Krzysztof Powała ◽  
Andrzej Obraniak ◽  
Dariusz Heim
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Phase Change ◽  
Large Scale ◽  
Building Materials ◽  
Residential Buildings ◽  
Energy Performance ◽  
Polymer Content ◽  
Volumetric Heat Capacity

The implemented new legal regulations regarding thermal comfort, the energy performance of residential buildings, and proecological requirements require the design of new building materials, the use of which will improve the thermal efficiency of newly built and renovated buildings. Therefore, many companies producing building materials strive to improve the properties of their products by reducing the weight of the materials, increasing their mechanical properties, and improving their insulating properties. Currently, there are solutions in phase-change materials (PCM) production technology, such as microencapsulation, but its application on a large scale is extremely costly. This paper presents a solution to the abovementioned problem through the creation and testing of a composite, i.e., a new mixture of gypsum, paraffin, and polymer, which can be used in the production of plasterboard. The presented solution uses a material (PCM) which improves the thermal properties of the composite by taking advantage of the phase-change phenomenon. The study analyzes the influence of polymer content in the total mass of a composite in relation to its thermal conductivity, volumetric heat capacity, and diffusivity. Based on the results contained in this article, the best solution appears to be a mixture with 0.1% polymer content. It is definitely visible in the tests which use drying, hardening time, and paraffin absorption. It differs slightly from the best result in the thermal conductivity test, while it is comparable in terms of volumetric heat capacity and differs slightly from the best result in the thermal diffusivity test.

scholarly journals Multidisciplinary Approaches for Assessing a High Temperature Borehole Thermal Energy Storage Facility at Linköping, Sweden

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4379
Author(s):  
Max Hesselbrandt ◽  
Mikael Erlström ◽  
Daniel Sopher ◽  
Jose Acuna
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Thermal Response ◽  
Site Investigation ◽  
Thermal Response Test ◽  
Response Test ◽  
Crystalline Bedrock

Assessing the optimal placement and design of a large-scale high temperature energy storage system in crystalline bedrock is a challenging task. This study applies and evaluates various methods and strategies for pre-site investigation for a potential high temperature borehole thermal energy storage (HT-BTES) system at Linköping in Sweden. The storage is required to shift approximately 70 GWh of excess heat generated from a waste incineration plant during the summer to the winter season. Ideally, the site for the HT-BTES system should be able to accommodate up to 1400 wells to 300 m depth. The presence of major fracture zones, high groundwater flow, anisotropic thermal properties, and thick Quaternary overburden are all factors that play an important role in the performance of an HT-BTES system. Inadequate input data to the modeling and design increases the risk of unsatisfactory performance, unwanted thermal impact on the surroundings, and suboptimal placement of the HT-BTES system, especially in a complex crystalline bedrock setting. Hence, it is crucial that the subsurface geological conditions and associated thermal properties are suitably characterized as part of pre-investigation work. In this study, we utilize a range of methods for pre-site investigation in the greater Distorp area, in the vicinity of Linköping. Ground geophysical methods, including magnetic and Very Low-Frequency (VLF) measurements, are collected across the study area together with outcrop observations and lab analysis on rock samples. Borehole investigations are conducted, including Thermal Response Test (TRT) and Distributed Thermal Response Test (DTRT) measurements, as well as geophysical wireline logging. Drone-based photogrammetry is also applied to characterize the fracture distribution and orientation in outcrops. In the case of the Distorp site, these methods have proven to give useful information to optimize the placement of the HT-BTES system and to inform design and modeling work. Furthermore, many of the methods applied in the study have proven to require only a fraction of the resources required to drill a single well, and hence, can be considered relatively efficient.

Sign in / Sign up

Export Citation Format

Share Document