Topic
Calorimeter
About: Calorimeter is a research topic. Over the lifetime, 5878 publications have been published within this topic receiving 77157 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, an isothermal calorimeter using the thermoelectric assemblies (TEAs) along with the temperature control and Kalman filter is used to measure the heat generation rate (HGR) of large format pouch type lithium-ion batteries as an example.
23 citations
11 Jun 2001
TL;DR: In this article, the authors compared five different heat flux sensors: a Garden gauge, a so-called heat flux microsensor HFM, a calorimeter probe, a transient probe and a sensor of tile material.
Abstract: Comparative heat flux measurements were performed in a high enthalpy flow field. Five different heat flux sensors were compared: a Garden gauge, a so-called "heat flux microsensor" HFM, a calorimeter probe, a transient probe and a sensor of tile material. Tests were carried out at two flow conditions with different specific enthalpies and for two model configurations. For stagnation point tests the model geometry was varied between a sphere of 100 mm diameter and flat faced cylinders of 50 mm and 100 mm in diameter with different edge radii. In addition to the stagnation point test configuration some flat plate tests were performed to extract the influence of extraneous radiation from the convective heating. Therefore the sensors were integrated in an insulation material to avoid any heat conduction to the water cooled flat plate model holder. Using the tile sensor heat flux rates were measured at surface temperatures up to 1500 K. The influence of the temperature and pressure dependency of the tile material properties on the heat flux rate is demonstrated. The data of the sensors confirm, that the extraneous radiation from the reservoir of high enthalpy facilities or hot surfaces of a re-entry vehicles has an influence on the measurement and has to be considered in the evaluation of measured data.
23 citations
TL;DR: In this article, the isobaric heat capacities of liquid n-dodecane were measured at temperatures from 313.15 to 373.15 K and at pressures up to 100 MPa using a calorimetric device based on a Calvet calorimeter (Setaram (280).
Abstract: Isobaric heat capacities of liquid n-dodecane were measured at temperatures from 313.15 to 373.15 K and at pressures up to 100 MPa using a calorimetric device based on a Calvet calorimeter (Setaram (280). These experimental data were used to perform a comparative study in order to choose, from among the great number of equations of state proposed in the literature, the most appropriate to calculate the isobaric heat capacity.
23 citations
TL;DR: This work shows that combined dose uncertainties of significantly less than 5% can be achieved with only modest modifications of current water calorimetry techniques and instruments.
Abstract: Water calorimetry is an established technique for absorbed dose to water measurements in external beams. In this paper, the feasibility of direct absorbed dose measurements for high dose rate (HDR) iridium-192 (192Ir) sources using water calorimetry is established. Feasibility is determined primarily by a balance between the need to obtain sufficient signal to perform a reproducible measurement, the effect of heat loss on the measured signal, and the positioning uncertainty affecting the source-detector distance. The heat conduction pattern generated in water by the Nucletron microSelectron-HDR 192Ir brachytherapy source was simulated using COMSOL MULTIPHYSICS software. Source heating due to radiation self-absorption was calculated using EGSnrcMP. A heat-loss correction k(c) was calculated as the ratio of the temperature rise under ideal conditions to temperature rise under realistic conditions. The calorimeter setup used a parallel-plate calorimeter vessel of 79 mm diameter and 1.12 mm thick front and rear glass windows located 24 mm apart. Absorbed dose was measured with two sources with nominal air kerma strengths of 38 000 and 21 000 U, at source-detector separations ranging from 24.7 to 27.6 mm and irradiation times of 36.0 to 80.0 s. The preliminary measured dose rate per unit air kerma strength of (0.502 +/- 0.007) microGy/(s U) compares well with the TG-43 derived 0.505 microGy/(s U). This work shows that combined dose uncertainties of significantly less than 5% can be achieved with only modest modifications of current water calorimetry techniques and instruments. This work forms the basis of a potential future absolute dose to water standard for HDR 192Ir brachytherapy.
23 citations
TL;DR: In this paper, two high pressure calorimeters have been developed to measure the latent heat of fusion of pure water (hexagonal ice-type I) at subzero temperature.
Abstract: In high pressure calorimetry the pressure change is used to obtain the desired phenomenon (i.e. phase change) at constant temperature. Two high pressure calorimeters have been developed to measure the latent heat of fusion of pure water (hexagonal ice-type I) at subzero temperature. Both calorimeters used a constant pressurisation rate produced with a high pressure pump driven by a step motor. The first calorimeter was a single cell calorimeter where mercury acted as the pressurisation fluid, while the second one was differential (two cells) and was pressurised with pentane. Both calorimeters gave high accuracy data of latent heat of fusion of pure water, which were determined taking into account that either the fluid used to pressurise or the pressurisation rate affected the calorimetric signal.
23 citations