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Heat Flow
Published in Samuel C. Sugarman, HVAC Fundamentals, 2020
Sensible heat is added to the conditioned space by conduction, convection, and radiation. Heat in the conditioned comes from conduction through exterior walls, interior walls, doors, floors, ceilings and roofs. There is also the heat released by people, lights, computers, and other equipment and heat from the outside air through ventilation and infltration and by solar radiation through windows and other transparent surfaces. Because heat always flows from a warm temperature to a colder temperature the term heat loss refers to heating loads and the term heat gain refers to cooling loads.
Electromagnetic Radiation and Remote Sensing
Published in Ni-Bin Chang, Kaixu Bai, Multisensor Data Fusion and Machine Learning for Environmental Remote Sensing, 2018
In general, the state of the atmosphere is determined by its energy budget, which is comprised of the solar and terrestrial radiation fluxes as well as the latent and sensible heat fluxes, all of which are related to EMR. Note that flux can be used to delineate longwave radiation, shortwave radiation or the total of shortwave and longwave radiation that is moving up or down in the earth system. While latent heat is related to changes in phase between gases, liquids, and solids, sensible heat is related to changes in temperature of an object or a gas without any change in phase. Broadly speaking, sensible heat is the radiative flux caused by conduction and convection. For instance, heat will be conducted into the atmosphere and then convection will follow when a warm front meets a cold front in the planetary boundary layer. Latent heat is also regarded as the heat moved up into the atmosphere by water evaporation and condensation processes. The rate of heat penetration into the soil depends on the thermal diffusivity, which is defined as the thermal conductivity divided by the heat capacity. In fact, the thermal conductivity stands for how well heat is conducted through the soil layer, and the heat capacity is related to how much heat it takes to increase the unitary temperature of the soil layer. The lower the value of the thermal diffusivity, the less the temperature rises further into the soil, and the higher the reflected radiation into the atmosphere. Net radiation in this context is the amount of energy actually added to the earth system.
Heat Migration
Published in Ludwlg Luckner, Wsewolod M. Schestakow, German Migrationsprozesse, Migration Processes in the Soil and Groundwater Zone, 2017
Ludwlg Luckner, Wsewolod M. Schestakow, German Migrationsprozesse
Heat is internal energy consisting of a potential component, embodied in the cohesion of molecules, and a kinetic component, the vibrational, translational, and rotational energy of molecules. Sensible heat increases proportional to temperature. Latent heat change is caused by a qualitative change of potential and kinetic energy during aggregate state changes. According to Equation 1.1, heat is the extensive state variable and temperature the intensive state variable, as shown in Figure 1.51.
Computational analysis for temperature separation and correlations prediction for dual-inlet-sections vortex tube
Published in Numerical Heat Transfer, Part B: Fundamentals, 2023
Ravi Kant Singh, Achintya Kumar Pramanick, Subhas Chandra Rana
The energy level in the substance depends on many factors along with temperature, such as specific heat and mass of substance, and it contributes to the energy content and sensible heat of a substance. Therefore, to calculate the appropriateness of VT in certain applications, it is important to estimate the cooling power capacity along with the cold exit temperature gradient. The cooling power is calculated to analyze the thermal performance of the counter flow VT. It relies on the temperature difference, mass flow rate, and specific heat and is given as
Melting temperature and enthalpy variations of phase change materials (PCMs): a differential scanning calorimetry (DSC) analysis
Published in Phase Transitions, 2018
Xiaoqin Sun, Kyoung Ok Lee, Mario A. Medina, Youhong Chu, Chuanchang Li
For a heat storage material, specific heat is one of the most important properties. It determines how much heat can be stored in a certain amount of substance in the form of sensible heat. Based on the measured heat flow, the specific heat was calculated using Equation (4), which states that the measured heat flow is proportional to the sample mass, specific heat and heating rate. where dH/dt is the heat flow; m is the sample mass; cp is the specific heat; and β is the heating rate.
Numerical analysis-based performance prediction in a direct evaporative cooler used for building cooling
Published in Journal of Building Performance Simulation, 2022
Sampath Suranjan Salins, Shiva Kumar, Ritu Kiran Kartik, S. V. Kota Reddy
From this, the convective heat transfer coefficient is calculated. Sensible heat removed from the air during the evaporation process for a differential element with area dA is calculated by Equation (7). Sensible heat is due to the change in the air temperature whereas latent heat is due to the water evaporation. Heat lost by the air is gained by the water.