CALCULATION OF INTERNAL THERMAL RESISTANCE OF WORKING BODIES OF PACKEDBED SENSIBLE AND LATENT HEAT STORAGES

• Main Authors: Ermuratschii V.V., Gritsay M.A
• Format: Article
• Language: English
• Published: Academy of Sciences of Moldova 2013-12-01
• Series: Problems of the Regional Energetics
• Subjects: a; Electro-thermal model
• Online Access: http://journal.ie.asm.md/assets/files/m71_2_267.pdf

The paper considers the problem of calculating values of the internal thermal resistance of a packed bed sensible and latent heat storages working bodies. The methodic calculation of this resistance for bodies with solid, liquid substance and phase-change materials is offered. Being based on the theory of a regular thermal mode, formulas for calculation of internal thermal resistance of the bodies having the form of a sphere, the cylinder and a paralle-lepiped are obtained. For bodies with liquid substance this resistance is in view of a wall of vessels and resistance of a boundary layer at natural convection of liquids. In the case of substances with a phase transition heat resistance zones with different states of aggregation shall be determined separately. Electro-thermal model contains of the four thermal resistances, two heat capacity and single voltage source. Internal thermal resistance of solids can be considered as a constant parameter. For bodies of liquid and phase change material internal thermal resistance depends on their thermal state. Therefore, these values should be determined in the calculation processes of their heating or cooling.