By William F. Mohs, Francis A. Kulacki
This short is aimed toward engineers and researchers thinking about the refrigeration undefined: particularly, these attracted to strength usage and process potency. The ebook provides what the authors think is the 1st complete frost melting learn related to all features of warmth and mass move. The volume’s description of in-plane and general electronic photos of frost progress and melting is usually targeted within the box, and the electronic research strategy deals a bonus over invasive dimension equipment. The scope of book’s assurance contains modeling and experimentation for the frost formation and melting procedures. the major sub-specialties to which the ebook are aimed contain refrigeration process research and layout, coupled warmth and mass move, and phase-change processes.
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Heat and Mass Transfer in the Melting of Frost
This short is geared toward engineers and researchers enthusiastic about the refrigeration undefined: particularly, these drawn to power usage and process potency. The ebook provides what the authors think is the 1st finished frost melting examine concerning all features of warmth and mass move.
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Additional info for Heat and Mass Transfer in the Melting of Frost
Sample text
The overall heat transfer coefficient determined by calibration test is, UAch ¼ Qch, c ; ðT1 À Tch Þ ð4:2Þ where Qch,c is the sensible heat added to the chamber during calibration, and T1 and Tch are the average exterior and interior air temperatures respectively. 2 Characterization of the Test Chamber 49 heat is estimated by the input power, P, and heat pumping efficiency of the thermoelectric module, ηTE, Qcp ¼ P Á ηTE : ð4:3Þ Heat addition by the humidifier is calculated by the change in air enthalpy across the device, Qhu ¼ V_ a ρa ðia, o À ia, i Þ; ð4:4Þ where V_ a is the volumetric flow rate, ρa is the average density, and ia,o and ia,i are the outlet and inlet moist air enthalpies respectively.
1 shows a plain half fin, which represents a single fin of a common evaporator. The fin is attached to a continuous base where heating is applied. The fin has a length L and a half-thickness w. A frost layer of thickness δ is bonded to the fin surface. The frost is constructed of interlacing ice crystals with internal air pockets and has a bulk porosity ε. There is some debate within the literature whether porosity varies within the frost layer, and our model is constructed such that effects of either a constant or variable porosity can be evaluated.
An effective diffusion coefficient, Dv,eff, can describe the diffusion in a porous frost structure (Na 2003), 00 mv ¼ ÀDv, eff ∂ρv : ∂y ð3:5Þ Generally it is assumed that the water vapor within the pores is saturated at the local frost interface temperature. 5) becomes, ∂ pv : ∂y RT 00 mv ¼ ÀDv, eff ð3:6Þ With local thermal equilibrium (Wiederhold 1997), the vapor pressure and can be determined by, i À Á h pv ¼ 6:1115 1:003 þ 4:18 Â 10À6 pt exp 22:452 T=272:55þT ð3:7Þ The effective diffusion coefficient is related to the bulk diffusion coefficient by the bulk porosity and tortuosity, Dv,eff/εDv, which describes the path through the porous structure.