Lub teeb yuag qhob ntxiv | Kev Ua Haujlwm Siab Ua Foaming Cov Neeg Sawv Cev Rau Cov Khoom Siv Ntawm Tes
The difference in heat transfer between foam concrete insulation board and organic foam insulation board:
(1) Radiation heat transfer. As far as radiant heat transfer is concerned, it is only related to the temperature difference and the structure and characteristics of the material, and the structure and features of the article mainly refer to the transmission and reflection performance of heat radiation, which is also related to the color depth and surface state of the content. The color of the foam concrete insulation board is darker than that of the organic foam board. Microscopically, the former is more comfortable to crystallize than the latter, and the surface roughness must be lower than the latter. It is difficult to judge the level of heat transfer capacity of the two heat radiation.
(2) Conduction heat transfer. As far as conduction heat transfer is concerned, it is only related to the temperature difference and the nature of the material. As far as the quality of the content is concerned, the constituent elements of foamed concrete are Si, 0, Ca, H and some other metal elements, all of which exist in compound form, There are no free electrons that can quickly transfer heat; the constituent parts of organic foam insulation boards are C, H, and N. These elements also exist in the form of compounds, and there is no free electron that can quickly transfer heat. The difference lies in the chemical bond. Different, it can be seen that the heat conducted by the two thermal insulation materials is intensified by the vibration of heated atoms and transferred through chemical bonds. Ordinarily, kom tau txais tib lub zog, qhov siab ntawm kev co ntawm ib qho particle loj feem ntau tsawg dua li ntawm ib qho hmoov me me. Hauv qhov no, kev coj cua sov ntawm daim board rwb thaiv tsev pob zeb npuas yuav tsum tsawg dua daim board ua npuas organic.
(3) Kev hloov cua sov convection. Hais txog kev hloov cua sov convective, yog tias qhov chaw hauv qhov yog cua, kev hloov cua convection tsuas yog cuam tshuam rau qhov sib txawv kub thiab qhov loj ntawm cov khoom. Feem ntau hais lus, cov qhov ntawm daim board rwb thaiv tsev pob zeb ua npuas loj dua daim board rwb thaiv tsev ua npuas organic. Tsis nyuaj nrhiav thaum ntxiv qhov sib txawv kub rau daim board rwb thaiv tsev pob zeb ua npuas ncauj. Daim board rwb thaiv tsev ua npuas ntuj uas muaj qhov tuab sib npaug, Qhov sib txawv kub uas ib qhov ntawm daim board rwb thaiv tsev ua npuas thiab daim board rwb thaiv tsev ua npuas ntuj muaj qhov txawv, i, daim board ua npuas loj dua daim board ntuj. Raws li qhov tshwm sim, convective heat transfer ntawm daim board qub siab dua daim thib ob.
(4) Kev hloov pauv cua sov ntawm theem. Hais txog kev hloov theem hloov cua sov hloov, Daim slab pob zeb npuas muaj dej dawb me ntsis, qee yam dej crystal uas yooj yim ploj lossis dej uas nqus tau, uas tej zaum yuav ua rau kev hloov theem hloov cua sov ntawm noo thaum kuaj thiab siv; Daim board rwb thaiv tsev ua npuas organic muaj kev tiv thaiv dej heev, yog li tsis muaj teeb meem hloov theem vim av noo, tab sis cov tshuaj ua npuas thiab tshuaj tiv thaiv hluav taws uas siv hauv kev tsim khoom feem ntau muaj cov khoom volatile uas ua rau kev hloov kub hloov theem. Since the heat of vaporization of water is higher than that of ordinary low-boiling organics, and the volatile components in the organic foam insulation board will become less and less over time, the phase change heat transfer capacity of the foam concrete insulation board must be higher than natural foam insulation board.
From the above analysis, it can be seen that in terms of radiation and conduction heat transfer, there is no significant difference between the foam concrete insulation board and the organic foam insulation board. Tseem, in terms of convection and phase change heat transfer, the former is significantly higher than the latter or Said heat resistance performance is significantly inferior to the latter. In the field of building exterior wall insulation, to truly realize the replacement of organic foam insulation boards by foam concrete insulation boards, it is necessary to research the structure and composition of foam concrete to reduce its thermal conductivity effectively.
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