The difference between thermal insulation and thermal insulation of container hotel building envelope
The thermal insulation performance of the building envelope of a container hotel refers to the ability of the envelope structure to prevent heat transfer from indoor to outdoor under indoor and outdoor conditions in winter, so as to keep the room at an appropriate temperature. The thermal insulation performance of the envelope structure refers to the ability of the envelope structure to maintain an appropriate temperature on its inner surface under the action of the integrated outdoor temperature (combined by outdoor air and solar radiation) and indoor air temperature fluctuations under the condition of natural ventilation in summer. The main differences between the two are: (1) The heat transfer process is different. The thermal insulation performance reflects the heat transfer process from indoor to outdoor in winter, and the thermal insulation performance reflects the heat transfer process from outdoor to indoor and from indoor to outdoor in summer. In winter, the outdoor temperature fluctuates very little throughout the day, and the heat transfer process is dominated by stable heat transfer; the outdoor temperature and solar radiation in summer vary greatly over the course of the day, which is a periodic and unstable heat transfer. (2) Different evaluation indicators. Thermal insulation performance is usually evaluated by heat transfer coefficient K value (unit: W (/m²•K)) or heat transfer resistance RO value (unit: (m²•K)/W). The thermal insulation performance is usually evaluated by the high temperature value of the inner surface of the envelope under the outdoor calculation temperature condition in summer. In the current energy-saving design standards, heat insulation is directly measured by the thermal inertia index (D value) of the envelope structure, and transparent glass can be evaluated by the shading coefficient SC. (3) Different structural measures. Insulation in winter generally only requires the improvement of the thermal resistance of the enclosure structure. Lightweight porous or fibrous materials can be used to meet energy-saving requirements through composite or self-insulation. Heat insulation in summer not only requires greater thermal resistance in the enclosure structure, but also requires better thermal stability (that is, a larger value of D); external windows should also increase the shading coefficient of the glass or set up sun shading to reduce solar radiant heat .
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