The Required Resistance to Heat Transfer of Translucent Enclosing Structures Based on the Comfortable Conditions Provision

We have justified the required resistance to heat transfer of translucent structures based on ensuring comfortable conditions for a person to stay near such structures during the winter period of operation. We have justified the minimum permissible temperatures of the inner surface of the translucent structure, which provides comfortable conditions. To do this, we investigated the process of heat exchange by radiation between a person and a translucent structure. We carried out numerical simulation of the process of non-stationary heat exchange through the construction of insulating glass units in conditions of a sharp decrease in outdoor temperature. This allowed us to determine the delay time of the temperature change on the inner surface of the insulating glass units following the change in the temperature of the outside air. Thanks to this, we have justified the calculated outdoor air temperature to determine the required heat transfer resistance of translucent structures based on providing comfortable conditions. The required resistance to heat transfer of a translucent structure when calculating from comfortable conditions should be such as to ensure that the temperature on its inner surface is not lower than on an opaque enclosing structure. This condition is still technologically impossible for translucent structures currently used in standard construction. However, the minimum values of heat transfer resistance corresponding to the intensity of heat exchange, at which a person feels comfortable near translucent structures (q = 93 W/m²), can be achieved in practice today. For the conditions of the Russian Federation, this value is now on average only 1.4 times higher than the standard values. It is established that the permissible temperature on the inner surface of the translucent structure is comparable to the standard dew point temperature. In view of this, it seems expedient in cases where a detailed calculation of the conditions of heat exchange between a person and translucent structures is not performed, to assign the required resistance of translucent structures based on the inadmissibility of condensation on their inner surface at standard values of temperature and relative humidity of the internal air. At the same time, due to the low thermal inertia of translucent structures, an absolutely minimum temperature should be used as the calculated outdoor air temperature.

авторы

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