Heat transfer coefficient of hotel doors and windows

Heat transfer coefficient K=2.8 per 55 series per 14.8mm per 3.25+ 12A+5 per 2.63.

The k value of heat transfer coefficient refers to the heat transferred within 1 hour in the area of 1 square meter when the air temperature difference between the two sides of the envelope is 1 degree (k,℃) under the condition of stable heat transfer, and the unit is watt/square meter _ degree (W/__K).