Hideyo Nimiya

A Simplified Calculation Method for Seasonal Accumulated Solar Heat Gain through Windows

Abstract To estimate the energy performance of windows, the seasonal accumulated solar heat gain through the windows has to be calculated. A simplified method for calculating seasonal accumulated solar heat gain through windows with arbitrary azimuth and tilt angle is proposed. The method was tested using weather data from seven locations in Japan. The proposed simplified method provided good simulations of detailed hourly calculations.

CALCULATION METHOD FOR THERMAL PERFORMANCE OF THE CURTAIN WALLING WITH FRAMES

This paper examines a method for calculating the thermal performance of curtain walling with frames. A general calculation method was used for obtaining thermal insulation and sun shading performances of curtain walling by referring to ISO and existing investigation. As there have been no fixed calculation methods and the range of modeling frames has not been clearly defined so far, it was not possible to identify thermal performance of curtain walling. Due to this, it has been often the case that the thermal performance of it is calculated assuming that curtain walling is a simple wall consisting of opening units as glazing and spandrel panels as panel materials. As a result of calculating thermal insulation and sun shading performances, the degree of affecting frames, glazing and spandrel panels to them has been made clear. Especially, the necessity for considering the frame in evaluating the thermal insulation performance became clear.

VERIFICATION OF THE EFFECT OF SUNSHADING TECHNIQUES INTRODUCED TO WALLS AND ROOFS THROUGH THE MEASUREMENT AT THE TWO TEST HOUSES

Indoor thermal comfort and energy consumption during summer season are greatly influenced by the radiant heat from windows as well as walls and ceilings. The objective of this report is to compare the surface temperatures of the second floor room of the two test houses, one with sunshading techniques and the other without them, and to verify the proposed calculation method by comparing calculated indoor surface temperatures with measurements. The following results were obtained. (1) The surface temperatures of the test house with sunshading techniques were lower than those of the test house without sunshading techniques during summer, while as the same level as them during winter. (2) The calculated surface temperatures well agreed with the measurements.