## 3 Results
### Daytime Thermal Environments
#### 3.2.4 Indoor Thermal Environment  
The attached sunspace transmits heat into the room in two ways after the active interior window is opened: heat is transmitted into the room through the active interior window via convection heat exchange at first; afterwards, the outer surface of the public wall absorbs solar radiation, transmits it to the inner surface via heat conduction, and then transmits it to the indoor air via convection. The active interior window was opened at 10:40 and closed at 17:00 on 28 January. Distribution of indoor temperature variation with time of measuring points is depicted in Figure 13.  
As shown in Figure 13a, in order to examine the indoor thermal environment tangential distribution on the daytime of 28 January, the longitudinal section in the north-south direction at the center of the room 2 was investigated, which is the longitudinal section where the previously established temperature measurement stations are located. As described in Figure 13b-k, when the active interior window was not opened from 9:00 to 10:00, the temperature in the south of the room was slightly higher than that in the north due to the influence of solar radiation and heat transfer through the public wall, but the indoor temperature remained cold at less than 14 \({}^{\circ}\)C. When the interior active window was opened from 11:00 to 15:00, the indoor ambient temperature rose rapidly, and distribution started  
Figure 12: Cross distribution map of morning the sunspace’s thermal environment on 28 January; (**a**) Attached sunspace’s cross section of temperature field; (**b**) Distribution of temperature field at 8:30; (**c**) Distribution of temperature field at 9:00; (**d**) Distribution of temperature field at 9:30; (**e**) Distribution of temperature field at 10:00; (**f**) Distribution of temperature field at 10:30.  
to be uneven. Overall, the indoor thermal environment in the south was greater than that in the north and a higher temperature in the upper layer than in the lower. However, the temperature of the lower space in the south of the room, is the most prominently affected by the ASPSHS. The temperature hits 30.93 \({}^{\circ}\)C at 14:00, the maximum indoor temperature of the day. But while the temperature at this place began to drop, the temperature in other locations impacted by thermal convection continued to rise. The indoor temperature dropped from 15:00 to 17:00, and the interior active window was closed to minimize the loss of heat. In order to evaluate whether the distribution of the indoor thermal environment was uniform, the difference between the maximum and minimum values of the temperature at each measurement point at each moment was calculated, the maximum temperature difference is shown in Table 3.  
Figure 13: _Cont_. Figure 13: Tangential distribution map of indoor daytime temperature gradient on 28 January; (**a**) Indoor tangential section of temperature field; (**b**) Distribution of temperature field at 9:00; (**c**) Distribution of temperature field at 10:00; (**d**) Distribution of temperature field at 11:00; (**e**) Distribution of temperature field at 12:00; (**f**) Distribution of temperature field at 13:00. (**g**) Distribution of temperature field at 14:00; (**h**) Distribution of temperature field at 15:00. (**i**) Distribution of temperature field at 16:00; (**j**) Distribution of temperature field at 17:00; (**k**) Distribution of a temperature field at 18:00. During the period (11:00-17:00) when the interior active window was opened, the average value of the greatest temperature differential at each measuring point at each time was 4.95 \({}^{\circ}\)C. From 11:00 to 14:00, the temperature differential of the lower layer in the south and north was the greatest value at each measuring location. From 15:00 to 17:00, the temperature differential of the lowest layer in the south and the highest layer in the north is the greatest value at each measuring location.