## 4 Conclusions and Prospects  
### Conclusions  
The purpose of this research was to investigate the cooling and ventilation of traditional houses in summer and their heating in winter. In summer, the cold alleys in settlements are used in natural conditions. The cold air in the cold alley is introduced into the room for ventilation and cooling based on hot pressure ventilation the accumulation effect from the courtyard. Air ducts are used to connect the rooms on both sides of the courtyard, greatly improving the cooling efficiency. The cold air trapped in the new system can form an air partition wall, effectively blocking the direct influence of solar radiation on the room, reducing the heat transfer rate of the building wall and consuming part of the heat. After using the new system, the ventilation efficiency of the entire building was greatly improved; this made the air flow in the building more active and facilitated ventilation. In winter, when the air ducts are used as supporting members, a glass roof can be added to the patio. This improved the heat storage capacity of the patio and turned it into a constant-temperature heater for heating the building interior. The cooling load of the air insulation wall, the cooling load and cooling efficiency of the ventilation and cooling from the cold alley, the heating load and heating efficiency of the courtyard heat storage in winter, and the overall cooling and heating efficiencies were calculated. Detailed statistics were calculated regarding the available time for the new system throughout the year, along with the increase in the thermal comfort time of the building in each room after using the new system. The specific conclusions are as follows:  
* After the building used the new system, the total cooling load, as reduced by the air insulation wall throughout the year, was 1133.7 kWh. After cooling through the cold alley without WHR, the cooling efficiency of the new system was 3.61 \({}^{\circ}\)C/h, and the total cooling load in the building in one year was reduced by 55,417.33 kWh. With  
Figure 22: Thermal comfort time comparison.  
WHR, the cooling efficiency of the new system was 1.03 \({}^{\circ}\)C/h, and the total cooling load was reduced by 28,537.57 kWh. This shows that the WHR has a negligible effect on the indoor temperature.
* Adding a glass roof above the pati can increase its heat storage capacity. The pati completed heat storage after 33.3 min, and then began heating the indoor areas. After using the glass roof for a year, the total heating load of the courtyard for the building was 54,537.78 kWh.
* After the building used the new system without WHR, the time it took for the room to reach the thermal equilibrium temperature was 1.66 h, and the thermal equilibrium temperature was 28 \({}^{\circ}\)C. With WHR, the time for the room to reach the thermal equilibrium temperature was 1.94 h, and the temperature was 32 \({}^{\circ}\)C. The ventilation time was shortened from the original 2.22 h to 4 min; this also shows that the indoor heat transfer rate of the room has nothing to do with the ventilation rate.
* The temperature range for thermal comfort in Shuhe is 18-25 \({}^{\circ}\)C. The total time in the base case meeting the thermal comfort temperature over a year was 2349 h, accounting for 26.81% of the total time of the year. After using the new system without WHR, the annual time meeting the thermal comfort temperature was 2455 h, accounting for 28.02% of the annual time, and an increase of 106 h relative to the base case. With WHR, the annual time meeting the thermal comfort temperature in a year was 2420 h, accounting for 27.62% of the year, an increase of 71 h relative to the base case. The location of the room affects the temperature in the room, and the thermal comfort time of all rooms decreases after considering the WHR.