Research On The Thermal Performance Optimization Design Of Rural Residence Raised Ventilated Ground In Chongqing

The annual high humidity in the Chongqing area has caused damp problems in the interior of the residential building.The ground is prone to dampness and condensation,affecting indoor living quality and residents' health.The basic way to control ground condensation is to increase the temperature of the ground.Overhead floors are commonly used in urban dwellings to solve the problem of indoor ground moisture.However,rural houses have not taken effective measures to control indoor humidity.This paper studies the thermal performance of rural residences using overhead ground moisture,and combines the characteristics of rural residential ground temperature to optimize the design of overhead ground.Provide reference for architects to conduct moisture-proof design and practical engineering application.First of all,the investigation and analysis of the moisture-proof status of some buildings in urban areas and rural areas in Chongqing shows that the construction of the urban areas generally adopts measures such as overhead protection and ground insulation,but no effective ground-based moisture prevention measures have been implemented in rural areas.Moisture is more common.The ground heat and moisture status of four typical rural brick-concrete dwellings in the countryside were measured and measured.The ground temperature was low from May to June,and there was dew condensation.By July,the high temperature weather began,the ground no longer condenses,and the ground temperature at the same time.Below the indoor temperature,the ground has a cooling effect on the interior.Therefore,the use of ground moisture prevention measures should take into account the use of ground temperature in other seasons.Based on the actual measurement,using Design-Builder software to simulate indoor hot and humid conditions of a typical house throughout the spring and summer season,as well as the effect of improving the insulation floor and aerial ventilation ground,adopt the equivalent moisture-proof method to obtain different structural parameters.The aerial thermal resistance of aerial ventilation.And determine the minimum thermal resistance of the aerial ventilation floor to meet the moisture-proof requirement is 0.48m2·K/W.Then further study the impact of overhead ground on the indoor thermal environment.The controllable ventilation overhead ground optimization method is proposed,ie,the ventilation opening and closing modes are adopted for different seasons,and the ventilation openings are mainly damp-proof during the wet season in spring and summer,and the ventilation openings are closed in summer and winter when the ground is not humid,and the ground temperature is mainly used..The simulation results show that under the conditions of no heating and air conditioning,the ground temperature in summer is lowered by 0.7°C in summer,and the surface temperature in winter is increased by 0.9°C.Under the condition of heating and air conditioning,the air conditioning cooling and heating energy consumption are reduced by 20% and 23%,respectively.At the same time,the experimental method was used to verify the effect of cooling in summer,indicating that it is more reasonable to use controlled ventilated overhead ground in rural houses.Finally,design proposals and requirements for the vent shields of controllable ventilated raised floors are proposed.