Passive low-energy building winter warm summer cool principle

The most important features of passive low-energy building houses are high thermal insulation performance and high airtightness. The heat provided by indoor and outdoor heat sources in winter can be kept more indoors, and the heat generated by indoor residents and electric appliances such as electric lights and refrigerators. , enough to make up for or even more than the heat lost through the heat transfer of the building envelope every day.

At the same time, through the new air heat recovery system, there is enough fresh air ventilation performance under high air tightness conditions. According to the residents who tried to live in the building for a winter, the building is not only comfortable in temperature, but also fresh in air. What is even more surprising is its super cleanliness. In recent years, the haze weather in winter in North China has become more and more serious. In general, the house is cleaned with a rag every day and rubbed with a mop. Otherwise, a layer of dust will fall. The passive house, even if it is rubbed once a week, does not feel dust. This is the bigger highlight of the passive house for office workers who don't have time to clean the room every day.

The ultra-clean performance of passive houses depends mainly on the high air tightness of the house, while benefiting from the good fresh air filtration device of the building's new fan heat recovery system, which can filter most of the inhalable particles in the air. The expert in charge of the test design of the residential fresh air heat recovery system is also preparing to replace the fresh air filter unit in the building heat recovery unit with the PM2.5 particle type. At that time, the ultra-cleanness of the passive building test house will be further improved. One step.

The passive low-energy building has an outer wall insulation of 270mm thick and airtight. The winter is much warmer than traditional buildings. Will it be hotter than traditional buildings in the summer? In fact, for residential buildings It is said that the heat source that has the greatest impact on the indoor environment in summer is solar radiation, not indoor human body and electrical appliances. The thermal impact of solar radiation on the indoor environment of the house is much greater than the thermal influence of the indoor heat source.

In the hot summer months, the passive building can rely on its high heat insulation and high air tightness enclosure to minimize the thermal impact of summer hot weather conditions such as solar radiation on the indoor environment (similar to the insulation in the refrigerator). The same layer), in order to give full play to the good cold storage and heat absorption performance of the indoor reinforced concrete retaining structure, before the indoor and outdoor heat source has not yet heated the indoor reinforced concrete structural material, the new wind provided by the new wind heat recovery system, the indoor steel The heat accumulated in the mixed structure wall is discharged to the outside in time, so that the heat impact of the indoor and outdoor heat sources on the indoor environment in summer can be reduced as low as possible. In this way, in the summer sauna days, even if the air conditioner is not turned on, the interior will be cool and comfortable, so that the air conditioner can be used or used as little as possible.