With the lacking of electricity and coal, people have to face the scarce of energy. more and more problems about the air pollution, the environment and such series of aspects appearing, which make people to realize the importance of the ecological environment. Through theenergy conservation analysis about the rural houses in north areas and the application of some typical energy conservation methods, this article shows the necessity of energy conservation of rural houses in north areas and the future trend of development.

This study is to develop the new type of environmentally friendly Ondol system for improvement of energy efficiency, improvement of impact sound insulation of floors and reduction of material & resources in apartment houses. The prototypes for development of the Environmentally Friendly Ondol System of Double layer (E02 System) are designed and are made as the manufactures in order to improve energy efficiency & the impact sound insulation of floors and reduce material & resources in apartment houses. The performance measurement of impact sound insulation of floors is tested. and the performance on the E02 System is compared with the existing Ondol system. As a result, the impact sound insulation of floors of the E02 System is improved more 15 dB than standard level. The E02 System got the first grade Certificate on the impact sound insulation of floors. The performance of thermal insulation and energy efficiency is compared the E02 System with the existing Ondol system. The E02 System is evaluated as more 9% of energy efficiency than the existing Ondol system. The component weight per area of the E02 system is 96 kglm', and it is evaluated as reduction of the existing structure weight. Therefore the E02 system will be utilized as solution for pending problems in apartment houses in Korea.

Correct air diffusion is essential for good air quality, comfortable conditions and energy efficiency in mechanical ventilation system. One general method to improve indoor air quality is to simply increase the ventilation rate. This approach, however, often conflicts with building energy efficiency requirement because conditioning outdoor air to the proper temperature, humidity level count for use as ventilation air consumes energy. Therefore, it is necessary for designers to predict the air movement properly. Successful predictions of room airflow yield such information as velocities and temperature distributions, which are useful to building design and analysis. In this paper, the application of computational fluid dynamic (CFD) techniques to large space design and analysis was investigated by comparing the results of CFD simulations and experimental results.

To design an efficient and acceptable indoor air environment in a badminton gymnasium, it is important to study the velocity and temperature field in the conditioned room. For diverse airflow patterns, the k- c models with wall function near solid boundaries are adopted to simulate airflow distribution in the gymnasium. The simulated result is analyzed in this paper, and it provides the important reference for the design of air condition system and optimization of the project. CFD is effective design tool for air flow in large space, for it can give the velocity and temperature values at any point quantitatively.

This study is for analyzing a house and underfloor heating systems called gudle of Korean Chinese, Manchurian and Chinese that are located in the northeast China, which is north of Korean peninsula. Thus it has the similarity and difference among the form of gudle of each folks. The basic form of gudle in Manchurian area of China differs and falls into four categories: U-shaped kang, L-shaped kang, /-shaped kang and whole gudle(gudle that is composed of the whole place). In case of U-shaped kang, it is a basic form of Manchurian and designed for protecting cold weather in northeast area. U-shaped kang has a long space that can be heated so that it enables as many as family members to sleep. It has the advantage of making the best use of space. The form of Chinese is /-shaped kang. As Chinese has traditionally lifestyle of chair sitting culture, so it has the form of tonggudle, or a room equipped with gudle unlike yoegudle that a fire was made under a stone like goindoel and is suitable for lifestyle of chair sitting culture. As for the kang of Korean Chinese, it is called gudle and has the largest in width compared with that of Manchurian and Chinese. Also, the height of gudle is much lower than other houses by about 30~40cm because Korean Chinese have been living "floor sitting culture"on gudle, which means the tradition of removing one's shoes before entering and sitting on the floor, while other folks like Manchurian has lifestyle of "chair sitting culture". Therefore the study found out that the folk housing of each tribe in the northeast China has similarity and difference at the same time. In particular, the form and size of gudle(kang) varies depending on the way of life.