Author(s): Masataka Shirakashi; Akio Uchikura; Teruyoshi Umemura; Akira Okada; Hiroshi Taniuchi; Norio Hayakawa
Linked Author(s): Norio Hayakawa
Keywords: No Keywords
Abstract: In order to provide Nagaoka city, of which climate is characterized by heavy snowfall in winter and high temperature and humidity in summer. with facilities for snow removal and air conditioning, a system was proposed and energy and economic assessment was carried out. The area to be served is an urban area of 16 km2 i nhabited by 28.000 families. The system is designed to have a capacity to keep 10 to 36 % of the area snow free throughout winter and to supply sufficient negative heat to every family in this area for air conditioning through summer. The total annual electricity consumption of this system is estimated to correspond to 60 % of electricity now consumed in summer for air conditioning in the area. Since hydraulic conveying of snow is a key technique to be developed for a practical application of this system. devices for snow/water mixture were developed and the flow characteristics of snow/water mixture were investigated experimentally. Flow patterns in pipes are classified with respect to snow concentration and the Froude number, and pressure drop data in straight pipes and pipe conjunctions are correlated with relevant non-dimensional parameters to give prediction formulas for pressure and energy losses.
Year: 1989