Feasibility Study on the Single Pipe District Heating System for a Housing Complex

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In this paper the possibilities of applying a single pipe district heating system to a housing complex in Japan were examined from the view point of the heat (space heating) and mass (hot water volume) balance of the system. As well known, the single pipe district heating (SPDH) system had been adapted mainly in USSR or East European countries to distribute fatal space heating source and hot water to existing cities and/or new towns from romote nuclear or conventional thermal power KOMBINAT. The SPDH system is one of the most economic systems to deliver exhaust heat from remote co-generation plants, municipal incineration plants or various industrial process plants, to the big heat and hot water consuming customers. In the SPDH system, the high temperature hot water is first used for heat source of space heating and them consumed and drained as domestic hot water of apartment houses or building etc.. So, it is desirable that the daily neccessary domestic hot water supply volume dominates the volume, required for space heating heat load even in cold winter days. The SPDH system is becoming more attractive to improve the total energy supply efficiency of the nation and also rore effective at a warmer district like the mainland of Japan, in which thermal insulation standards are improving rapidly and the domestic water supply volume is iscreasing inevitably, where the maximum high-temperature hot water supply temperature from district lines could be kept minimum even in the cold days of winter season. Low supply terperature is desirable to avoid lowering the power output and efficiency of the thermal power plant and for decreasing heat loss of distribution lines and for enlarging the possibilities of selecting low price piping materials and piping systems. In the present paper, the authors designed a unique, low cost central space heating and HWS system for apartment houses and applied this system to a housing complex in Tokyo for computer simulation. As the result of the simulation, the following points were clarified : (1) The seasonal space heating load for a south-facing flat of the typical, the first and the top story is 6.3,10.6 and 10.2 GJ, respectively and increment of load for the east facing flat from that is less thas 3% for the southfacing flat. (2) The maximum heating capacity of an unique all-fresh air (ventilation) central heating system is only 1.884 kW for each flat and yet as much as about 97,95 and 91% of the total seasonal load of the flat of the typical, the first and the top story, respecitively can be covered. (3) The excess heat load could be supplied by (a) operating heat pump air conitioner for each flat as a booster only in the early morning of coldest winter days, keeping the share of the HPAC within about 3% and by (b) allowing over-flow of hot water volume by 2% beyond the necessary hot water supply volume to be used in flush water system. (4) For apartment houses located in moderates climate areas of Tokyo, Japan, usually furnished with one or more air source heat pump air conditioners, a maximum temperature of about 120℃ is acceptable when using the hot water supply of the SPDH system with peak-shaving heat pump air conditioner.
東海大学の論文

Feasibility Study on the Single Pipe District Heating System for a Housing Complex

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