Analysis of Operating Condition of Heat Source Equipment in District Heating and Cooling Plants : Operating Condition of Heat Source Equipment and Estimation of Seasonal Energy Efficiency

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  • 地域冷暖房プラントにおける熱源機器の運転実態に関する分析 : 熱源機運転の実態と期間成績係数の推定方法の検討
  • チイキ レイダンボウ プラント ニ オケル ネツゲン キキ ノ ウンテン ジッタイ ニ カンスル ブンセキ ネツゲンキ ウンテン ノ ジッタイ ト キカン セイセキ ケイスウ ノ スイテイ ホウホウ ノ ケントウ

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In the discussion about energy efficiency of heat source system, conventional studies have paid attention mainly to COP (co-efficient of performance) of refrigerators at rated condition (load factor 100%, cooling water temperature 32 degrees Celsius). However, COP at rated condition is not dominant factor in seasonal energy efficiency because operating time at rated condition is very short. In order to evaluate energy efficiency of heat source equipment appropriately, the operating condition all year around should be analyzed. This paper analyzes two types of district heating and cooling plants, absorption refrigerator and boiler system and electric heat pump system, by use of detailed measurement data with the aim of revealing the operating condition of heat source equipment. The results of analysis show that in well-designed and well-operated plants some refrigerators run only at the peak heat demand period such as daytime in summer, other refrigerators run almost at all season. Briefly, refrigerators have respective roles in producing heat according to refrigerator types and those capacities. It also comes to be obvious that cooling water temperature has strong influence on COP of refrigerators running at the peak heat demand period. In the next place, we estimate seasonal energy efficiencies of each refrigerator in the plants mentioned above by NPLV (non-standard part load value) method, which definition is based on IPLV (integrated part load value). The result shows that there is a difference between NPLV and real seasonal energy efficiency values from measurement data. This means that NPLV calculated in conventional way is not able to estimate seasonal energy efficiency with accuracy because IPLV definition can be applied to only single chiller system, not multiple chiller system and thermal storage system, both of which have already become popular. In addition, we suggest that IPLV/NPLV could be used for evaluating the operation condition of heat source systems.

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