成果報告書詳細
管理番号20130000000174
タイトル*平成24年度中間年報 省エネルギー革新技術開発事業 先導研究(事前研究一体型) 二酸化炭素冷媒で作動する圧縮吸収ハイブリッドサイクルの研究開発
公開日2013/5/2
報告書年度2012 - 2012
委託先名パナソニック株式会社 独立行政法人産業技術総合研究所
プロジェクト番号P09015
部署名省エネルギー部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
1 空調用圧縮/吸収サイクル技術に最適なCO2 吸収液の研究(産業技術総合研究所)
ア)イオン液体の選定および開発
ハイブリッドサイクル用の吸収液として、1-ethyl-3-methylimidazolium acetate ([emim][ace],図1-(a)参照)と1-ethyl-3-methylimidazolium tetracyanoborate ([emim][TCB], 図1-(b)参照)を新たに選定・開発した。
英文要約Summary of Research and Development in Fiscal Year of H24
1) Studies on CO2 absorbents for compression/absorption cycle technology in air-conditioner
a) Development of ionic liquids
The 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([BMIM][Tf2N]) has been selected as a typical model absorbent because of its high CO2 solubility, relatively low viscosity, and wide liquid temperature range.
b) Measurements and estimation of thermophysical properties of ionic liquids
The solubilities of CO2 in [BMIM][Tf2N] have been determined at 5, 25, 40, 60, and 80 oC. The volume concentration (CCO2) of CO2 increased almost linearly with increasing pressure at each temperature. The pressure dependencies of CCO2 were well represented by cubic equations, which can provide a good estimation of CCO2 over a wide range of temperature and pressure.
The enthalpies of [BMIM][Tf2N]-CO2 system have been evaluated by summing the enthalpies of pure components, [BMIM][Tf2N] and CO2, without pressure correction for [BMIM][Tf2N].
The viscosities of [BMIM][Tf2N]-CO2 have also been estimated from the good relation with the electrical conductivities. The viscosity decreased with increasing CO2 pressure, more remarkably at lower temperature.
c) Cycle simulations
Using a steady-state chemical process simulator, VMGSim, thermophysical properties, densities and viscosities, in pure [BMIM][Tf2N] and [BMIM][Tf2N]-CO2 mixture have been calculated at 3 and 9 MPa at 35-85 oC. The viscosities calculated decreased remarkably when CO2 was dissolved, which was in a good agreement with the experimental results.
2) Research on the compression-absorption hybrid cycle
For design for power recovery unit integrated solution pump, we constructed prototypes of an improved pump that operates even at an intake side shaft end seal performance of 4 MPa based on a vane pump with a rated discharge volume of 7.5 L/min @1,000 rpm and of a power recovery unit.
We evaluated the power recovery rate from the power generation amount of the monitor connected to the same shaft as the power recovery unit by operating the power recovery unit when the pump head is 3.4 MPa as estimated under the hybrid cycle rated operation conditions.
For design for regenerator and absorber, we prepared the basic design for a water-cooled absorption heat exchanger based on the [BMIM][Tf2N] measured under the rated pressure 4 MPa conditions assumed for the absorber. And we built an individual tube heat-transfer performance measurement unit for absorber and regenerator heat-transfer tubes.
3) Prototype and performance evaluation
For prototype and performance evaluation, we created a prototype absorption cycle by combining a vane pump, for which the standalone performance had been measured, with a power recovery unit.
The hybrid cycle was operated after setting the evaporator cooling water temperature at 7 ºC and the gas cooler and absorber cooling water temperature at 35 ºC as the cooling rating conditions. The exhaust heat supply temperature was 75 ºC at the inlet and 65 ºC at the outlet.
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