成果報告書詳細
管理番号20130000000373
タイトル*平成24年度中間年報 高効率ノンフロン型空調機器技術の開発 冷媒の性能、安全性評価 業務用空調機器に適した低GWP冷媒の探求とその安全性、物性および性能評価
公開日2013/7/27
報告書年度2012 - 2012
委託先名国立大学法人九州大学
プロジェクト番号P11008
部署名環境部
和文要約低GWP混合冷媒を実用冷媒として使用するための基盤技術を構築するために、下記研究項目を実施した。
(1)HFO-1234ze(Z)の基本物性及びサイクル性能に関する研究
・HFO-1234ze(Z)の化学的性質の調査
・HFO-1234ze(Z)の熱力学的性質の測定
・HFO-1234ze(Z)の輸送的性質の測定
・HFO-1234ze(Z)の伝熱特性の測定
・HFO-1234ze(Z)のサイクルの基本特性の評価
(2)低GWP混合冷媒の探求とその基本物性及びサイクル性能に関する研究
・低GWP混合冷媒の探求・選定
・低GWP混合冷媒の熱力学的性質の測定
・低GWP混合冷媒の輸送的性質の測定
・低GWP混合冷媒の伝熱特性の測定
・低GWP混合冷媒候補のサイクルの基本特性の評価
英文要約(1) Research on the basic property and cycle performance of HFO-1234ze(Z)
(a) Chemical characteristics of HFO-1234ze(Z)
For air/HFO-1234ze(Z), the flammability range was confirmed to be from 7.5 to 16.4vol%. With ignition energy of 800mJ, there was no ignition point for air/HFO-1234ze(Z)(8.0 to 16.0vol%).
To evaluate the toxicity, the bacterial reverse mutation test and the acute inhalation toxicity check in rats were carried out. HFO-1234ze(Z) has no mutagenic activity against bacteria. LC50(4h) was larger than 21695ppm, which means the acute inhalation toxicity is negative.
(b) Thermodynamic properties of HFO-1234ze(Z)
PvT properties were measured at temperatures from 310 to 440K. The saturation density was obtained by the properties and the observation of meniscus (45 to 1002kgm-3). The critical parameters were carefully determined as, Tcrit=423.27±0.03K, -crit=470±5kgm-3, and Pcrit=3533±10kPa. From these and available data, an equation of state formulated with Helmholtz energy was proposed.
(c) Transport properties of HFO-1234ze(Z)
By a transient hot-wire method, the thermal conductivity of the saturated liquid was measured (10 to 70 oC). Also, the viscosity was measured by a capillary viscometer (10 to 60 oC).
(d) Heat transfer characteristics of HFO-1234ze(Z)
Heat transfer of HFO-1234ze(Z) flow in a horizontal microfin tube of 5.34 mm ID was experimentally investigated.
(e) Cycle performance of HFO-1234ze(Z)
A drop-in experiment was carried out. The results suggested that HFO-1234ze(Z) cycle can achieve higher performance at the condensation temperatures above 100oC.

(2) Pursuit of low GWP refrigerant mixture and research on its basic properties and cycle performance
(a) Pursuit and selection of low GWP refrigerant mixture
The thermodynamic analysis was accomplished for HFO-1234ze(E)/HFC-32/CO2. Based upon the criteria of GWP, temperature glide, volumetric capacity, and COP, two compositions were selected as, “A”:(53/43/4mass%) of GWP-300 and “B”:(62/29/9mass%) of GWP-200.
(b) Thermodynamic properties of the mixture
For the ternary blends “A” and “B”, PvTx properties and the critical parameters were obtained. From available data, the mixing model was optimized for HFO-1234ze(E)/HFC-32/CO2.
(c) Transport properties of the mixture
The thermal conductivity of saturated liquid was measured for HFO-1234ze(E)/HFC-32 (50/50mass%) and HFO-1234ze(Z)/HFC-32(50/50mass%). The measured conductivity was lower than the interpolated value from the components.
(d) Heat transfer characteristics of the mixture
Heat transfer and pressure drop of HFO-1234ze(E)/HFC-32 inside the microfin tubes and the multi-port tubes were investigated. The binary blend yields the lower heat transfer coefficient than the components. This identifies the mass transfer resistance by the volatility difference.
(e) Cycle performance of the mixture
The equilibrium of HFO-1234ze(E)/HFC-32/CO2 was measured preliminary to the drop-in experiments.
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