成果報告書詳細
管理番号20140000000468
タイトル*平成25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」(H23-H27)
公開日2014/8/20
報告書年度2013 - 2013
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混合冷媒の熱力学的性質の測定
・低GWP混合冷媒の伝熱特性の測定
・低GWP混合冷媒のサイクルの基本特性の評価
英文要約(1) Thermophysical properties and heat transfer characteristics of HFO-1234ze(Z)
(a) Thermophysical properties of HFO-1234ze(Z)
The 10 data on the saturated vapor density were obtained, the 19 data on vapor pressure were obtained. The 263 data on PvT property along 11 isochoric curves were obtained. By the visualization of meniscus, the critical parameters were determined. A new equation of state (EOS) was developed for HFO-1234ze(Z), which is valid for temperatures from 273 to 430 K The FLD file for REFPROP based on the equation of state is available from the NIST website.
(b) Transport properties of HFO-1234ze(Z)
The thermal conductivity of superheated HFO-1234ze(Z) vapor was measured by a transient hot-wire method. The viscosities of subcooled liquids of .HFO-1234ze(E) and HFO-1234ze(Z) were measured by the capillary method at the pressures correspond to the saturation temperatures of 99.5, 90, and 70℃.
(c) Heat transfer characteristics of HFO-1234ze(Z)
The evaporation and condensation heat transfer coefficients (HTCs) and pressure gradients of HFO-1234ze(Z) flowing in a horizontal microfin tube with the inner diameter of 5.35 mm were measured.
The condensation and pool boiling HTCs of HFC-134a, HFO-1234ze(E), and HFO-1234ze(Z) on a horizontal plane tube with the outer diameter of 19.12 mm are measured.
(d) Cycle performance of HFO-1234ze(Z)
By drop-in experiments, the cycle performance of HFO-1234ze(E), HFO-1234ze(Z), and HFO-1234ze(E)/HFC-32 (95/5 mass%) were evaluated at higher temperatures.
(2) Thermophysical properties and heat transfer characteristics of low GWP refrigerant mixtures
A ternary blend A (HFO-1234ze(E)/HFC-32/CO2, 53/43/4 mass%) with GWP of 200 and a ternary blend B (HFO-1234ze(E)/HFC-32/CO2, 62/29/9 mass%) with GWP of 300 were selected and their characteristics were investigated as below.
(a) Thermophysical property of low-GWP refrigerant mixture
The thermophysical properties of HFO-1234ze(E)/HFC-32/CO2 (53/43/4 mass%) were measured. By the isochoric method, the 13 data on the saturated vapor density were obtained. The 101 data on PvT property along the 6 isochoric curves were obtained. By the visualization of meniscus, the critical parameters were determined.
A mixture model was presented for the ternary HFO-1234ze(E)/HFC-32/CO2 mixture.
(b) Heat transfer characteristics of low-GWP refrigerant mixtures
HTCs and pressure gradients in a horizontal microfin tube were measured for evaporation and condensation. Heat transfer characteristics in plate heat exchangers was investigated for HFO-1234ze(E). First, the flow pattern of air-water flow was visualized; meanwhile, the void fraction was measured by using a transparent acrylic plate having herringbone-grooves. Next, the heat transfer coefficient of HFO-1234ze(E) in the stainless steel plate heat exchangers having herringbone-grooves was measured.
(c) Cycle performance of low GWP refrigerant mixtures
The cycle performance of the ternary mixture HFO-1234ze(E)/HFC-32/CO2 was evaluated by the drop-in experiment.
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