成果報告書詳細
管理番号20150000000194
タイトル*平成26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2015/7/18
報告書年度2014 - 2014
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混合冷媒及び新規低GWP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) などの新規低GWP冷媒の基本物性およびサイクル性能に関する研究
・HFO-1243zfの熱力学的性質の測定
・HFO-1234ze(Z),HFO-1243zf,HCFO-1233zd(E)の表面張力の測定
・HFO-1234ze(Z)の輸送的性質の測定
・HFC-134a,HFO-1234ze(E),HFO-1234ze(Z),HCFO-1233zd(E)の管外伝熱特性の評価
(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
・CO2/HFC-32/HFO1234yf 三成分系冷媒の組成の選定
・CO2/HFC-32/HFO1234yf の熱力学的性質の測定
・HFO-1234ze(E)/HFC-32 の伝熱特性の評価
・HFC-32/HFO-1234yfおよびHFC-32/HFO-1234ze(E)二成分系冷媒のサイクル基本特性の評価
英文要約1. Basic properties and cycle performance of newly developed low-GWP refrigerants
(a) Thermophysical properties of HFO-1243zf
The pressure-density-temperature properties, vapor pressures, and saturated liquid and vapor densities for HFO-1243zf were measured with two types of isochoric methods. Then, critical parameters were determined from the present data, and the saturated vapor pressure correlation was proposed. Based on the present data, an equation of state was also formulated.
(b) Surface tension of low GWP refrigerants
The surface tension was measured with the capillary elevation method for HFO-1234ze(Z), HFO-1243zf and HCFO-1233zd(E), and the empirical correlations were proposed.
(c) Transport properties of HFO-1234ze(Z)
The thermal conductivity and viscosity of HFO-1234ze(Z) were measured both in saturated liquid state and superheated vapor state. Then, the extended corresponding models to predict these properties were developed.
(d) Heat transfer characteristics of low GWP refrigerants on a horizontal tube
The condensation and pool boiling heat transfer coefficients (HTCs) of HFC-134a, HFO-1234ze(E), HFO-1234ze(Z) and HCFO-1233zd(E) on a horizontal plane tube were measured. The measured HTCs of these refrigerants except HCFO-1233zd(E) agree well with the Nusselt theory for condensation and the Stephan-Abdelsalam correlation for pool boiling.
2. Basic properties and cycle performance of low-GWP refrigerant mixtures
(a) Search of low-GWP refrigerant mixtures for air-conditioning system
From ternary refrigerant mixture of HFO-1234yf, HFC-32 and CO2, two mixtures were selected: one is mixture “A” with GWP of 298 and the other is mixture “B” with GWP of 197.
(b) Thermophysical properties of ternary mixture of HFO-1234yf/HFC-32/CO2
The saturated vapor densities of two selected ternary mixtures of HFO-1234ze(E)/HFC-32/CO2, “A” and “B”, were measured. The visualization of meniscus also started to determine critical parameters.
(c) Heat transfer characteristics of low-GWP refrigerant mixtures
The condensation and evaporation HTCs of HFO-1234ze(E)/HFC-32 mixture in horizontal micro-fin tubes were measured. Then, it was found that HTCs of HFO-1234ze(E)/HFC-32 mixture were increased with increase of fin number.
The condensation and evaporation HTCs of HFO-1234ze(E) in a herringbone plate heat exchanger was also measured. Then, it was found that the local heat transfer characteristics changed into horizontal and vertical direction drastically.
(d) Cycle performance of low GWP refrigerant mixtures
The cycle performances of several refrigerants were evaluated using a water heat source heat pump loop. Then, it was found that the COP of HFC-32/HFO-1234ze(E) (42/58 mass%) and HFC-32/HFO-1234yf (42/58 mass%) were almost comparable and the COPs of these mixtures exceeded that of R410A.
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