Generalized Performance Characteristics of Refrigeration and Heat Pump Systems

<table>Dimensionless cooling rate (<svg height="10.35" id="M124" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 11.5875 10.35" width="11.5875" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,10.35)">
<g transform="translate(72,-63.72)">
<text transform="matrix(1,0,0,-1,-71.95,63.77)">
<tspan style="font-size: 11.21px; " x="0" y="0">𝑟</tspan>
</text>
<text transform="matrix(1,0,0,-1,-67.38,68.25)">
<tspan style="font-size: 7.85px; " x="0" y="0">∗</tspan>
</text>
</g>
</g>
</svg>) versus coefficient of performance (<svg height="6.6999998" id="M125" style="vertical-align:-0.10126pt" version="1.1" viewbox="0 0 10.9875 6.6999998" width="10.9875" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,6.7)">
<g transform="translate(72,-66.64)">
<text transform="matrix(1,0,0,-1,-71.95,66.79)">
<tspan style="font-size: 11.21px; " x="0" y="0">𝑤</tspan>
</text>
</g>
</g>
</svg>) for the reverse Brayton cycle. Plots are presented for different values of the isentropic efficiency <svg height="9.8874998" id="M126" style="vertical-align:-2.88338pt" version="1.1" viewbox="0 0 10.825 9.8874998" width="10.825" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,9.8875)">
<g transform="translate(72,-64.09)">
<text transform="matrix(1,0,0,-1,-71.95,67.01)">
<tspan style="font-size: 11.21px; " x="0" y="0">𝜂</tspan>
</text>
<text transform="matrix(1,0,0,-1,-66.35,64.21)">
<tspan style="font-size: 7.85px; " x="0" y="0">𝑡</tspan>
</text>
</g>
</g>
</svg> in the range 0.8–1.0, where <svg height="13.1875" id="M127" style="vertical-align:-2.88338pt" version="1.1" viewbox="0 0 35.212502 13.1875" width="35.212502" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,13.1875)">
<g transform="translate(72,-61.45)">
<text transform="matrix(1,0,0,-1,-71.95,64.37)">
<tspan style="font-size: 11.21px; " x="0" y="0">𝜂</tspan>
</text>
<text transform="matrix(1,0,0,-1,-66.35,61.57)">
<tspan style="font-size: 7.85px; " x="0" y="0">𝑡</tspan>
</text>
<text transform="matrix(1,0,0,-1,-60.28,64.37)">
<tspan style="font-size: 11.21px; " x="0" y="0">=</tspan>
<tspan style="font-size: 11.21px; " x="10.782096" y="0">1</tspan>
</text>
</g>
</g>
</svg> corresponds to reversible operation.</table>

Physics Research International

fig5

Figure 5

Figure 5: Generalized Performance Characteristics of Refrigeration and Heat Pump Systems 