Modulation Techniques for Compressors â Part II
Modulation Techniques for Compressors â Part II
Modulation Techniques for Compressors â Part II
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Per<strong>for</strong>mance Behaviour of CSH Screw<br />
– Slider Unloading vs. VSD –<br />
110<br />
SST / SDT Varying vs. Load – LWT 6.7°C (44°F) / EDB 35°C (95°F)<br />
100<br />
90<br />
80<br />
R407C<br />
Power Input [%]<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
0 10 20 30 40 50 60 70 80 90 100<br />
Cooling Capacity [%]<br />
proportional -<br />
fixed conditions<br />
Slider -- SST / SDT<br />
varying vs. Load<br />
VSD -- SST / SDT<br />
varying vs. Load<br />
100% Load:<br />
SST 2°C (35°F)<br />
SDT 52°C (125°F)<br />
- based on dew points<br />
Mod<strong>Techniques</strong> <strong>II</strong>_ASHRAE01.2003 – 14
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