Table 5 Measurement variables and instrumentation.
Measured Variable | Instruments | Range | Accuracy |
|---|---|---|---|
Power | |||
MT 1st compressor power | Watt transducer | 0–80,000 W | ±5% of reading |
MT 2nd compressor power | 0–80,000 W | ||
MT 3rd compressor power | 0–80,000 W | ||
LT 1st compressor power | 0–8,000 W | ||
LT 2nd compressor power | 0–8,000 W | ||
Mass Flow Rate | |||
MT evaporator mass flow rate | Coriolis Mass flow meter | ±5% of reading | |
LT evaporator mass flow rate | 0–10 kg/min | ||
Flash tank bypass mass flow rate | |||
Temperature | |||
MT display case suction temperature | Thermocouple | −270- 400 °C | Greater of 1.0 °C or 0.75% for 0 to 350 °C) |
LT display case suction temperature | |||
Flash tank vapor outlet temperature | |||
Gas cooler inlet/outlet temperature | |||
MT compressor rack inlet/outlet temperature | |||
LT compressor rack inlet/outlet temperature | |||
MT 1st compressor suc./dis. temperature | |||
MT 2nd compressor suc./dis. temperature | |||
MT 3rd compressor suc./dis. temperature | |||
LT 1st compressor suc. /dis. temperature | |||
LT 2nd compressor suc./dis. temperature | |||
Pressure | |||
MT display case suction pressure | Pressure transducer | 0–14 Mpa | ±0.25% full scale |
LT display case suction pressure | 0–7 Mpa | ||
Flash tank vapor outlet pressure | 0–14 Mpa | ||
Gas cooler inlet/outlet pressure | 0–14 Mpa | ||
MT compressor rack inlet/outlet pressure | 0–14 Mpa | ||
LT compressor rack inlet pressure | 0–7 Mpa | ||
LT compressor rack outlet pressure | 0–14 Mpa | ||
