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R507A Flow Meter: Sizing for Large-Scale Industrial Flooded Evaporators
Quick Answer
A Coriolis mass flow meter is the most reliable choice for liquid R507A lines feeding flooded evaporators. It ignores density shifts from subcooling or oil and measures mass flow directly. For most large installations with pipe sizes DN65 to DN100, a single meter covers flow ranges from 3,000 kg/h up to 30,000 kg/h. Send your operating pressure, temperature, pipe size, and flow range to Silver Instruments for a specific model suggestion.
Why a Coriolis Meter Works Here
R507A is a near-azeotropic HFC blend used in low-temperature industrial refrigeration. In a flooded evaporator, the shell side stays full of liquid refrigerant, and a small amount of oil circulates with the flow. A Coriolis sensor measures mass flow and density with no need for long straight pipe runs or laminar flow. These properties matter because R507A has low viscosity, which can cause poor signal stability in vortex or turbine meters.
Volume-based meters also struggle when a tiny fraction of flash gas appears after the expansion valve. Even 1 percent vapour by volume can destroy their accuracy. Coriolis meters manage entrained gas within limits and often include diagnostic alerts for two-phase conditions. For flooded evaporator circuits that use a modulating valve to control liquid level, the repeatable mass flow signal helps the PLC maintain steady superheat without extra compensation.
Sizing Parameters You Must Define
Begin with the minimum and maximum mass flow the evaporator circuit needs. Convert the evaporator capacity into refrigerant flow using the enthalpy difference. A 500 kW flooded evaporator running R507A at a -25°C saturation temperature with a 130 kJ/kg enthalpy change requires about 3.85 kg/s, or 13,860 kg/h. Add a 15 to 20 percent safety margin to cover pulldown loads and part-load surges.
Next, confirm the operating pressure. R507A flooded evaporators typically run at a gauge pressure of 2 to 5 bar, but the flow meter must withstand the system maximum working pressure, often 25 bar or PN25. Temperature rating is just as critical. The sensor body must handle -40°C without embrittlement. Standard 316L stainless steel works well, and the electronics can be remote-mounted away from the cold line.
Pipe size ties directly to the flow range. A DN65 line can pass roughly 8,000 to 15,000 kg/h of liquid R507A with an acceptable pressure drop. The main liquid supply to large evaporators is often DN80 or DN100. Silver Instruments supplies Coriolis meters with process connections from DN3 up to DN200, so we always find a direct match without reducers.
Pipe Sizes and Flow Ranges in Practice
We have sized meters for cold storage and food processing plants in Vietnam, Indonesia, and Chile. Last year a facility in Surabaya needed a meter on a DN80 liquid line feeding a shell-and-tube flooded evaporator at -30°C and 2.9 bar. Peak flow was 9,500 kg/h. We supplied a Silver Instruments Coriolis meter with a DN50 connection and a reduced face-to-face length to fit the existing pipe rack. The meter sent mass flow, density, and temperature over a 4-20 mA HART signal straight to the PLC.
In practice, a meter with a nominal capacity of 15,000 kg/h matches DN80 applications. For DN100 lines, a 25,000 to 30,000 kg/h meter is common. Always check the pressure drop across the meter at maximum flow. A
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Installation Tips for Large Lines
Mount the sensor in the main liquid line after the receiver vessel and before the expansion valve. Do not place the meter directly downstream of a modulating level control valve because the pressure drop can cause flashing. If the pipe vibrates, use rigid supports before and after the meter. Coriolis meters do not require long straight runs, but aligning the flanges with the pipe axes prevents stress on the sensor body.
For outdoor installations in hot climates such as the Middle East, shade the transmitter housing to keep the ambient temperature below 55°C. The sensor itself can sit in direct sun, but the electronics need protection. Silver Instruments meters are built with IP66 or IP67 enclosures. ATEX Zone 1 or Zone 2 certification is available for plants that handle flammable refrigerants or require electrical classification on ammonia systems.
Silver Instruments Meter Models for R507A
Silver Automation Instruments recommends the SI-CMF series Coriolis mass flow meters for R507A flooded evaporator service. The usual configuration includes 316L wetted parts, a secondary containment shell, and direct density output. Transmitter choices include integral or remote mount, 4-20 mA HART, RS485 Modbus, and pulse. Liquid accuracy is rated at ±0.1% of rate over a wide turndown.
A common part number for refrigeration is SI-CMF-080, sensor code S316, paired with a remote ATEX Zone 1 transmitter. This single meter outputs mass flow, density, and temperature. No extra temperature sensor or flow computer is needed. Compared to an orifice plate with a differential pressure transmitter, the installed cost is lower because you avoid impulse lines and a separate multivariable device.
FAQ
Q: Can a Coriolis meter handle R507A with oil carryover?
A: Yes. The oil stays dissolved or finely dispersed and does not corrupt the mass flow reading. The meter can also flag a density shift if heavy oil accumulation occurs, giving the operator an early warning.
Q: What turndown ratio is available?
A: The SI-CMF series delivers a turndown of 20:1 to 30:1 without losing rated accuracy. This covers low-load conditions that large flooded evaporators often see at night or during part-load operation.
Q: Do I need flow straighteners?
A: No. Coriolis meters are immune to swirl and velocity profile effects. A short run of 2 to 3 pipe diameters is enough for mechanical alignment and stress-free installation.
Q: How can I get a sizing check quickly?
A: Email your pressure (bar), temperature (°C), pipe size (DN), and min-max flow range (kg/h) to [email protected]. We normally reply within 12 hours with a datasheet and a budget price.
Q: Which certifications are available for projects in the Middle East or Southeast Asia?
A: We offer ATEX, IECEx, and CE marking. SIL2 functional safety certification is an optional add-on. For country-specific approvals, please speak with our sales team directly.
Contact Silver Automation Instruments. Tel: +86-25-68650347 | Whatsapp: +86-25-52155837 | WeChat: +86 15365082610. Visit our main site flow-meter.com.au or flow-meter.com.au for full product ranges and technical notes.