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Our customer claims oil is plugging his filter drier. They are currently running a split system (10 ton nominal) with a rotary compressor and oil separator. The oil separator is rated at 98% efficiency. The system is running on R22 with Sunesco 3GS mineral oil. I have requested a sample from the...

We have a customer that is currently setting up a 10ton R22 cooling system using mineral oil. In future, they will be switching to R407c systems which use POE oil. Is it possible to run the R22 system with POE oil? What are the anticipated concerns? We would have an oil separator at the...

I understand the major components of the refrigeration cycle should be sized to match the cooling load. What is the downside to using a compressor that is too big for the application or an evaporator for that matter?

I have the performance data of a small DC powered centrifugal forward curve fan. According to this data, the rpm increases and amp draw decreases as the static pressure increases. The voltage is constant at 13.5vdc. I would have expected the fan to run at full speed with no static pressure and...

I have converted the data collected from a 1 hour long test in my DAQ (data aquisition)system. I have collected 29 different data points. The default orientation of Excel is to put the headings across the top and the readings below this. Since I have thousands of readings this makes sense to me...

Does anyone have a torque value table for brass fasteners? I am specifically looking for 5-16"-18 brass to mount a ground lug to the stud. I would like the preload and finish torque values.

Does anyone out there know of a DC power hermetic or open drive compressor that produces 6000 btu cooling?

Will increasing the size of my condenser in a small system (.50 ton) reduce the head pressure or simply provide more subcooling?

I have two similar 2D drawings in AutoCAD 2000. Both drawings have been purged. However, one drawing is 300 kbytes and the other is 2500 kbytes. How can I clean up the second file?

Does anyone know of a good site calculator to determine static pressure losses in flexible duct?

A box 10ft.x7ft.x6.5ft.high on the back of a truck. Walls and ceiling insulated with R5 and floor insulated with R3. Outside temp 0ºF. Assume 10% infiltration. One mandoor and not ventilation. What is heat load to maintain 70ºF in box with 200cfm fan? Secondly, if we assume the box is...