1. Introduction
User Manual Basic Principles of Operating for the Polycold Refrigeration Cycle
3. Separating and throttling the liquid condensate produces cooling that condenses the remaining
vapors in a special heat exchanger. In the process of providing cooling in the Cryocooler, this
mixture is partially evaporated.
4. Throttling this latter condensate and feeding the cryocoil to produce cooling at very low
temperatures
5. Passing the refrigerant leaving the cooling coil back through the heat exchanger to the compressor.
Operating pressures and compressor temperatures are similar to those in air-conditioning systems.
The compressor lubricating oil circulates with the discharge vapors. The oil promptly returns to the
compressor without reaching the very low temperature portions of the system. This eliminates the
common problems of oil plugging in evaporators and expansion devices too often seen in low
temperature systems.
The mixed refrigerant charge is hermetically sealed into the system. Normally neither the refrigerant
nor the compressor lubricating oil requires replacement or recharging.
In this unit, there is a series of intermediate special heat exchangers called cascade condensers.
These are located between the air-cooled condenser and the final cooling coil (cold probe). There are
multiple stages of partial condensation, phase separation, condensate throttling, and intermediate
cooling. In addition, the system has a suction-side refrigerant vapor expansion tank and a discharge-
side receive tank to limit start-up discharge pressures.
Accelerating Innovation 1-2
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