Development of a Medium-Scale Collins-Type 10 K Cryocooler

Collins Cryocooler Design for Zero-Boil-Off Storage of Liquid Hydrogen and Oxygen in Space

“…A schematic diagram of the original 10 K Collins-style machine presented by Hannon et al [4] is shown in FIGURE 1a. The design consists of three separate expander/heatexchanger stages all fed working fluid in parallel from a single compressor.…”

“…In FIGURE 2a, an ideal gas enters an ideal adiabatic expander at temperature T 1 and pressure P 1 with a mass flow rate m , is expanded to P 2 , and then passes through an ideal heat exchanger in contact with a thermal load at a uniform [4], intended to provide cooling to a load at 10 K (=T 3 ). This is easily seen through the simple models shown in FIGURE 2.…”