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Avi Friedman Master’s Student Mechanical Engineering Room: 1337 ERB 443.810.6875 Hometown: Owings Mills, MD Thesis: Design and Development.

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Presentation on theme: "Avi Friedman Master’s Student Mechanical Engineering Room: 1337 ERB 443.810.6875 Hometown: Owings Mills, MD Thesis: Design and Development."— Presentation transcript:

1 Avi Friedman Master’s Student Mechanical Engineering Room: 1337 ERB agfriedman@wisc.edu 443.810.6875 Hometown: Owings Mills, MD Thesis: Design and Development of a Next Generation High Capacity, 20K Pulse Tube Cryocooler

2 Motivation Currently, space cryocooling limitations exist due to the lack of high capacity, low temperature, and highly efficient cryogenic cooling systems. In particular, current state-of-the-art 20 Kelvin cryocoolers have a heat load capacity of 1 Watt at 20 Kelvin with a specific power of 180 W/W. However, 20 Kelvin cryocoolers with a heat load capacity of at least 20 Watts, with a specific power of approximately 100 W/W, will be required for future exploration missions.

3 What is a Pulse Tube Cryocooler? Advantages over other cryocoolers: Operates at low frequency's Capable of high efficiency's No moving parts at the cold end How it works: On one end Helium (He) is compressed and heat is rejected in the aftercooler. On the other end the pulse tube acts as a piston and expands the He which then passes through the cold heat exchanger (HX) and cools the load. The regenerator accepts or rejects heat from/to the He depending on the stage in the cycle. The inertance tube and reservoir keep the pressure in the correct phase with the mass flow rate.

4 Objectives Thoroughly design and parametrically study, a complete two-stage pulse tube cryocooler (PTC) with a 5W or larger cooling capacity at 20K Perform an in-depth investigation of the regenerators at pore and component levels, particularly with regards to the lower temperature stage regenerator which will contain filler material made from rare Earths (Er0.5-Pr0.5, for example) Fabricate and test the most critical components of the system such as the regenerator and the pulse tube for thermodynamic and structural performance Perform an in-depth experimental analysis of the critical components Fabricate and test a prototype of the designed 5 W at 20 K cryocooler in its entirety Concurrently with the design/demonstration/fabrication of the 5 W, 20 K cryocooler, thoroughly design and theoretically demonstrated a 20 W 20 K pulse tube cryocooler


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