Abstract
The valved linear compressor (VLC) is one of the crucial components in the 4 K JT cryocooler (JTC) that is utilized for deep space applications. When the structural parameters of VLCs are determined, changing the operating parameters is an effective and simple method for optimizing the output performance. A 4 K JTC is usually driven by a two-stage VLC unit (TVLC) with optimized input parameters (frequency and piston stroke). The TVLC output performance was tested independently before being connected in series to the JT load. Then, the effects of frequency and stroke on the cooling capacity were studied. The tests give some quantitative results of the different cooling temperature affected by the operating parameters. With increases in f1 and f2, the total pressure ratio and the mass flow of the TVLC gradually decreased. An optimal combination of the two frequencies exists for minimizing the electric power input, while the cooling temperature satisfies the demand. Additionally, the total pressure ratio, mass flow and electric power input increase by increasing the piston displacement amplitude (PDA).
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