Experimental study demonstrates competitive cooling efficiency in free piston Stirling coolers using non-metallic regenerators, suggesting lower-cost civilian refrigeration options.
Background: Due to the recognition and further promotion of green and low-carbon concepts worldwide, Stirling refrigeration technology has gained people's attention for its significant advantages, such as high cooling capacity, high efficiency, and strong reliability. In recent years, related products have gradually entered the field of civilian low-temperature refrigeration. One of the key research directions is to achieve better refrigeration performance at lower costs. Purpose: Through simulative analysis and experimental verification, Free piston Stirling refrigerators (FPSCs) have better economic and performance advantages using non-metallic materials. Method: This paper analyzes an FPSC using Polyethylene naphthalate (PEN) material. The main losses and performance of the regenerator are analyzed about the impact of packing porosity and regenerator length. The actual performance obtained through experimental verification is compared with an FPSC with metal packing. Conclusion: Experimental verification was conducted, and it was found that FPSC using non-metallic materials with a porosity of 52.4% had better performance. Some details of the patent are shown in the article. The COP of 25w@-76℃ is 0.16, which is close to the performance of the PFSC using 200 mesh wound wire.
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Guo et al. (2024) studied this question.
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