应用潜热型功能热流体的液冷服散热性能分析

Analysis on Heat Transfer of Latent Functionally Thermal Fluid Applied to Liquid Cooling Garment

目的研究潜热型功能热流体作为液冷服(LCG)冷却液的散热性能及其影响因素。方法基于Pennes生物热方程建立人体躯干穿着液冷服的传热模型,通过对比各种条件下的液冷服散热量、液冷服效率、冷却液温度和人体皮肤温度等参数,分析液冷服的散热性能以及人体热舒适性。结果相比以水为冷却液,潜热型功能热流体可以显著提高液冷服散热能力,减小所需冷却液流量以及泵功;采用较高的流体入口温度,减小皮肤温差,提高人体热舒适性;代谢产热在较大范围内波动有较强的热缓冲能力。结论潜热型功能热流体可以明显改善液冷服的散热性能,提高航天员的热舒适性,在航天生保系统中具有重要的应用与前景。

Objective To investigate the heat transfer performance of liquid cooling garment（LCG） with latent functionally thermal fluid as the cooling media and its effect factors.Methods Based on Pennes bio-thermal equations,a heat transfer model of torso wearing LCG was built.By the comparison of the LCG heat removed,heat efficiency of LCG,liquid temperature and skin temperature under different conditions,the heat transfer and thermal comfort characteristics were analyzed.Results By contrast to water,latent functionally thermal fluid was able to improve the cooling performance and decrease the required mass flow rate obviously;a higher inlet temperature of fluid and the decrease of temperature difference with skin would improve the comfort of body;the heat buffer ability of functionally thermal fluid was better than that of water when the metabolic fluctuated.Conclusion Latent functionally thermal fluid can improve the heat transfer performance of LCG and the comfort of astronaut which shows that it is of significant application in aerospace life support system.