Gravity assisted heat pipe mixing working medium

Abstract

The invention provides a gravity assisted heat pipe mixing working medium. The mixing working medium contains HC1270 and HFC236fa, as well as HFC32, HFC152a, HFO1234ze or HFO1234yf. The working medium has good thermal stability, safety and no toxicity, and meets the requirement of environmental protection, wherein ODP is 0, and GWP is low. The mixing working medium has moderate saturated vapor pressure, proper heat transfer performance, high M' criteria number for reflecting thermal physics and heat transfer comprehensive performance at the working temperature of 0 DEG C to 100 DEG C, and has good heat transfer properties and transport properties.

Description

technical field [0001] The invention relates to a heat pipe working medium, more specifically, relates to a normal temperature gravity heat pipe working medium containing HC1270 and HFC236fa. Background technique [0002] A gravity heat pipe is a heat exchanger that utilizes phase change for efficient heat transfer. It consists of three parts: evaporating section, adiabatic section and condensing section. When working, the heat source is at the lower end and the cold source is at the upper end. It can realize self-circulation work without external power, and is a static device. Gravity heat pipe heat exchangers working in the range of 0-100 °C have broad development space. The normal-temperature gravity heat pipe can effectively cool base stations and electronic equipment, realize high-quality indoor and outdoor heat exchange of hot and cold air to reduce air-conditioning energy consumption, effectively utilize industrial low-temperature waste heat, and develop geothermal ...

AI Technical Summary

Problems solved by technology

At present, from the perspective of thermophysical properties, the working fluids suitable for working at 0-100°C in normal temperature gravity heat pipes mainly include water, ammonia, methanol, ethanol, acetone, toluene and Freon-like substances R22, etc. These working fluids have their own insurmountable shortcomings: The starting temperature of water is high, which is more suitable for the working environment of 50-200 ℃, and it is not compatible with carbon steel, which will increase the cost of heat pipes; ammonia, methanol, ethanol, acetone and toluene are mostly toxic and flammable substances, which are difficult to Large-scale popularization and application; R22 has been widely used in refrigeration, air conditioning and heat pump systems. Compared with the above substances, it has obvious advantages in safety, stability and compatibility with heat exchanger materials, but due to its damage Atmospheric ozone layer, exacerbation of greenhouse effect and other reasons have been banned in developed countries, and developing countries are also facing the problem of gradually banning; moreover, R22 is more suitable for the range of 0-60 ℃, because when the evaporation temperature is above 60 ℃, its corresponding The saturation pressure will be higher than 2.5MPa, such as 2.99MPa at 70°C

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