【Mechanical Equipment Technology Edition】Daily Question 201708024: Parameters Essential for Refrigeration Maintenance – Superheat. Wealth + Haichuan Coins! !
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Starting today, in order to enhance communication among those interested in marine equipment, we have launched the 【Question of the Day】 initiative on the Mechanical Equipment Technology forum. We hope everyone will participate actively so as to progress and improve together! ! ! Rewards: 3 wealth for active participation, 10-15 wealth for accurate answers. This question is valid for two days; no scoring will be given after that. Question: “Overheating” refers to the increase in temperature of the low-temperature, low-pressure gas of the refrigerant at the evaporator outlet, up to the level of the temperature at the compressor inlet. From this, two parameters of great significance for refrigeration maintenance arise: \"suction superheat\" and \"exhaust superheat\". What is your understanding of superheat and superheat levels? It is best to analyze it in conjunction with a pressure-enthalpy diagram (highest score plus wealth and HaiChuan coins)! If you want to learn more in depth, we can talk privately. http://down.hcbbs.com/attachment/forum/201708/23/101448edsy69v363tdvode.gif Answer: The hidden content in this post – 1,2,3,4 – shows no overheating, while 1’,2’,3’,4’ exhibit overheating as well as undercooling; the overheating period is 1-1’. Point 1 represents the gas saturation point, that is, the point where the superheat is equal to 0. The suction superheat can be calculated at point 1’. This point lies in the gas region, which not only increases the cooling capacity per unit volume but also reduces the occurrence of wet compression. The optimal exhaust superheat can be determined through the suction superheat; exhaust superheat is a very important parameter in refrigeration systems! ! ! ! ! (Those interested can communicate privately) ================================ Event promotion: Petrochemical Zone – “Creative Ideas for Energy Savings” event (the second phase is currently in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal Chemical Industry Event – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
In terms of the properties of water and water vapor, superheat refers to the degree to which the temperature of the vapor is higher than the saturation temperature at that pressure. For water and water vapor, their saturation curve on a steam chart is an upward-sloping curve; that is, as pressure increases, the saturated temperature of water also increases. Similarly, when water vapor is already in a superheated state, if the pressure is increased, its corresponding saturation temperature also rises; as a result, the degree to which its temperature exceeds the saturation temperature decreases, that is, the superheat of the vapor is reduced.
Leave a mark, learn a bit – this was only analyzed in college
Excessive inhalation, in order to prevent liquid slugging; excessive exhaust temperature, to improve oil-gas separation efficiency
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