【Mechanical Equipment Technology Edition】Daily Question 20170809: Refrigeration Principles (5)
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This post was last edited by YORK Industrial Refrigeration on 2017-8-8 at 09:14. Starting from now, in order to enhance communication among users, a \"Question of the Day\" activity has been launched on the Mechanical Equipment Technology forum. We hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth for active participation, 10 wealth for correct answers. This question is valid for two days; no scoring will be given after that. Title: The diagram below shows the pressure-enthalpy diagram most widely used in refrigeration; please analyze the thermodynamic process of evaporation based on this diagram. http://p1.so.qhimgs1.com/t01e5e56369de0b6c61.jpg Answer: Content hidden in this post Content hidden in this post Content hidden in this post Content hidden in this post Content hidden in this post Heat absorption at constant temperature and pressure ================================ Promotion: Petrochemical sector – “Creative Ideas for Energy Saving” campaign (the second phase is currently in progress). http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal chemical industry – “My Technical Upgrades”. http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
I really don’t understand this; I hope to learn it!*
The compressor in a refrigeration system serves to compress and transport the refrigerant vapor, thereby creating a low pressure in the evaporator and a high pressure in the condenser. It is the heart of the entire system ； The expansion valve (throttle valve) thins and reduces the pressure of the high-pressure liquid refrigerant, while also regulating the flow rate of it into the evaporator ； The function of the evaporator is to generate cold energy; the refrigerant absorbs heat from the medium to be cooled within the evaporator, thereby achieving the purpose of producing cold air ； The condenser is responsible for outputting
4-1 Increase in enthalpy at constant pressure
1-2 Adiabatic compression process 2-3 Isobaric heat release process 3-4 Constant h 4—1: The refrigerant absorbs heat at constant pressure in the evaporator
The high-pressure liquid is depressurized in the expansion valve, turning into a superheated liquid before entering the evaporator, thus restarting the initial cycle.