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    Explain "Overcooling" and "Overheating"-The Basics

    Explain "Overcooling" and "Overheating"-The Basics Misunderstanding: subcooling ≠ condenser inlet temperature-condenser outlet temperature The so-called "undercooling": That is, the saturated liquid after condensation is re-cooled through a certain device (such as a subcooler) and method to make its temperature lower than the saturation temperature under condensing pressure, which is called supercooling. Comparing the temperature of the liquid before supercooling with the temperature after supercooling, the difference is "degree of supercooling". As shown: 1. The benefits of supercooling: 1. Reduce the flash gas generated by the refrigerant liquid during throttling, reduce the specific volume of the volume occupied by the flash gas, and increase the unit cooling capacity; 2. Improving the superheat of the return air at the same time has certain advantages for protecting the compressor from wet stroke operation. Second, how does supercooling do in actual design? 1. Special supercooler: In larger refrigeration systems, in order to reduce the temperature of the refrigerant liquid entering the throttle valve and reduce the flash gas generated during or after throttling, the refrigeration efficiency is appropriately improved. In the process design, after the accumulator (The system that uses the throttle valve to throttle must have a liquid reservoir) A special equipment for supercooling-a supercooler is added. Its structural type is casing type, spray type or plate change, etc. The principle is to use cooling water with a lower temperature than the saturated liquid after condensation (such as deep well water), which can generally be lowered by 3℃~5 than before cooling. The temperature of ℃ (that is, the degree of supercooling is 3℃～5℃). As shown: 2. Heat exchange between liquid supply pipe and return pipe There are also some small-scale fluorine refrigeration systems, although there is no special supercooler, but the liquid supply pipe and the return air pipe are wrapped together to insulate the temperature. The low temperature of the return air pipe is used to reduce the temperature of the liquid in the liquid supply pipe. The expansion valve is installed directly in the warehouse and passes through, and is cooled again to achieve the purpose of supercooling, thereby improving the refrigeration efficiency. At the same time, the temperature of the return air pipe is also heated to prevent the compressor from inhaling too much steam and may cause liquid shock. In the capillary throttling system, the capillary tube and the air return tube (suction tube) are merged together, and they are welded together (this method is used by Daikin VRV), and they are covered with a hot rubber sleeve, and there is a secondary air tube Some of them pass through, and some are wound on the air return tube, and some pass the capillary tube or liquid supply tube directly in the box. The heat exchange between the capillary tube and the return air pipe makes the liquid refrigerant before throttling and the low temperature refrigerant vapor in the return air pipe perform heat exchange cooling to obtain supercooling, which can reduce the liquid liquid that may be entrained in the return air pipe to hit the compressor. At the same time, it can achieve the purpose of supercooling the liquid refrigerant before throttling. Of course, there are also regenerators, the principle is the same, please see the following figure: 3. Increase the condenser If the condenser is intentionally enlarged, it is also feasible to leave space to be cooled again and supercooled. However, this will not be done in a standardized design. The consideration is to minimize the overall volume and weight and reduce manufacturing costs. For small or micro capillary throttling systems, no special subcooler will be added. overheat: The difference between the saturation temperature before overheating and the saturation temperature after overheating is called the degree of superheat. Under certain pressure, steam whose temperature is higher than saturation temperature is called superheated steam. The steam temperature at the exhaust pipe of the refrigeration compressor is generally higher than the saturation temperature, so it belongs to superheated steam, which is called "exhaust gas superheat". 1. Harmful overheating: Due to the length and degree of heat insulation of the return air pipe (inhalation pipe), the steam in the pipe is transferred to the outside and heated. This phenomenon is called "inhalation overheating" or "pipe overheating". This overheating will increase the suction temperature of the compressor and increase the specific volume of the suction steam, resulting in a decrease in the cooling capacity per unit volume and a reduction in the cooling capacity of the compressor, which is detrimental to the refrigeration cycle. This problem is called "Harmful overheating". Therefore, it is required to insulate the suction pipe and shorten the length of the suction pipe as much as possible to reduce this harmful overheating. 2. Beneficial overheating: In a fluorine refrigeration system using an expansion valve, the degree of superheat is used to adjust the opening degree of the thermal expansion valve. This phenomenon is called "beneficial overheating". Similarly, the superheat generated by the fluorine steam after recuperation is also beneficial superheat. The basics will be shared here today, and next time we will teach you how to use excel to calculate supercooling and overheating. [1] Use excel to get the moisture analysis coefficient of heat and moisture exchange! [2] Surprise! Method of drawing pressure enthalpy diagram by using excel [3] Teach you to use excel to directly select the compressor 【4】Excel curve fitting to obtain refrigerant properties [5] Absolutely! Using excel, draw the enthalpy chart [6] Use the selection software to call up the ten coefficient of the compressor

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