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    Compression Ratio, Capacity and Volumetric Efficiency of the Refrigeration Compressor

    Compression Ratio, Capacity and Volumetric Efficiency of the Refrigeration Compressor Piston Displacement, Compressor Capacity, Clearance Volume of Compressor Introduction This article describes some important terms related to the refrigeration and air conditioning compressors. These are compression ratio, capacity and volumetric efficiency of the compressor. Piston Displacement or Compressor Capacity The capacity of the compressor is very important parameter, since the capacity of whole refrigeration or the air conditioning plant depends on it. The capacity of the reciprocating compressor depends on the diameter of the cylinder bore, the length of the piston stroke inside the cylinder, number of cylinders in the compressor and the speed of rotation of the crankshaft. Piston displacement of the reciprocating compressor is the volume swept by the piston inside the cylinder in unit time and it is same as the capacity of the compressor. The piston displacement or the capacity of the compressor can be expressed in cubic meter per min (m3/min), cubic meter per sec (m3/sec), cubic feet per minute (cfm) or liters per second (lps). In general the capacity of the compressor is given by the formula: Capacity = Π * D2 * L * N * n/4 Where: D is the diameter of the bore of the bore of cylinder - L is the stroke of the piston inside the cylinder, which can also be the length of the bore. - n is the number of cylinders in the compressor - N is the speed of the rotation of the crankshaft that can be expressed in rotations per minute (rpm) or rotations per second (rps) Clearance Volume of the Compressor When the piston reaches top dead center (TDC) position inside the cylinder, it cannot go and touch the extreme end of the cylinder. The piston stroke is performed only till certain length inside the cylinder and small volume inside the cylinder towards its extreme top end remains empty. This volume is called as the clearance volume. The space left between the TDC position of the piston and the discharge valve is called as the clearance volume of the cylinder or compressor. The clearance volume limits the stroke of the piston; hence it reduces the capacity of the compressor as well as its volumetric efficiency. Compression Ratio of the Reciprocating Compressor The compression ratio, R, of the reciprocating compressor is defined as the ratio of the suction pressure of the refrigerant to the discharge pressure of the refrigerant. Thus, R = Absolute suction pressure of the refrigerant/ absolute discharge pressure of the refrigerant Volumetric Efficiency of the Reciprocating Compressor The actual volume of gas inducted inside the cylinder for compression is less than the theoretical calculated volume because of the clearance volume. When the gas is compressed, and is delivered by the discharge valve, not all the gas is discharged since some volume of the gas remains inside the clearance volume at high discharge pressure. When the piston starts moving downwards, the suction valve does not opens immediately because of this high pressure gas. As the piston moves downwards the pressure of the gas in the clearance volume starts reducing due to expansion. Only when the pressure of this gas reaches to certain minimum level, the suction valve opens. Thus the portion of the suction stroke of the piston goes unused and during this certain volume of the refrigerant is not sucked. This reduces the volume of the refrigerant that can be sucked by the cylinder or the compressor. Thus the actual amount of refrigerant sucked by the cylinder is less than the theoretical amount of gas that it could have sucked based on the diameter of the bore and its length. The volumetric efficiency (V) of the compressor is defined as the ratio of the actual volume of gas sucked by it to the theoretical volume that it could have sucked if clearance volume was not present. V = Actual volume of gas sucked by the compressor/ Theoretical volume of the compressor It is clear from the above discussion that more is the clearance volume, less is the volumetric efficiency of the compressor. The volumetric efficiency of the compressor also affects the capacity of the compressor since the capacity is directly dependent on the piston displacement inside the cylinder. Lesser the volumetric efficiency less is the capacity of the compressor. The volumetric efficiency of the compressor also depends on the compressor ratio. If the difference between the suction and the discharge pressure is higher, the refrigerant will remain trapped inside the clearance volume for longer time and prevent the opening of the suction valve. Thus as the compression ratio of the compressor increases, its volumetric efficiency and the capacity reduces. This post is part of the series: Refrigeration and Air Conditioning Compressors

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    Casing inlet and outlet nozzles are normally flanged. The general preference in process service is for all casing connections to be flanged or machined and studded. On steel-cased machines, this normally is not a problem. On the smaller refrigeration comp器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔDž༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔDž'鱤džၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧֐識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴 識杴 㥲ᐲ

    REFRIGERATION COMPRESSOR MARKET 2020 BUSINESS SCENARIO – J & E HALL INTERNATIONAL , SECOP GMBH , TECUMSEH , TERMOTEK GMBH , BITZER , DALIAN SANYO COMPRESSORS , EMERSON CLIMATE TECHNOLOGIES , FISCHER AG-PRAZISIONSSPINDELN , FUSHENG INDUSTRIAL

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    JCMR recently introduced Global Refrigeration Compressor Market study with focused approach on market size & volumes by Application, Industry particular process, product type, players, and production & Consumption analysis considering major factors, cost 器2䀀ￜ皥䖒皦즠Ʋ㉄ᰙ㲈Ʋ䌁皦ᮔDž༬皧㉎ᰙЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔDž'鱤džၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧ጎ識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴 識杴 㥲ᐲ琉蒠S識器 直囬ᐱ囸ᐱ嵭僦㠦ᐲᔇ僦囸ᐱ殺廼僦囬ᐱᙐ僦㠲ᐲ嵥僦直ᙧ僦㠲ᐲ令ᙐ僦㣮ᐲ嵭僦林ᙧ僦㣮ᐲ龍톺珵㥲ᐲ枬  퀖珵林춌珵蓄Cᴨ먢塚赺C直ᵘ먢塚㥲ᐲ礼藚C識直杴 器器蘯C礼器垘ᒣ識靖ﮰ﨤虣C器﯈擜 ﮰ直杴 梅擩 ﯈祖斥 ﯈ﯤ未 ﯈ꍀᒥ㭸ᅗ䠠  뤂ᐱ ᧪ᐲ 뤂ᐱ 㥲ᐲ 뤂ᐱ ᧪ᐲ 뤂ᐱ ᧪ᐲ 㗚ᐲ煔क़㱴ᅗ 뤂ᐱ ￿ ￿曐ᅤﱄﱈ㕐ϵĂ⿬ᒢﱐὣ¢ﰸﱄﯰ⁝¢ﱐﯼ⃶¢ﱐﱘ↯¢ﱐꍀᒥﺨᾃരΞᒣ࿢΄৸ț篈ΐ㕐ϵ碬ᾮﲨLﱤLﲨﱰLﲨﱼLﲨﲰLﲨꍀᒥ᫰眃뀿䂸ᅗﹸᾃĀﴐ驿d︬骞dﴐ࿢΄�省䘢珋栄Ο4䘾珋ꏦ⚱ꃸÙ߮46栄Ο삁߮ﴘ壠Λﴨ⍲Mﵔ퉳癘߮ꯍ�࿢΄︼癖࿢΄߮耣꧋蒐Ƚﻠ︤ꃸÙ菟꧋︔菟꧋﶐荫꧋︈ᕰ癙⽧�$0￿￿￿￿癖࿢΄৸ț耀耀߮耣꧋߮ﺠᕰ癙ㄏ�ﺰ癖࿢΄肯꧋ﻠ壠Λ肷꧋�癖ﹰ࿢΄﹠ᕰ癙＄ᕰ癙ハ�￾￿ﺼ�癖縟꧒߮ꌈdﻠĀＬĞĞ壠Λꍋd߮嶁㺀ʐȩ鐸ĢꚆd０ꚐdＬＴꛉdＬĞĞ鐸Ģ壠ΛﾀĞｰĞﾀ퀀'⚌Μ缬Κ纼Κ缬Κ纼Κￌ颌@ﾀﾔ拄珋퀀'抠珋ꅂ⚱ￜ؉省퀀'ꯀ鮺퀀'ꯀ鮺ﾠ￤巠眂⥜￬ה省￿￿┾眃Ğ퀀'捁硴 ㋔Ü 4żᨦʘDˠɔ熺ԴJր̶䥛ⵙࢸ2࣬ˮ㋎௜Bఠ̤忈㡐ང^ྤ͖Մ넨ዼVፔΆ ìżᖘ᜔ޠẴຌⵀ̔ご˜レÌㆸð ㊨( ㋐獓摈,Œᕠ,^^$8C:\Windows\WinSxs\ᨦĜDŤɔ熺θJЄ̶䥛ⵙܼ2ݰˮ㋎੠Bત̤忈㡐෈^ศ͖Մ넨ᆀVᇘΆMicrosoft.Windows.SystemCompatiblelĆǐ,˖漠쉮�Ǒ²̄Microsoft.Windows.SystemCompatible,processorArchitecture="x86",publicKeyToken

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    Fake products give your business as well as our company a bad name. Therefore, we are doing everything we can to fight the counterfeits. Danfoss' Intellectual Property department is constantly filing lawsuits against counterfeiters who are caught selling 器2䀀ￜ皥䖒皦즠Ʋ㉄ᰙ㲈Ʋ䌁皦ᮔDž༬皧㉎ᰙЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔDž'鱤džၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ

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    Cold Controls (thermostats) are subject to the LVD directives, meaning they must be tested according to this Directive so that customers can feel safe and secure during buying and installing these Cold Controls. Danfoss Cold Controls also called 077B to器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔDž༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ￿￿뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔDž'鱤džၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧޾識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴 識杴 㥲ᐲ

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