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Showing results for tags 'refrigeration cycle'.
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[Webinar] Basic Refrigeration Sealed System Thermodynamics
Samurai Appliance Repair Man posted an event in Tech Training
untilWho: Professional Appliantologists, Senior Appliantology Fellows, and Legacy Tech members at Appliantology Master Samurai Tech Academy students enrolled in the Refrigerator Repair course Mr. Appliance® Academy students enrolled in Bundle 1 What: Basic Refrigeration System Thermodynamics We're venturing down the rabbit hole- this webinar is the first part in a multi-part webinar series on understanding how the sealed system in a refrigerator works. In this first session, we're going to be laying foundational concepts that will be used in subsequent webinars. So if you miss this one, you'll be lost in the later sessions. In this first part, we're going to discuss and understand: Pressure and vacuum units of measurement Energy and work: BTU vs. BTUH Latent and sensible heats Saturation temperature Boiling point and phase change Enthalpy The Pressure-Enthalpy (P-H) diagram Using the P-H diagram to analyze an ideal refrigeration cycle Refrigerant pressure-temperature saturation tables Superheat and subcooling We'll also look at pressures, superheats, and subcooling at various points around a real-world R134a refrigeration system and plot these on a P-H diagram. You'll need a set of R134a P-T tables or the Danfoss app. When: Monday, October 2, 2017, at 7PM Eastern Time SHARP (adjust your time zone accordingly). Where: All of our web meetings are powered by Join.me. For the connection details, see below. Master Samurai Tech Academy Students: RSVP here. Mr. Appliance® Academy Bundle 1 Students: RSVP here. Professional Appliantologists, Senior Appliantology Fellows, and Legacy Techs: fill out the form below to request connection details:<a data-cke-saved-href="https://mastersamuraitech.wufoo.com/forms/mur05y20li0deq/" href="https://mastersamuraitech.wufoo.com/forms/mur05y20li0deq/">Fill out my Wufoo form!</a> How: Here are three tips to ensure that the webinars are a smooth, cool experience for you: Arrive early to make sure your connection is working! Also, if you show up late for the webinar, you'll be lost. Enter your name at the "knock to enter" window on the meeting page- if you leave it blank, you won't be able to enter. Watch this ultra-short video on how to use your Join.me control console. -
New Appliance Service Manual added: Use of R290/R170 in Lieu of R22/R23 in Cascade Refrigeration Cycles
Samurai Appliance Repair Man posted a topic in Appliance Service Manual Requests Forum
Use of R290/R170 in Lieu of R22/R23 in Cascade Refrigeration Cycles View File ABSTRACT R22/R23 have been predominantly used in cascade refrigeration cycles. Even though the ODP of R22 is not as high as CFCs, it still will be phased out following the Montreal Protocol and its amendments because of the chlorine atoms. Hydrocarbons, such as R170 and R290 are natural working fluids. Thermodynamic analysis on the cascade refrigeration cycle adopted R290/R170 under the evaporation temperature from -80 to -55 and the condensation temperature from 30 to 40 are processed. System performances, such as the maximum COP, the cascade evaporating temperature, the ratio of refrigerants flow rate between high and low temperature circuits and their variations are compared with that of the R22/R23 under the same conditions. Results show that the performances of the two cascade refrigeration cycle are approximately the same. So the R290/R170 can be used as the substituting refrigerants to R22/R23 in the cascade refrigeration cycle. Submitter Samurai Appliance Repair Man Submitted 09/08/2017 Category Appliance Repair Manual Pot Luck Supper -
Use of R290/R170 in Lieu of R22/R23 in Cascade Refrigeration Cycles
Samurai Appliance Repair Man posted a file in Appliance Repair Manual Pot Luck Supper
Version 1.0.0
15 downloads
ABSTRACT R22/R23 have been predominantly used in cascade refrigeration cycles. Even though the ODP of R22 is not as high as CFCs, it still will be phased out following the Montreal Protocol and its amendments because of the chlorine atoms. Hydrocarbons, such as R170 and R290 are natural working fluids. Thermodynamic analysis on the cascade refrigeration cycle adopted R290/R170 under the evaporation temperature from -80 to -55 and the condensation temperature from 30 to 40 are processed. System performances, such as the maximum COP, the cascade evaporating temperature, the ratio of refrigerants flow rate between high and low temperature circuits and their variations are compared with that of the R22/R23 under the same conditions. Results show that the performances of the two cascade refrigeration cycle are approximately the same. So the R290/R170 can be used as the substituting refrigerants to R22/R23 in the cascade refrigeration cycle. -
Comparison of Cooling Parameters of R134a and R290/R600a
Samurai Appliance Repair Man posted a file in Appliance Repair Manual Pot Luck Supper
Version 1.0.0
16 downloads
Abstract: Cooling capacities and other parameters were determined for a refrigeration cycle operating between temperature limits of -25oC (evaporator temperature) and 42oC (condenser temperature). The refrigerants used in the refrigeration cycle analysis were R134a and R290/R600a. Compressor capacity of 125W, degree of subcooling of 9K and degree of superheating of 15K were maintained for refrigeration cycles using R134a and a binary mixture of R290/R600a (50% each by mass). Parameters such as refrigerating capacity, mass flow rate, compression work, condenser capacity and Coefficient Of Performance (COP) were computed for each refrigeration cycle. Flow rate of R134a is higher than that of R290/R600a which indicates its low evaporative specific heat. The cooling capacity of R134a (376.41W) is higher than that of R290/R600a (338.11W). COP of the cycle using R134a is 3.01 which is higher than that of R290/R600a. Suction and discharge pressures of the two refrigerants are fairly close. The analysis showed that cooling capacities of the two refrigerants are close enough and are therefore proposed as substitutes in existing R12 refrigeration systems. Keywords: Refrigeration Cycle, R134a, R290/R600a, Cooling Capacities, Binary Refrigerants -
New Appliance Service Manual added: Comparison of Cooling Parameters of R134a and R290/R600a
Samurai Appliance Repair Man posted a topic in Appliance Service Manual Requests Forum
Comparison of Cooling Parameters of R134a and R290/R600a View File Abstract: Cooling capacities and other parameters were determined for a refrigeration cycle operating between temperature limits of -25oC (evaporator temperature) and 42oC (condenser temperature). The refrigerants used in the refrigeration cycle analysis were R134a and R290/R600a. Compressor capacity of 125W, degree of subcooling of 9K and degree of superheating of 15K were maintained for refrigeration cycles using R134a and a binary mixture of R290/R600a (50% each by mass). Parameters such as refrigerating capacity, mass flow rate, compression work, condenser capacity and Coefficient Of Performance (COP) were computed for each refrigeration cycle. Flow rate of R134a is higher than that of R290/R600a which indicates its low evaporative specific heat. The cooling capacity of R134a (376.41W) is higher than that of R290/R600a (338.11W). COP of the cycle using R134a is 3.01 which is higher than that of R290/R600a. Suction and discharge pressures of the two refrigerants are fairly close. The analysis showed that cooling capacities of the two refrigerants are close enough and are therefore proposed as substitutes in existing R12 refrigeration systems. Keywords: Refrigeration Cycle, R134a, R290/R600a, Cooling Capacities, Binary Refrigerants Submitter Samurai Appliance Repair Man Submitted 09/08/2017 Category Appliance Repair Manual Pot Luck Supper