Retrofitting on Thermal compressors
#1

presented by :
Mr. DHRUV M. PATEL

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RETROFITTING ON REFRIGERATION & AIRCONDITION COMPRESSORS
• Retrofitting a R502 Refrigeration plant to R507
• R- 12 Retrofit with ISCEON MO49
• R-12 compressors Retrofitted with R134a
• Retrofitting a CFCs Refrigeration & Air-condition plant to HCFCs
• GENERAL RETROFIT INFORMATION
• SYSTEM MODIFICATIONS
• SYSTEM SUPERHEAT
• SYSTEM OIL MANAGEMENT
• REFRIGERANT RECOVERY INFORMATION
• EXPECTED PERFORMANCE AFTER RETROFIT
PROCEDURE FOR RETROFITTING
1. Establish baseline performance with existing Refrigerant.
 Use the system data sheet
 Note the oil type in use & system operating data
 Check for existing leaks and repair
2. Remove existing Refrigerant change from system
 Use the Recovery cylinder
 Weight amount of removed Refrigerant
PROCEDURE FOR RETROFITTING
3. Replace the filter & dryer
 check elastomeric seals
 Check that oil is in good condition,replace if necessary
4. Evacuate system and check for leaks
 Does the system hold a vacuum?
 Does the system hold a pressure?
 Break vacuum with dry nitrogen,pressurize to below the system design pressure
PROCEDURE FOR RETROFITTING
5. Charge system with alternative refrigerant
 Note amount of refrigerant charged
6. Adjust refrigrant charge to achieve the same superheat as the original system
7. Monitor oil levels in compressors if necessary add original oil to attain normal operating level.
8. Label system cleary.ensure system data sheet is completed & filed securely.
RETROFITTING PERFORMANCE RESULT
• Quantitative comparisons were made among 5- to 15-minute performance runs with both refrigerants.
• Pairs, each consisting of an R-12 run and an R-134a run, were selected for similar running conditions (less than 4-percent variation in ambient and pre-evaporator air temperature). The pairs were then separated into their own refrigerant categories, providing two comparable groups of 10 each. COPs were calculated and plotted from lowest to highest values in each group. Because of the lack of controlled heat and ventilation loads, these factors were not included in the calculations.
• The efficiency and capacity of R-134a and R-12 appear to be comparable. Slightly more energy was used with R-134a to remove moderately more heat from the air R-134a exhibited an average postevaporator temperature that was 2.2 deg C lower than that of R-12. The R-134a group runs and the R-12 group runs exhibited COPs of 3.21 and 3.06, respectively. Thus, the relative COP of R-134a was 5 percent greater than that of R-12 for these specific data. When retrofitting to R-134a, some impurities were found to have accumulated in the liquid line filter, which may have somewhat impeded the performance with R-12.
• LABOR TIME CONSIDERATION RETROFITTING TO A R-134A
• COST CONSIDERATION OF MAKING RETROFITTING TO A R-134A
ADVANTAGES OF RETROFITTING R-134A INPLACE OF R-12
 By using R-134a it gives the 5% higher coefficent ratio than R-12.
 It gives the higher reliability.
 Time Required for colling is less than R-12.
 It also obey the ozen depletion law EU-2014.
 Easy to handling & transportation.
 Temperature to pressure ratio higher than R-12.
DISADVANTAGES OF RETROFITTING R-134A INPLACE OF R-12
 Higher capital cost Required in R-134a.
 power consumption required for operating the system is higher than R-12.
 Best lubrication system is increase the cost.
CONCLUSION
• Easy to balance ozone depletion layer.
• Get Higher performance.
• By Retrofitting, We can generate the higher strength of the system.
• Retrofitting with HFC R-134a would require fewer work hours, less system downtime, and would be less expensive than retrofitting with HCFC R-22 or replacing entire systems. It is preferable to retrofit with R-134a rather than with MP39 for factors discussed previously.
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