Maricopa Community Colleges  HVA245   19962-20046 
Official Course Description: MCCCD Approval: 10/28/03
HVA245 19962-20046 LEC 3 Credit(s) 3 Period(s)
Refrigeration Cycle Analysis
Pressure-enthalpy chart and its component parts, vapor compression system, cycle analysis of a single saturated cycle. Actual refrigerating cycles and pressure-enthalpy analysis of chloroflurocarbon (CFC) and hydroflurocarbon (HCFC) replacements. Prerequisites: None.
Go to Competencies    Go to Outline
 
MCCCD Official Course Competencies:
 
HVA245   19962-20046 Refrigeration Cycle Analysis
1. Describe the refrigeration process, component parts, and their function. (I)
2. Evaluate refrigeration system capacity. (II)
3. Explain the component parts of the pressure-enthalpy (p-h) diagram and function of the chart. (III)
4. Plot a simple saturated refrigeration cycle on the p-h chart. (IV)
5. Evaluate the processes of the refrigeration cycle. (V)
6. Compare and contrast the processes to increase condensing Zemperature and to decrease suction temperature. (VI)
7. Calculate effects of superheating during the refrigeration cycle. (VII)
8. Compare and contrast a simple saturated cycle with a super- heated cycle. (VIII)
9. Calculate the effects of subcooling. (IX)
10. Compare and contrast the simple saturated cycle with a subcooling cycle. (X)
11. Evaluate the effects of a liquid to suction heat exchange. (XI)
12. Evaluate the effects of pressure loss resulting from friction within the refrigeration cycle. (XII)
Go to Description    Go to top of Competencies
 
MCCCD Official Course Outline:
 
HVA245   19962-20046 Refrigeration Cycle Analysis
        1. Refrigeration process
      A. Process
      B. Components
      C. Function
    II. System capacity
        A. Mass flow rate
        B. Volume flow rate
        C. Refrigeration effects
            d. Compressor capacity
      III. Pressure-enthalpy diagram of function of chart
          A. Regions
            1. Subcooling
            2. Saturated mix
            3. Superheated
          B. Identify lines
          C. Function of chart
        IV. Saturated refrigeration cycle
            A. Simple refrigeration cycle
            B. Plotting cycle
            C. p-h diagram
          V. Refrigeration process
              A. Vaporizing process
              B. Compression process
              C. Expansion
              D. Condensing
              E. Theoretical power
              F. Coefficient of performance
            VI. Refrigeration cycle processes
                A. Increase in condensing with a contrast suction
                B. Decrease in vaporization with a contrast condensing
              VII. Superheating during the refrigeration cycle
                  A. Calculate effects of superheating
                    1. qe (British Thermal Unit - evaporator)
                    2. qw (Work)
                    3. qc (Condenser)
                    4. Theoretical power
                    5. COP (Coefficient of performance)
                VIII. Simple saturated cycle versus superheated cycle
                    A. qe (British Thermal Unit - evaporator)
                    B. qw (Work)
                    C. qc (Condenser)
                    D. Theoretical power
                    E. COP (Coefficient of performance)
                  IX. Subcooling during the refrigeration cycle
                      A. qe (British Thermal Unit - evaporator)
                      B. qw (Work)
                      C. qc (Condenser)
                      D. Theoretical power
                      E. COP (Coefficient of performance)
                    X. Subcooling cycle versus a saturated cycle
                        A. qe (British Thermal Unit - evaporator)
                        B. qw (Work)
                        C. qc (Condenser)
                        D. Theoretical power
                        E. COP (Coefficient of performance)
                      XI. Effects of liquid to suction heat exchanger
                          A. Subcooling liquid region
                          B. Superheated region
                          C. Capacity changes
                            1. qe (British Thermal Unit - evaporator)
                            2. qw (Work)
                            3. qc (Condenser)
                            4. Theoretical power
                            5. COP (Coefficient of performance)
                        XII. Effect of pressure loss
                            A. Evaporation
                            B. Suction line
                            C. Discharge line
                            D. Condenser
                            E. Metering device
                            F. Capacity of system
                              1. qe (British Thermal Unit - evaporator)
                              2. qw (Work)
                              3. qc (Condenser)
                              4. Theoretical power
                              5. COP (Coefficient of performance)
                        Go to Description    Go to top of Competencies    Go to top of Outline