2008 ASHRAE Handbook HVAC SytemsandEquipment Chapter25

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HVAC Sytems and Equipment Handbook – Chapter 25. Air-to-Air Energy Recovery Equipment

Published By	Publication Date	Number of Pages
ASHRAE	2008	25

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1	Applications Applications Table 1 Applications for Air-to-Air Energy Recovery Table 1 Applications for Air-to-Air Energy Recovery
2	Basic Relations Basic Relations Fig. 1 Airstream Numbering Convention Fig. 1 Airstream Numbering Convention Fig. 1 Airstream Numbering Convention Fig. 1 Airstream Numbering Convention Heat Recovery Ventilators Heat Recovery Ventilators Energy Recovery Ventilators Energy Recovery Ventilators
4	Ideal Air-to-Air Energy Exchange Ideal Air-to-Air Energy Exchange Airflow Arrangements Airflow Arrangements
5	Fig. 2 Heat Exchanger Airflow Configurations Fig. 2 Heat Exchanger Airflow Configurations Fig. 2 Heat Exchanger Airflow Configurations Fig. 2 Heat Exchanger Airflow Configurations Effectiveness Effectiveness Rate of Energy Transfer Rate of Energy Transfer
6	Additional Technical Considerations Additional Technical Considerations Air Leakage Air Leakage Fig. 3 Air Leakage in Energy Recovery Units Fig. 3 Air Leakage in Energy Recovery Units Fig. 3 Air Leakage in Energy Recovery Units Fig. 3 Air Leakage in Energy Recovery Units Air Capacity of Ventilator Fans Air Capacity of Ventilator Fans
7	Pressure Drop Pressure Drop Maintenance Maintenance Filtration Filtration Controls Controls Fouling Fouling Corrosion Corrosion Condensation and Freeze-Up Condensation and Freeze-Up
8	Frost Blockage and Control in Air-to-Air Exchangers Frost Blockage and Control in Air-to-Air Exchangers
9	Performance Ratings Performance Ratings Design Considerations of Various ERV Systems Design Considerations of Various ERV Systems Fixed-Plate Heat Exchangers Fixed-Plate Heat Exchangers
10	Fig. 4 Fixed-Plate Cross-Flow Heat Exchanger Fig. 4 Fixed-Plate Cross-Flow Heat Exchanger Fig. 4 Fixed-Plate Cross-Flow Heat Exchanger Fig. 4 Fixed-Plate Cross-Flow Heat Exchanger Fig. 5 Variation of Pressure Drop and Effectiveness with Air Flow Rates for a Membrane Plate Exchanger Fig. 5 Variation of Pressure Drop and Effectiveness with Air Flow Rates for a Membrane Plate Exchanger Fig. 5 Variation of Pressure Drop and Effectiveness with Air Flow Rates for a Membrane Plate Exchanger Fig. 5 Variation of Pressure Drop and Effectiveness with Air Flow Rates for a Membrane Plate Exchanger Fig. 6 Rotary Air-to-Air Energy Exchanger Fig. 6 Rotary Air-to-Air Energy Exchanger Fig. 6 Rotary Air-to-Air Energy Exchanger Fig. 6 Rotary Air-to-Air Energy Exchanger Rotary Air-to-Air Energy Exchangers Rotary Air-to-Air Energy Exchangers
11	Fig. 7 Effectiveness of Counterflow Regenerator Fig. 7 Effectiveness of Counterflow Regenerator Fig. 7 Effectiveness of Counterflow Regenerator Fig. 7 Effectiveness of Counterflow Regenerator Coil Energy Recovery (Runaround) Loops Coil Energy Recovery (Runaround) Loops Fig. 8 Coil Energy Recovery Loop Fig. 8 Coil Energy Recovery Loop Fig. 8 Coil Energy Recovery Loop Fig. 8 Coil Energy Recovery Loop
12	Fig. 9 Energy Recovery Capacity Versus Outside Air Temperature for Typical Loop Fig. 9 Energy Recovery Capacity Versus Outside Air Temperature for Typical Loop Fig. 9 Energy Recovery Capacity Versus Outside Air Temperature for Typical Loop Fig. 9 Energy Recovery Capacity Versus Outside Air Temperature for Typical Loop Heat Pipe Heat Exchangers Heat Pipe Heat Exchangers
13	Fig. 10 Heat Pipe Assembly Fig. 10 Heat Pipe Assembly Fig. 10 Heat Pipe Assembly Fig. 10 Heat Pipe Assembly Fig. 11 Heat Pipe Operation Fig. 11 Heat Pipe Operation Fig. 11 Heat Pipe Operation Fig. 11 Heat Pipe Operation Fig. 12 Heat Pipe Exchanger Effectiveness Fig. 12 Heat Pipe Exchanger Effectiveness Fig. 12 Heat Pipe Exchanger Effectiveness Fig. 12 Heat Pipe Exchanger Effectiveness
14	Fig. 13 Heat Pipe Heat Exchanger with Tilt Control Fig. 13 Heat Pipe Heat Exchanger with Tilt Control Fig. 13 Heat Pipe Heat Exchanger with Tilt Control Fig. 13 Heat Pipe Heat Exchanger with Tilt Control Twin-Tower Enthalpy Recovery Loops Twin-Tower Enthalpy Recovery Loops Fig. 14 Twin-Tower Enthalpy Recovery Loop Fig. 14 Twin-Tower Enthalpy Recovery Loop Fig. 14 Twin-Tower Enthalpy Recovery Loop Fig. 14 Twin-Tower Enthalpy Recovery Loop Thermosiphon Heat Exchangers Thermosiphon Heat Exchangers
15	Fig. 15 Sealed-Tube Thermosiphons Fig. 15 Sealed-Tube Thermosiphons Fig. 15 Sealed-Tube Thermosiphons Fig. 15 Sealed-Tube Thermosiphons Fig. 16 Coil-Type Thermosiphon Loops Fig. 16 Coil-Type Thermosiphon Loops Fig. 16 Coil-Type Thermosiphon Loops Fig. 16 Coil-Type Thermosiphon Loops Fig. 17 Typical Performance of Two-Phase Thermosiphon Loop Fig. 17 Typical Performance of Two-Phase Thermosiphon Loop Fig. 17 Typical Performance of Two-Phase Thermosiphon Loop Fig. 17 Typical Performance of Two-Phase Thermosiphon Loop Comparison of Air-to-Air Energy Recovery Systems Comparison of Air-to-Air Energy Recovery Systems
16	Table 2 Comparison of Air-to-Air Energy Recovery Devices Table 2 Comparison of Air-to-Air Energy Recovery Devices Long-Term Performance of Heat or Energy Recovery Ventilators Long-Term Performance of Heat or Energy Recovery Ventilators Selection of Heat or Energy Recovery Ventilators Selection of Heat or Energy Recovery Ventilators
17	Energy and/or Mass Recovery Calculation Procedure Energy and/or Mass Recovery Calculation Procedure Fig. 18 Maximum Sensible and Latent Heat from Process A-B Fig. 18 Maximum Sensible and Latent Heat from Process A-B Fig. 18 Maximum Sensible and Latent Heat from Process A-B Fig. 18 Maximum Sensible and Latent Heat from Process A-B
18	Fig. 19 Sensible Heat Recovery in Winter (Example 2) Fig. 19 Sensible Heat Recovery in Winter (Example 2) Fig. 19 Sensible Heat Recovery in Winter (Example 4) Fig. 19 Sensible Heat Recovery in Winter (Example 4)
19	Fig. 20 Total Heat Recovery in Summer (Example 4) Fig. 20 Total Heat Recovery in Summer (Example 4) Fig. 20 Sensible Heat Recovery in Winter with Condensate (Example 5) Fig. 20 Sensible Heat Recovery in Winter with Condensate (Example 5)
20	Fig. 21 Total Heat Recovery in Summer (Example 4) Fig. 21 Total Heat Recovery in Summer (Example 4) Fig. 21 Total Heat Recovery in Summer (Example 6) Fig. 21 Total Heat Recovery in Summer (Example 6) Fig. 22 Total Heat Recovery in Summer (Example 4) Fig. 22 Total Heat Recovery in Summer (Example 4) Fig. 22 Total Energy Recovery with EATR ¹ 0 and OACF ¹ 1 (Example 7) Fig. 22 Total Energy Recovery with EATR ¹ 0 and OACF ¹ 1 (Example 7)
21	Fig. 23 Total Heat Recovery in Summer (Example 4) Fig. 23 Total Heat Recovery in Summer (Example 4) Fig. 23 Actual Airflow Rates at Various State Points (Example 7) Fig. 23 Actual Airflow Rates at Various State Points (Example 7) Indirect Evaporative Air Cooling Indirect Evaporative Air Cooling Fig. 24 Indirect Evaporative Cooling Recovery (Example 5) Fig. 24 Indirect Evaporative Cooling Recovery (Example 5) Fig. 24 Indirect Evaporative Cooling Recovery (Example 8) Fig. 24 Indirect Evaporative Cooling Recovery (Example 8)
22	Precooling Air Reheater (Series Application) Precooling Air Reheater (Series Application) Fig. 25 Precooling Air Reheater Fig. 25 Precooling Air Reheater Fig. 25 Precooling Air Reheater Fig. 25 Precooling Air Reheater Fig. 26 Precooling Air Reheater Dehumidifier (Example 6) Fig. 26 Precooling Air Reheater Dehumidifier (Example 6) Fig. 26 Precooling Air Reheater Dehumidifier (Example 9) Fig. 26 Precooling Air Reheater Dehumidifier (Example 9) Economic Considerations Economic Considerations
23	Symbols Symbols
24	References References Bibliography Bibliography

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Standard Title	HVAC Sytems and Equipment Handbook – Chapter 25. Air-to-Air Energy Recovery Equipment
Published Code	ASHRAE
Publication Date	2008
Pages Count	25

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2008 ASHRAE Handbook HVAC SytemsandEquipment Chapter25

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