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Humidity Control Concept

Humidity Control Concept. Hot Gas Reheat, Hot Gas Bypass, VSD & DDC Controls System For DX & CHW Coil By : Best Direction System Ltd. Humidity Control Concept. What is humidity ?. Absolute humidity (g/kg of dry air) Dry air 1.225 kg/m 3 Relative humidity (%RH).

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Humidity Control Concept

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  1. Humidity Control Concept Hot Gas Reheat, Hot Gas Bypass, VSD & DDC Controls System For DX & CHW Coil By : Best Direction System Ltd. Humidity Control Concept

  2. What is humidity ? • Absolute humidity • (g/kg of dry air) • Dry air 1.225 kg/m3 • Relative humidity • (%RH) Humidity Control Concept

  3. What is humidity ? Kg/kg of dry air oC 40 150 125 30 Humidity Control Concept 100 Latent Heat Factor Humidity Ratio 20 Temperature WB 50 10 0 25 0 10 20 30 40 oC Temperature DB Sensible Heat Factor

  4. Relative Humidity 40 30 Humidity Control Concept 100%RH Latent Heat Factor Humidity Ratio 75%RH 20 50%RH Temperature WB 10 0 0 10 20 30 40 oC Temperature DB Sensible Heat Factor

  5. Psychrometric Chart 100%RH Vap Pressure 3.169 kPa 25oC 60%RH DP 16.7oC 50%RH DP 13.9oC 25oC 50%RH 25%RH

  6. Humidity Effect For Human Being

  7. Appropriated Humidity For Various Application Humidity Control Concept

  8. Process of the Air Humidity Control Concept Humidification Cooling Heating Dehumidification

  9. Temperature & Humidity Controls Function CONTROLS FUNCTION • COOLING MODE • HEATING MODE • DEHUMIDIFYING MODE • HUMIDIFYING MODE Humidity Control Concept

  10. Heat Load Factor • Solar Heat Gain • Wall transmission • Temp. Diff. • No. Of occupancy & Activity • Activity • Internal heat source • Electrical power appliances • Infiltration • ETC. Humidity Control Concept

  11. Heat Load Factor Solar Heat Gain Humidity Control Concept

  12. Heat Load Factor Wall Transmission Humidity Control Concept

  13. Heat Load Factor Occupacy Heat Load Humidity Control Concept 1,000 BTU

  14. Heat Load Profile Selected A/C @maximum range Humidity Control Concept Heat Load (Tons) Hour of Day

  15. Heat Load Profile (Winter) Cooling Humidity Control Concept Heat Load (Tons) Heating Hour of Day

  16. System Cooling Load • Sensible Heat (Hs) • Latent Heat (HL) Humidity Control Concept

  17. Hot Gas Reheat Coil Humidity Control Concept Hot Gas Reheat Coil Energy Saving>30% SYSTEM DESIGN

  18. Compressor Discharge Gas Temp. Humidity Control Concept

  19. Compressor Discharge Gas Temp. Humidity Control Concept

  20. Hot Gas Reheat Coil Humidity Control Concept Energy Saving >30-40%

  21. Annual Energy Cost Heater HGR Hot Gas Reheat Coil Saving Criteria Humidity Control Concept

  22. Hot Gas Bypass System Humidity Control Concept Hot Gas Bypass System (HGBP) Prevents often of compressor cycling on/off and maintains a very constant of humidity control level.

  23. Completted Refrigerant Circuit Humidity Control Concept Refrigerant Diagram

  24. Controls System Humidity Control Concept

  25. Controls System Humidity Control Concept

  26. Advanced Controls System Advanced cooling capacity management with compressor & fan variable speed control drive lets us manage widely range of system partial heat load 40%-100% without recycling of compressor. Humidity Control Concept

  27. Reheat Application For Chilled Water System Hospital Laboratory Concept Saving by Nothing to Invest.

  28. VFD Retrofit Consideration Refrigerant Side Humidity Control Concept

  29. VFD Retrofit Consideration Hermetic/Semi-hermetic reciprocating compressors Refrigerant Side Humidity Control Concept Recommended Frequency Range 30-60 Hz

  30. VFD Retrofit Consideration Refrigerant Side • Refrigerant piping sizing to improve capacity • at minimum and maximum speed. • High suction superheat gas <25oC. • Compressor oil reclaim system. • Refrigerant flood back to compressor. • Maximum and minimum capability of each • compressor type Humidity Control Concept

  31. Controls “POINT” Humidity Control Concept

  32. Controls System Humidity Control Concept

  33. Controls System Humidity Control Concept Controls Network Diagram (Option)

  34. Room Temp. & Humidity Controls Conventional Air Conditioner Biosafety Laboratory Concept Humidity Control Concept

  35. Room Temp. & Humidity Controls Air Conditioner with Humidity Control System Biosafety Laboratory Concept Humidity Control Concept

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