Best Direction System Ltd. 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

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

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

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

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

Humidity Effect For Human Being

Appropriated Humidity For Various Application Humidity Control Concept

Process of the Air Humidity Control Concept Humidification Cooling Heating Dehumidification

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

No. Of occupancy & Activity Electrical power appliances 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

Heat Load Factor Solar Heat Gain Humidity Control Concept

Heat Load Factor Wall Transmission Humidity Control Concept

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

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

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

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

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

Compressor Discharge Gas Temp. Humidity Control Concept

Compressor Discharge Gas Temp. Humidity Control Concept

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

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

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

Completted Refrigerant Circuit Humidity Control Concept Refrigerant Diagram

Controls System Humidity Control Concept

Controls System Humidity Control Concept

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

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

VFD Retrofit Consideration Refrigerant Side Humidity Control Concept

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

Refrigerant piping sizing to improve capacity 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

Controls “POINT” Humidity Control Concept

Controls System Humidity Control Concept

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

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

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