slide1
Download
Skip this Video
Download Presentation
Humidity Control Concept

Loading in 2 Seconds...

play fullscreen
1 / 35

Humidity Control Concept - PowerPoint PPT Presentation


  • 101 Views
  • Uploaded on

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).

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Humidity Control Concept' - pia


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1
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

slide2
What is humidity ?
  • Absolute humidity
  • (g/kg of dry air)
  • Dry air 1.225 kg/m3
  • Relative humidity
  • (%RH)

Humidity Control Concept

slide3
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

slide4
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

slide5
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

slide7
Appropriated Humidity

For Various Application

Humidity Control Concept

slide8
Process of the Air

Humidity Control Concept

Humidification

Cooling

Heating

Dehumidification

slide9
Temperature & Humidity Controls Function

CONTROLS FUNCTION

  • COOLING MODE
  • HEATING MODE
  • DEHUMIDIFYING MODE
  • HUMIDIFYING MODE

Humidity Control Concept

slide10
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

slide11
Heat Load Factor

Solar Heat Gain

Humidity Control Concept

slide12
Heat Load Factor

Wall Transmission

Humidity Control Concept

slide13
Heat Load Factor

Occupacy Heat Load

Humidity Control Concept

1,000 BTU

slide14
Heat Load Profile

Selected A/C

@maximum range

Humidity Control Concept

Heat Load (Tons)

Hour of Day

slide15
Heat Load Profile (Winter)

Cooling

Humidity Control Concept

Heat Load (Tons)

Heating

Hour of Day

slide16
System Cooling Load
  • Sensible Heat (Hs)
  • Latent Heat (HL)

Humidity Control Concept

slide17
Hot Gas Reheat Coil

Humidity Control Concept

Hot Gas Reheat Coil

Energy Saving>30%

SYSTEM DESIGN

slide18
Compressor Discharge Gas Temp.

Humidity Control Concept

slide19
Compressor Discharge Gas Temp.

Humidity Control Concept

slide20
Hot Gas Reheat Coil

Humidity Control Concept

Energy

Saving

>30-40%

slide21
Annual Energy Cost

Heater

HGR

Hot Gas Reheat Coil Saving Criteria

Humidity Control Concept

slide22
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.

slide23
Completted Refrigerant Circuit

Humidity Control Concept

Refrigerant Diagram

slide24
Controls System

Humidity Control Concept

slide25
Controls System

Humidity Control Concept

slide26
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

slide27
Reheat Application For Chilled Water System

Hospital Laboratory Concept

Saving by Nothing to Invest.

slide28
VFD Retrofit Consideration

Refrigerant Side

Humidity Control Concept

slide29
VFD Retrofit Consideration

Hermetic/Semi-hermetic reciprocating compressors

Refrigerant Side

Humidity Control Concept

Recommended Frequency Range 30-60 Hz

slide30
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

slide31
Controls “POINT”

Humidity Control Concept

slide32
Controls System

Humidity Control Concept

slide33
Controls System

Humidity Control Concept

Controls Network Diagram (Option)

slide34
Room Temp. & Humidity Controls

Conventional Air Conditioner

Biosafety Laboratory Concept

Humidity Control Concept

slide35
Room Temp. & Humidity Controls

Air Conditioner with Humidity Control System

Biosafety Laboratory Concept

Humidity Control Concept

ad