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Indoor Design Humidity

Reference data and engineering information about indoor design humidity for air psychrometrics applications.

indoordesignhumidity

Overview

Engineering reference data for Indoor Design Humidity in air psychrometrics.

Key Formulas

Humidity Ratio

ω=0.622PvPa\omega = 0.622 \frac{P_v}{P_a}

Mass of water vapor per mass of dry air.

Relative Humidity

ϕ=PvPvs×100%\phi = \frac{P_v}{P_{vs}} \times 100\%

Ratio of actual to saturation vapor pressure.

Wet Bulb Temperature

Twb=TdbPvsPvγT_{wb} = T_{db} - \frac{P_{vs} - P_v}{\gamma}

Temperature measured by wet-bulb thermometer.

Enthalpy of Moist Air

h=cpT+ωhgh = c_p T + \omega h_g

Sensible + latent heat per unit mass of dry air.

Variables

SymbolDescriptionUnit
ω\omegaHumidity ratiokg/kg
ϕ\phiRelative humidity%
PvP_vVapor pressurePa
PvsP_{vs}Saturation vapor pressurePa
TdbT_{db}Dry bulb temperature°C
TwbT_{wb}Wet bulb temperature°C

Data Table

163 rows
Industry / Process / Temperature / Relative humidity data
col0
oC
min
Abrasives
Ammunition
Bakery
Production
Billiard Room
Bowling Center
Billiard rooms
Bread
Fermentation
Retarding of Dough
Final Proof
Counter flow Cooling
Brewing
Yeast culture room
Candy
Enrobed room
Chocolate Cooling Tunnel supply air
Hand Dippers
Molded goods cooling
Chocolate Packing room
Chocolate finished stock storage
Centers tempering room
Marshmallow setting room
Grained marshmallows drying
Gum drying
Sanded Gum drying
Gum finished stock storage
Sugar pan supply air
Polishing pan supply air
Pan rooms
Nonpareil Pan supply air
Hard candy cooling tunnel air
Hard candy packing
Hard candy storage
Caramel rooms
Ceramics
Molding room
Clay storage
Decalcomania production
Decoration room
Cereal
Cheese Curing
Swiss
Blue
Brick
Limburger
Camembert
Clean rooms
Distilling
General Manufacturing
Aging
Fruit Storage
Apricots
Grapefruits (California)
Grapefruits (Florida)
Grapes (Eastern)
Grapes (Western)
Lemons
Oranges (California)
Oranges (Florida)
Peaches & Nectarines
Plums
Citrus fruits
Fur
Drying
Gum
Rolling
Stripping
Breaking
Wrapping
Hospitals
Patient rooms
Intensive care unit
Administrative & service areas
Leather
Storage, winter room temperature
Lenses (optical)
Grinding
Libraries & Museums
Rare manuscript & Storage Vaults
Art Storage Areas
Matches
Drying
Storage
Meat & fish
Beef (frozen)
Fish (fresh)
Fish (Frozen)
Lamb & Pork (Fresh)
Lamb & Pork (Frozen)
Mushrooms
Spawn added
Growing period
Storage
Paint Applications
Drying oil paints
Brush & spray painting
Pharmaceuticals
Milling room
Tablet compressing & coating
Effervescent tablets & powders
Hypodermic tablets
Colloids
Caught drops
Glandular products
Ampoule manufacturing
Gelatin Capsules
Capsule storage
Micro-analysis
Biological manufacturing
Liver extracts
Serums
Animal rooms
Small animal rooms
Paper
Storage of paper
Storage of books
Plastics
Cellophane wrapping
Photographic
Drying
Printing
Cutting
Plywood
Cold pressing
Printing
Folding
Pressing, general
Plate making
Lithographic press room
Letterpress & web offset rooms
Paper storage, letterpress
Paper storage, multicolor sheet feed lithography
Raw Material Storage
Nuts, rancidity
Eggs
Chocolate, flats
Butter
Dates, figs
Corn Syrup
Liquid sugar
Rubber-dipped goods
Dipping surgical articles
Storage prior to manufacture
Laboratory, ASTM standard
Textile
Cotton, spinning
Cotton, weaving
Nylon, production
Rayon, spinning
Rayon, twisting
Silk, spinning
Silk, weaving
Wool, carding
Wool, spinning
Wool, weaving
Tobacco
Softening
Stemming & strigging
Filler tobacco casing conditioning
Filler tobacco storage & preparation

Source: engineeringtoolbox.com

References