Air Conditioning
Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort
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ASTM B 280 Copper Tube - ACR
Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service - ACR
Air Conditioner Efficiency
Air conditioner efficiency express the ratio between heat removed to watt of power used - EER and SEER
Air Conditioning - Cooling and Condensate Generated
Water condensate in air conditioning systems
Ammonia - NH3 - Concentration in Air and Health Symptoms
Ammonia and health symptoms - smell and threat to life
Ammonia - NH3 - Properties
Thermodynamic properties - specific volume, enthalpy and entropy - of saturated and superheated ammonia
Calculating Cooling Loads
Calculating chiller and cooling tower refrigeration in tons
Chilled-Water System
Chilled-water systems formulas - evaporator and condenser flow rates
Comparing Ethylene Glycol and Propylene Glycol
Comparing the properties of ethylene glycol and propylene glycol
Converting kW/ton to COP or EER
How to convert between kW/ton, COP and EER
Cooling Loads - Latent and Sensible Heat
Latent and sensible cooling loads to consider in design of HVAC systems
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Cooling and Heating - Performance and Efficiency Terminology
Performance and efficiency terminology related to heat pumps and air condition systems
Cooling and Heating Equations
Latent and sensible cooling and heating equations - in imperial units
Dehumidfication in Psychrometric Charts
A dehumidification tutorial with psychrometric charts
Dehumidifiers
Classification of dehumidifiers
Ethylene Glycol Heat-Transfer Fluid
Freezing point, viscosity, specific gravity and specific heat capacity of ethylene glycol based heat-transfer fluids, or brines
Freeze Protection Closed Loop Systems
Antifreeze is used to freeze protect water based heat transfer fluids or brines
Freon - Dichlorodifluoromethane - CF2Cl2 - Properties
Thermodynamic properties - specific volume, enthalpy and entropy - of saturated and superheated Freon - Dichlorodifluoromethane - CF2Cl2
Fruits and Vegetables - Optimal Storage Conditions
Optimal temperature and humidity conditions for some common fruits and vegetables
HVAC Diagram - online drawing
Online HVAC diagram drawing
Heat Emission of Animals
Heat emission from animals
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Heat Gain from Electrical Motors in Continuous Operation
Heat transferred from electrical motors to rooms with different locations of fan and motor
Heat Gain from Lights
Heat contribution from lights may have major impacts on air condition systems
Heat Index
Equivalent heat index temperatures at various temperatures and corresponding relative humidity - in degrees Fahrenheit and Celsius
Heat Pumps Performance and Efficiency Ratings
Rating performance and efficiency of heat pumps
Humidifying Air with Steam - SI units
The amount of vapor - kg per cubic meter - in humid air
Indoor Design Conditions - Industrial Products and Production Processes
Recommended indoor temperature and humidity for some common industrial products and production processes
Inside Design Conditions - Summer and Winter
Recommended indoor design conditions
Lights - Installed Power
Installed light power in some common types of buildings and rooms
Measuring Air Humidity
Measuring relative air humidity with dry and wet bulb temperatures
Outdoor Temperature and Relative Humidity - US Winter and Summer Conditions
Outdoor design temperature and relative humidity in US states and cities - summer and winter
People and Heat Gain
Heat Gain from Occupants in Air Conditioned Spaces - in btu/hr
Persons and Metabolic Heat Gain
Metabolic heat gain from occupants in air conditioned spaces at different degrees of activities - in Watts
Pressure and Temperature Chart of Ammonia - NH3
A temperature (oF) and pressure (psia, psig) chart for Ammonia - NH3
Radiant Heat through Windows
Solar heat gain with roller shades, vertical blinds and Venetian blinds
Recommended Indoor Temperature versus Outdoor Temperature
Recommended indoor effective temperatures at various outdoor dry-bulb temperatures
Recommended Indoor Temperature versus Outdoor Temperature
Recommended indoor effective temperatures at various outdoor dry-bulb temperatures
Recommended Relative Humidity in Production and Process Environments
Recommended Relative Humidity - RH - in production and process environments like libraries, breweries, storages and more
Rectangular and Circular HVAC Ducts - Equivalent Diameter
Equivalent diameters for rectangular and circular ducts - air flows between 100 - 50,000 cfm
Refrigerant R22 - Properties
Properties of Refrigerant R22 - saturated liquid and saturated vapor - both imperial and metric units
Refrigerants
Common refrigerants - methane series, ethane series, propane series, cyclic organic compounds, zeotropic blends, azeotropic blends and organic compounds
Refrigerants - Environment Properties
Refrigerants - Ozone Depletion (ODP) and Global Warming Potential (GWP)
Refrigerants - Environmental Properties
Physical and environmental properties
Sensible Heat Ratio - SHR
Sensible Heat Ratio - SHR - is defined as the sensible heat or cooling load divided by the total heat or cooling load
Space required for Ventilation and Air Conditioning Equipment
Required size of ventilation and air conditioning rooms according DIN 1946
Temperature-Pressure Diagram for Constant Boiling Refrigerants
Temperature-pressure in imperial and SI units
Thermodynamic Properties of Refrigerant - R22
Properties of R22 - vapor volume, enthalpy and entropy at pressures from 30 to 260 psia
Type of Glass and Solar Heat Transmission
Relative heat transmission through glass windows
Water Evaporator and Condenser Equations
Air condition load, evaporator and condenser water flow rate
