35°F. 40°F. 45°F. 50°F. 55°F. 60°F. 65°F. 70°F. 75°F. 80°F. 85°F. 90°F. 95°F. °F. °F. °F. °F. °F. DRY BULB. TEMPERATURE AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR- CONDITIONING ENGINEERS, INC. T. SENSIBLE HEAT. BAROMETRIC PRESSURE: in. HG. PSYCHROMETRIC. CHART. Normal Temperature. I-P Units. SEA LEVEL.
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0. 5. DRY BULB TEMPERATURE - °C. 5. DRY BULB TEMPERATURE - °F. . PSYCHROMETRIC CHART. ▫ Identify parts of the chart. ▫ Determine moist air properties. ▫ Use chart to analyze processes involving moist air.
Essentially constant enthalpy 7. Sensible heating In HVAC systems, air is typically heated by passing it over a heating coil or use of electrical strip heaters. A schematic of a cooling coil is shown below. Refrigeration and Air Conditioning. Related titles. Edit Related wikiHows. Thanks for letting us know.
Also Available: Load Calculation Applications Manual, 2nd ed. This second edition, available in both I-P and SI units, provides clear understanding of the state of the art in heating and cooling load calculation methods.
Home Technical Resources Bookstore. Share This. Display a fully customizable psychrometric chart in both landscape and portrait modes. As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update.
In addition, you can double-tap a point to display the point properties and then edit them. Create psychrometric processes by plotting points then connecting them with process lines. Also, create custom labels anywhere on the chart. Email a list of all the points and their properties for a completed chart, along with a PDF of the chart itself. In HVAC systems, air is typically cooled by passing it over a cooling coil.
Most cooling coils are finned-tube heat exchangers in which cool water or refrigerant flows through tubes, and the tubes have external fins to increase heat transfer area. If the air is cooled below the dew point temperature, water will condense and must be drained from the bottom of the cooling coil. Sensible heating In HVAC systems, air is typically heated by passing it over a heating coil or use of electrical strip heaters. A schematic of a cooling coil is shown below.
Humidification adds moisture to the air which increase the absolute humidity 2. Water is added in vapor form 3. Water is converted from liquid to gas 4. Cooling with dehumidification Observable characteristics of a cooling and dehumidifying process are: Cooling with Adiabatic humidification Water injection Evaporative cooling is an adiabatic process, that is, there is no net heat loss or gain.
Constant wet bulb temperature 2. Decreasing dry bulb temperature 3. Increasing humidity ratio 4.
Increasing dew point temperature 5. Increasing vapor pressure 6. Essentially constant enthalpy 7.
Decreasing specific volume 8. There is no loss or gain of heat within the system because the amount of sensible heat removed equals latent heat added to the water. As this occurs, the heat of condensation will enter the air stream, thereby increasing its temperature.
The process is essentially adiabatic or isenthalpic. Examples; silica gel, activated alumina. Observable characteristics of a heating and dehumidification process are: Indicate all the values determined on the chart. Solved Problem 2: Assume that the outside air temperature is 8C. The air in contact with the windows will become colder until the dew point is reached.
Solved Problem 3: This defines the "comfort zone" which is portrayed on the Psychrometric Chart as shown below. Thus with the aid of the chart we either heat or cool, add moisture or dehumidify as required in order to bring the air into the comfort zone. Solved Problem 4: Using the Psychrometric Chart neatly plot the required air conditioning process and estimate a the amount of moisture removed [ Solved Problem 5: Water is added as the air passes through a series of wicks and the mixture exits at 27C.
Heating Determine the load kW required to raise 0. What would be the final condition of air? Cooling with adiabatic humidifier.
Heating with dehumidifier adiabatic process. Flag for inappropriate content. Related titles. Refrigeration and Air Conditioning. Stoecker, J.
Chemical Calculations for Chemical Engineering. Jump to Page. Search inside document. Humidity of air can be determined by measuring the adiabatic saturation temperature of air, which is the temperature air attains after flowing over water in a long adiabatic channel until it is saturated C P T2 T1 2 h f g hg1 h f 2 0.
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