Note that the Excel program uses SI units for the thermodynamic property values. water Heavy water (D2O) Heavywater-d2 Water-2H2. The program is compatible with all versions of Excel.Ĭlick on this link to see a screen capture of the Excel spreadsheet for the superheated region. To use the calculator you need to have Microsoft Excel installed on your computer. You need to uncompress this file before you can access the calculator. In the subcooled and superheated region, you can specify ( P, T), ( P, v), ( P, u), ( P, h), or ( P, s), and automatically solve for the remaining thermodynamic properties.Īll the files that come with this calculator are contained in a single (compressed) file, in the "zip" format. In the saturated region, you can specify any of the six thermodynamic properties and automatically solve for the remaining five. It calculates thermodynamic properties in the subcooled region for an absolute pressure range of 5-50 MPa, using 7 data tables spread apart over this range. The Excel spreadsheet calculates thermodynamic properties in the superheated region for an absolute pressure range of 0.01-80 MPa, using 30 data tables spread apart over this pressure range. The calculator uses data points from thermodynamic property tables, and uses linear interpolation to calculate the following six thermodynamic properties: Temperature ( T), pressure ( P), specific volume ( v), energy ( u), enthalpy ( h), and entropy ( s). This calculator is programmed in Microsoft Excel. You can also perform the dew point temperature calculation using the equation below.I created a steam table calculator which makes it easy to calculate the thermodynamic properties of water in the subcooled, saturated, and superheated region. It is the temperature at which saturation occurs for any other substance without any change in vapor pressure. The humidity of the air will be lower if the difference between the two temperatures is significant.ĭew point temperature definition: the temperature (T dp) above which the water vapor in the air condenses and turns into a liquid state. The difference between dry-bulb temperature and wet bulb temperature is the humidity of the air. Temperature and Pressure Absolute viscosity for water in centipoises for temperatures between 32 - 200 o F. Volumetric (Cubic) Thermal Expansion Volumetric temperature expansion calculator. Visit the wet bulb calculator to find out how to determine this temperature.ĭry bulb temperature definition: is the temperature (T db) measured by the thermometer at ambient pressure, i.e., the ambient temperature. To calculate the entropy change when an event occurs, the resulting entropy change of the systems surroundings must be added to. The entropy of a substance is zero if the absolute temperature is zero. The temperature shown by the thermometer is the wet-bulb temperature. Wondering how to calculate wet-bulb temperature? Take a wet wick and tie it around the bulb of the thermometer. We then multiply the entropy term by the absolute temperature and subtract this quantity from the enthalpy term: G o H o - T S o 28,050 J - (298.15 K x 108.7 J/K) 28,050 J - 32,410 J -4360 J. Wet bulb temperature definition: is the lowest temperature (T wb) to which air can be cooled by adding evaporating water into the air, considering constant pressure. The change in entropy that accompanies the conversion of liquid sulfur to S (S fus() S 3 in the cycle) cannot be measured directly. 3, in which liquid sulfur is an intermediate. The condition of moist air is defined by a set of pressure, temperature, and humidity parameters, that are: The transition from S to S can be described by the thermodynamic cycle shown in part (b) in Figure 18.3.3 18.3. The atmosphere is a mixture of dry air and water vapor, often known as moist air. The principles of psychrometry are the lynchpin in designing different industrial and residential applications such as ventilation in large buildings, mixing streams of air in air conditioning, industrial drying, and achieving human comfort using heating, cooling, or relative humidity. It is the science that covers the conditions of humid or moist air. Before we get into dry and wet bulb temperature, let's look into psychrometry.
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