Steam Pad vs Mechanical Engineering Toolkit

1. Introduction Steam Pad calculates the thermodynamic and transport properties of water and steam, using the latest releases of IAPWS. It has some distinctive features, and is applicable for industrial, engineering, and teaching processes: − Uses any selected 2 basic parameters to calculate others. − Provides T-S, H-S, P-H, T-H charts, and locates results (point locations) on them. − Computes additional thermodynamic and transport parameters. − Allows saving the results, and supports restoring one of them. 2. Calculator 2.1 Inputs and outputs By given any selected 2 parameters as the inputs from the Basics (Pressure, Temperature, Enthalpy, Entropy, Specific volume, Vapour Fraction), this App calculates other 4 parameters, and calculates some other thermodynamic and transport parameters. The inputs and outputs of the basics can alternate, which fulfills alterable calculating demands. 2.2 The range of validity The range of validity defined by pressure and temperature for general properties is the same to the definition in the release of IAPWS IF97. 2.3 Single-Phase regions and Two-Phase region The calculating demands are handled coordinately both for the Single-Phase regions and the Two-Phase region. The calculated properties and the corresponding region of the results can be distinguished from inputs automatically, and will be displayed in the outputs list box. For example, the saturation properties can be derived from the given P (less than 22.06395Mpa) and X (0.0-1.0). 2.4 Other properties The optional parameters are calculated based on the releases of IAPWS, or on the physical models, which include: − u: Specific internal energy − Specific isobaric heat capacity − Specific isochoric heat capacity − Speed of sound − Dynamic viscosity − Kinematic viscosity − Thermal conductivity − Entropy index − Static Dielectric Constant − Prandtl number 2.5 Units The parameters are shown in SI(metric) or in I-P(English) system of units, which can be reset in the Outputs Setting function of the app. 3. Charts 3.1 Chart types Typical thermodynamic charts are embedded in this app, and displayed as vector-graphs. Only regions 1 to 4 are shown in the charts, and region 5 is ignored for the applicative concern. The gradual changes (the lines) of the other 4 parameters along with the X and Y ordinates, are shown in the charts. There are 4 charts available: − T-S Chart − H-S Chart − P-H Chart − T-H Chart 3.2 Charts display − The lines of other 4 parameters are displayed in different colors. − Lines are displayed or hidden by checking the checkboxes. − The charts can be moved, enlarged or contracted by dragging or pinching gestures of fingers. − The corresponding values are attached along with the lines at certain intervals. − The boundary of the saturation region, and the critical point, are especially identified. 3.3 Calculated results The calculated results will be located in the charts as an identifying point (or points) with the corresponding ordinates. 4. Results The calculated records, each of which contains 6 basic parameters, can be stored in a row in the list of the Results panel by clicking the Save button on the Calculator panel. − The 2 inputs of one record are displayed in a distinctive color. − The region of each result, as well as the possible arrangement number of multiple outputs, is shown on the top of the row. − The records can be re-arranged and be deleted. − The selected record can be restored both on the Calculator panel and on the Charts panel, by clicking the Restore button.

Mechanical Engineering Toolkit is a professional engineering calculator for students, researchers, and practicing engineers. Choose a formula, enter your variables, and get instant results — with calculation steps, formulas, diagrams, and unit conversions shown along the way. Switch between SI and Imperial units anytime, save favorites, and find the right tool fast with recommendations by major. Save your inputs as named projects, and export any result as text, image, CSV or PDF. Categories and tools: Mechanics of Material • Moments of inertia of plane areas • Force-displacement relation of a bar • Torsion formula and angle of twist • Flexure formula of a beam • Transverse shear stress • Deflections and slopes of cantilever and simple beams • Plane stress transformation and Mohr's circle • Principal stresses and planes • Spherical shell and thin-walled pressure vessel stresses • Buckling load of a column • Thermal deformation and stress • Combined loading • Bolted / riveted joints • Fatigue safety factor • Shaft power and torque Statics • Centroid of an area • Resultant of a force system • Beam reactions • 2D truss analysis Machine Design • Helical compression springs • Spur gear geometry and stresses • Shaft fatigue design (DE-Goodman) • Bearing L10 life • Belt and chain drives • Bolt preload / torque-tension • Fillet weld strength • Press / shrink-fit interference • Shaft critical speed (Dunkerley) • Beam natural frequency (five end conditions) • Torsional natural frequency (one or two rotors) Fluids & Thermal • Reynolds number and flow regime • Pipe pressure drop (Darcy-Weisbach with Colebrook) • Pump and fan power • Composite wall conduction • Fin efficiency • Heat exchanger sizing by LMTD Theory of Elasticity • Constitutive relation of linear elastic material • Stress/strain of linear elastic material Composite Material • Lamina and laminate stress/strain • Lamina engineering constants • Laminate plane and 3D properties • Rule of mixtures • Failure criteria (Tsai-Hill, Tsai-Wu) Reference Tables • Drill & tap chart (metric and imperial thread series) • ISO 286 fits & tolerances • Standard sections (AISC W, IPE, HEB) • Unit converter No account required. Works offline. Available in English, Chinese, German, French, and Japanese.