Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Free online design tool for designing hot water heating systems - metric units.
This tool can be used to design hot water heating systems.
How to Use Make a sketch of the system - something similar to the default sketch below. Custom drawings can be linked to the application - any global (http://..) or local (file://..) url should work Tag the sections and add them to the hierarchical application structure below (after reset) Add input data - power, preliminary dimensions, lengths, minor coefficients, temperature drop, and so on for each section Modify the piping dimensions to achieve reasonable values for velocities and pressure drops Select pump - the pump pressure must be larger than the highest accumulated pressure loss in the system Balance the system - start with the endpoints - add balancing pressures until the pump pressures in the end points equals zero. Add balancing pressure in other sections if required. Save the data file to your computer/network dimensions, minor loss coefficients, viscosity, density, roughness, specific heat
Important! - this calculation is for the flow . If the flow and return piping systems are more or less identical - as in the default example above - the total pressure loss through the system for the pump to handle is OR the return piping system 2 times the calculated (as indicated in the graph).
If the flow and the return system are different - like with a reversed return system - then the flow and the return systems must be calculated separately. The total pressure loss for the pump to handle will be the
summarized pressure loss for the flow and return system. Note! - Since only half of the system is calculated - use only half the minor loss coefficients specified by suppliers in connection points between flow and return systems - typical in heating elements and/or in the central heater and pump. When selecting balancing valves - keep the flow but double the calculated balancing pressure drop for systems with identical flow and return piping - and summarize if the piping is different.
Related Topics Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more. Related Documents Internal and external diameters, areas, weights, volumes and number of threads for ANSI schedule 40 steel pipes. Internal and external diameters, areas, weights, volumes and number of threads for schedule 80 steel pipes. Pipe sizes, inside and outside diameters, wall thickness, schedules, moment of inertia, transverse area, weight of pipe filled with water - U.S. Customary Units. Pipe sizes, inside and outside diameters, wall thickness, schedules, weight and weight of pipe filled with water - Metric Units. Water and gas copper tubes according ASTM B88 - type K, L and M - imperial units. Dimensions of PEX tubes. Working pressures of metric sized copper tubes according the BS (British Standard) 2871. Hot water heat carrying capacities in copper tubes type L. Calculate gravity and forced circulating hot water heating systems. Water temperature and heating capacity. Design procedures for domestic hot water service systems. Dimensions and weights of steel tubes according BS EN 10255. Calculate minor pressure loss in piping systems with the Equivalent Pipe Length Method. Properties like freezing point, viscosity, specific gravity and specific heat of ethylene glycol based heat-transfer fluids, or brines. Minor pressure loss with fittings in piping heating systems. The density difference between hot and cold water is the circulating force in a self circulating gravity heating system. The heat emission from a radiator or a heating panel depends on the temperature difference between the radiator and the surrounding air. Calculate flow rates in heating systems. Safety valves with boilers ranging 275 to 1500 kW. Energy required to heat up a substance. Hot water can be circulated through a return pipe if it's instantly required at the fixtures. Required hot water expansion volume in open, closed and diaphragm tanks. Hot water heating system design procedure with heat loss, boiler rating, heater units and more. Hot water heating temperatures adapts to outdoor temperatures. Seasonal effects on hot-water heating systems flow temperatures. Online design tool for hot water heating systems. Pressure loss nomogram for hot water steel pipes. Equivalent length of fittings like bends, returns, tees and valves in hot water heating systems - equivalent length in feet and meter. Hot-water heating systems can be classified by temperature and pressure. The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - 'Diametre Nominal'. Nominal wall thickness of seamless and welded carbon and alloy steel pipes Recommended insulation thickness for heating systems like hot water and low, medium or high pressure steam systems. Temperature expansion coefficients for materials used in pipes and tubes like aluminum, carbon steel, cast iron, PVC, HDPE and more. Dimension of pressfit pipes. Freezing points of propylene glycol based heat-transfer fluids suitable for the food processing industry. Sizing snow melting systems - water and antifreeze. An introduction to the basic design of steam heating systems. Water velocities in pipes and tubes should not exceed certain limits.
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