Engineering & Knowledge - HVAC-R & Solar Engineering Resource

Design di ventilazione HVAC: distanza minima di separazione dell'aria

Air intake minimum separation distance represents critical design criteria for ensuring adequate outdoor air quality by maintaining appropriate distances between fresh air intakes and potential contamination sources.

Stima del carico HVAC: fattore di diversità

Diversity factor represents a critical design parameter in HVAC load calculations, accounting for the statistical probability that all heat-generating components in a building will not operate simultaneously

Stima del carico HVAC: guadagno e perdita di infiltrazione di calore

Infiltration represents uncontrolled air exchange between outdoor and indoor environments, significantly impacting both heating and cooling loads in all building types. Accurate infiltration estimation is essential for

Stima del carico HVAC: guadagno di calore interno da apparecchiature ed elettrodomestici

Equipment and appliances represent significant internal heat sources in modern buildings, often comprising the largest component of cooling loads in commercial and industrial facilities. Accurate estimation of

Stima del carico HVAC: guadagno di calore interno da persone e occupanti

Internal heat gain from people represents a significant component of HVAC cooling loads, particularly in high-occupancy buildings. Accurate estimation of occupant heat gain is essential for proper

Stima del carico HVAC: valori U-valori di vetro e coefficiente di ombreggiatura (SC)

Fenestration thermal and solar properties are critical parameters in HVAC load calculations, significantly impacting both heating and cooling loads. Understanding glazing U-values and shading coefficients is essential

Stima del carico HVAC: valori U di costruzione per pareti, tetti e partizioni

Building envelope thermal properties form the backbone of HVAC load calculations, directly determining heat transfer rates and system sizing requirements. Accurate U-value determination is essential for

Processi psicrometrici HVAC: grafici, calcoli e applicazioni di trattamento dell'aria

Psychrometric processes form the scientific foundation of HVAC system design, enabling engineers to analyze air conditions and design effective air treatment systems. Understanding these processes is essential

Equazioni di progettazione HVAC: calcoli di aria, ventola, pompa e sistema idronico

HVAC engineers rely on fundamental equations to design, size, and optimize mechanical systems. These mathematical relationships form the backbone of proper system design, ensuring accurate performance predictions

Linee guida Ashrae sull'aspettativa di vita delle attrezzature HVAC

Learn how to apply ASHRAE guidelines on HVAC equipment life expectancy to optimize your building’s maintenance schedules and replacement budgeting.

Calcolatore del duttulatore e della perdita di pressione (attrito).

Streamline your HVAC design process with our comprehensive digital Ductulator and Pressure Loss Calculator. This all-in-one tool allows you to instantly convert duct shapes, determine optimal sizing based on friction or velocity constraints, and accurately calculate total pressure loss and airflow rates for complex ductwork systems.

Calcolatore della miscelazione dell'aria

Accurately determine the final thermodynamic state of combined airstreams. Input flow rates and air properties to instantly calculate mixed air conditions, streamlining AHU fresh-air and return-air mixing design.

Calcolatore del deficit di pressione del vapore (VPD).

Optimize humidity control for HVAC, greenhouse cultivation, and agricultural drying. Use this Vapor Pressure Deficit (VPD) calculator to accurately determine moisture potential, enabling better transpiration rates, crop yield optimization, and precise environmental management.

Calcolatore dello stato psicrometrico

Instantly determine the complete psychrometric state of moist air using just two inputs. Enter dry-bulb temperature alongside any single humidity parameter to automatically calculate dew point, wet-bulb, relative humidity, enthalpy, specific volume, and density for precise HVAC design and analysis.

Calcolatore delle dimensioni del plenum

Free online plenum box size calculator for HVAC engineers. Enter airflow (CFM or m³/h) and target velocity to instantly get recommended width, height, length, and depth for supply and return plenum boxes, based on ACCA Manual D sizing practice.

Calcolatore per il dimensionamento del serbatoio di espansione

Size bladder, diaphragm, or plain-steel expansion tanks for closed hydronic systems in seconds. This calculator applies thermal-expansion and pressure-ratio principles from Steven T. Taylor’s ASHRAE-referenced sizing method and the ASME Boiler and Pressure Vessel Code, Section VI, to compute the minimum required tank acceptance volume for hot water, chilled water, and mixed-temperature systems. Supports US and SI units, all four major tank styles, an optional piping-expansion credit, and a built-in ASME/UMC/IMC cross-check for 170–230°F systems — with clear pass/warning/invalid status and next-step guidance for tank selection and precharge verification.

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