Fondamentaux et ingénierie
Construction de la pompe (Partie 1)
In 1689 the physicist Denis Papin invented the centrifugal pump and today this kind of pump is the most used around the world. The centrifugal pump is built on a simple principle: Liquid is led to the impeller hub and by means of the centrifugal force it is flung towards the periphery of the impellers. The construction is fairly inexpensive, robust and simple and its high speed makes it possible to connect the pump directly to an asynchronous motor.
Expansion Valves Selection
The expansion valve regulates the amount of compressed liquid refrigerant moving into the evaporator. It removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a gas in the evaporator. In order to properly select Expansion Valves one should pay attention to the items that we mention in this post.
Tube à eau contre les chaudières à tube d'incendie
Les chaudières à tubes d'eau et les chaudières à tubes de fumée sont deux types différents de chaudières à vapeur couramment utilisées dans les applications industrielles et commerciales. Les deux types de chaudières utilisent un système de tubes pour générer de la vapeur, mais elles diffèrent par la manière dont les tubes sont disposés et par la manière dont les gaz chauds du brûleur passent à travers les tubes.
Water Hammer (Part1)
Under unfavorable circumstances, damage due to water hammer may occur in pipelines measuring more than one hundred meters and conveying only several tenths of a liter per second. But even very short, unsupported pipelines in pumping stations can be damaged by resonant vibrations if they are not properly anchored. By contrast, the phenomenon is not very common in building services systems, e.g. in heating and drinking water supply pipelines, which typically are short in length and have a small cross-section.
Formules de réfrigération et calculs
These formulas are commonly used in the field of refrigeration and air conditioning to calculate various performance parameters of a refrigeration system such as compression work, compression power, coefficient of performance, net refrigeration effect, capacity, compressor displacement, heat of compression, volumetric efficiency, and compression ratio. These formulas are based on the thermodynamics principles and are generally used to evaluate the performance of the refrigeration system and to optimize its design.
Le coefficient de vitesse (CV)
Cv, or coefficient of velocity, is a measure of the flow capacity of a valve. It represents the number of gallons per minute (GPM) of water at 60°F that will flow through a valve with a one-inch opening at a pressure drop of one pound per square inch (PSI). Cv can be calculated using various formulas, such as the one based on water at 60F and one that takes into account the specific gravity of the fluid. Cv is a theoretical value and it may vary depending on the actual conditions of the valve. When selecting a valve for a specific application, it is important to consider the Cv in relation to the flow rate and pressure drop requirements of the system, as well as other factors such as ease of maintenance, cost, and safety.
Pipe Insulation Guideline
Pipe insulation is crucial for maintaining energy efficiency, temperature control, condensation control, noise reduction, and safety. ASHRAE provides specific thickness recommendations for different pipe sizes and temperature ranges in its standard 90.1. When selecting pipe insulation based on ASHRAE standards, it’s important to consider the temperature, pipe size, environmental considerations, fire resistance, and energy efficiency.
Tuyauterie de réfrigérant - partie 2
Dans cet article, nous poursuivrons notre formation complète sur la façon de dimensionner la tuyauterie de réfrigérant. Nous couvrirons tous les aspects importants de ce processus, y compris la détermination de la taille du tuyau, de la chute de pression et d'autres facteurs. Nous discuterons également de sujets tels que de dimensionnement des lignes de réfrigérant, une longueur équivalente pour les lignes de réfrigérant et comment déterminer la longueur équivalente. Avec cette formation, vous aurez les connaissances et la confiance nécessaires pour tailler les tuyaux de réfrigérant avec précision et correctement dans n'importe quelle situation.
Normes et conformité
Conception du conduit HVAC: Perte de friction des raccords de conduit
Complete guide to HVAC duct fittings friction loss using Carrier standards covering loss coefficients, pressure drop calculations, and system optimization for efficient air distribution design.
Conception du conduit HVAC: amortisseurs, atténuateurs et pertes de frottement des bobines
Complete guide to HVAC dampers, attenuators, and coils friction loss using SMACNA standards covering pressure drop calculations, component selection, and system optimization for efficient air distribution design.
Conception du conduit HVAC: conduit à l'équivalent rectangulaire
Complete guide to HVAC round-to-rectangular duct equivalency using ASHRAE standards covering conversion formulas, performance considerations, and system optimization for space-constrained installations.
Conception du conduit HVAC: perte de frottement du conduit
Complete guide to HVAC duct friction loss calculations using ASHRAE standards covering friction charts, pressure drop analysis, and system optimization for efficient air distribution design.
Conception du conduit HVAC: classification de la pression des conduits
Complete guide to HVAC duct pressure classification using SMACNA standards covering pressure class selection, construction requirements, and testing protocols for safe and efficient ductwork systems.
Conception du conduit CVC: dimensionnement commercial de conduits de cuisine
Complete guide to commercial kitchen duct sizing using ASHRAE and NFPA standards covering exhaust hood design, grease management, fire safety, and make-up air systems for food service operations.
Conception du conduit CVC: dimensionnement des conduits par des critères de vitesse et de bruit (NC)
Complete guide to HVAC duct sizing using velocity and noise criteria with ASHRAE and CIBSE standards covering acoustic design, velocity limits, and noise control for sensitive applications.
Conception du conduit HVAC: dimensionnement des conduits par méthode de frottement égale
Complete guide to HVAC duct sizing using the equal friction method with SMACNA and ASHRAE standards covering calculation procedures, friction rate selection, and system optimization for effective air distribution design.
Conception du conduit HVAC: recommandations de smacna de dimensionnement des conduits
Complete guide to HVAC duct sizing using SMACNA recommendations covering equal friction, velocity, and static regain methods with design calculations and system optimization for effective air distribution.
Outils et ressources numériques
Téléchargement du logiciel Cooltools
- Analyse du cycle (conception du processus) - Comparaison du cycle d'expansion directe d'une étape et du cycle inondé d'une étape. - Dimensionnement du système - Calcul des tailles de composants à partir des critères généraux. - Simulation du système - Calcul des conditions de fonctionnement dans un système avec des composants connus. Calculs des composants - Calcul des - Efficacité des composants et conditions de sortie. - Évaluation du fonctionnement - Évaluation de l'efficacité du système. - Investigation du processus - Par exemple, calculs de l'air humide.
Diagramme de pH réfrigérant (partie 2)
Cet article est une continuation de notre ancien article, qui a été bien reçu par les utilisateurs, nous avons donc décidé de mettre à jour la liste des diagrammes de pH et de vous fournir une liste plus complète des réfrigérants commerciaux du monde. Vous pouvez facilement accéder au tableau de réfrigérant de haute qualité en cliquant sur les réfrigérants répertoriés dans le tableau.
Télécharger Carrier Plv Pro
Carrier’s PLV Pro is a software tool that empowers consulting engineers to make objective and informed decisions about their chiller plant design that go beyond Full Load and IPLV metrics. Results are provided in a professional report or .csv format for further analysis. The tool is for professionals who need a quick and free-of-charge alternative to detailed energy modeling analyses.
Téléchargement
Coolselector®2 (from Danfoss company) helps to optimize energy consumption and increase efficiency in any HVACR system. Run unbiased calculations based on a set of operating conditions — such as cooling capacity, refrigerant, evaporation, and condensation temperature — and then select the best components for your design.
Calculatrice de condensat de climatisation
Air conditioning condensate is the water that is produced as a result of the cooling process in an air conditioning system. When the air conditioning system cools the air in a building, it removes moisture from the air, which condenses on the cool coils of the air conditioning system. This condensation is collected and drained away through a condensate drain pipe. The water that is collected in the condensate drain is typically referred to as air conditioning condensate.
Pipe Pressure Drop Calculations: Essential Equations and Guidelines
Explore the essentials of pipe pressure drop calculations, including key factors affecting pressure drop, commonly used equations, and practical tips for optimizing fluid transportation systems. Learn about software and tools that can assist in streamlining your calculations and enhance the efficiency of your projects. In this blog post, we discussed the importance of understanding pipe pressure drop calculations and their relevance across various industries. We introduced key factors affecting pressure drop, such as pipe diameter, length, flow rate, fluid properties, and pipe roughness. We also examined several equations for calculating pressure drop, including the Darcy-Weisbach, Hazen-Williams, and Colebrook-White equations, discussing their applicability and limitations.
Téléchargement McQuay Duct Sizer
The McQuay Duct Sizer is a specialized software tool designed for HVAC professionals to assist in the accurate and efficient sizing of air ducts. This tool is essential for ensuring optimal performance and energy efficiency in HVAC systems. The McQuay Duct Sizer is available for free download.
Calculs de dimensionnement du débit d'air d'espace et de zone dans les systèmes CVC
Following our previous discussion on the systematic 9-step procedure for designing cooling and heating systems, it’s essential to understand the technical aspects of airflow sizing
Télécharger HVAC-CX: l'outil de mise en service des systèmes HVAC de construction essentiel
Alors que les bâtiments continuent d'évoluer vers une efficacité plus élevée et des stratégies de contrôle plus sophistiquées, des outils comme HVAC-CX deviennent de plus en plus précieux. La capacité du logiciel à détecter systématiquement les défauts, à hiérarchiser les problèmes et à aider à la mise en service active représente une progression importante dans la technologie des opérations de construction.