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
Fonctions de programmation psychrométrique
ibrary of psychrometric functions to calculate thermodynamic properties of air for Python, C, C#, Fortran, JavaScript and VBA/Excel
Logiciel Carrier Hap
Carrier’s Hourly Analysis Program is two powerful tools in one package – versatile features for designing HVAC systems for commercial buildings AND powerful energy analysis capabilities for comparing energy consumption and operating costs of design alternatives.
Trace 700 Software
TRACE 700 enables building designers to optimize the building, system and equipment designs on the basis of energy utilization and life-cycle cost. The Trane software for TRACE 700 facilitates analysis of the energy and economic effects of virtually any chiller plant configuration by allowing users to manipulate a wide range of variables and create a profile of their specific building.
Télécharger Evap-Cond 5.0: L'outil de simulation de l'échangeur de chaleur ultime pour les ingénieurs HVAC
Que vous conceviez un nouvel échangeur de chaleur, l'optimisation d'un système existant ou que vous recherchiez des réfrigérants alternatifs, EVAP-Cond fournit les capacités d'analyse détaillées nécessaires pour prendre des décisions éclairées. J'encourage tous les ingénieurs et chercheurs CVC à explorer cet outil de simulation puissant et à découvrir de première main comment transformer votre approche en conception de l'échangeur de chaleur.
Téléchargement du manuel de transfert de chaleur
The book is meant for juniors, seniors, and first-year graduate students. And to those who choose to learn the subject on their own, and to practicing engineers who use it as a reference. Whether one studies alone or with a class, learning means posing, then answering, one’s own questions.