基礎とエンジニアリング
Pump Construction (Part1)
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.
膨張弁の選択
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.
水管と火管ボイラー
Water tube boilers and fire tube boilers are two different types of steam boilers that are commonly used in industrial and commercial applications. Both types of boilers use a system of tubes to generate steam, but they differ in the way that the tubes are arranged and the way that the hot gases from the burner pass through the 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.
冷蔵式と計算
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.
The coefficient of velocity (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.
パイプ断熱ガイドライン
パイプの断熱は、エネルギー効率、温度制御、結露制御、騒音低減、安全性を維持するために非常に重要です。 ASHRAE は、規格 90.1 でさまざまなパイプ サイズと温度範囲に応じた特定の推奨厚さを提供しています。 ASHRAE 規格に基づいてパイプ断熱材を選択する場合は、温度、パイプのサイズ、環境への配慮、耐火性、エネルギー効率を考慮することが重要です。
冷媒配管 – パート 2
In this post, we will be continuing our comprehensive training on how to size refrigerant piping. We will cover all the important aspects of this process, including determining the pipe size, pressure drop, and other factors. We will also discuss topics such as sizing refrigerant lines, equivalent length for refrigerant lines, and how to determine equivalent length. With this training, you will have the knowledge and confidence to size refrigerant piping accurately and correctly in any situation.
標準とコンプライアンス
HVAC ダクト設計: ダクト継手の摩擦損失
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.
HVACダクト設計：ダンパー、減衰器、コイル摩擦損失
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.
HVACダクト設計：ダクトラウンドから長方形の同等物
Complete guide to HVAC round-to-rectangular duct equivalency using ASHRAE standards covering conversion formulas, performance considerations, and system optimization for space-constrained installations.
HVACダクト設計：ダクト摩擦損失
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.
HVACダクト設計：ダクト圧力分類
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.
HVACダクト設計：商業用キッチンダクトサイジング
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.
HVACダクト設計：速度とノイズ基準（NC）によるダクトサイジング
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.
HVACダクト設計：等しい摩擦法によるダクトサイジング
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.
HVACダクト設計：ダクトサイジングSmacnaの推奨
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.
デジタルツールとリソース
Psychrometric Programming Functions
ibrary of psychrometric functions to calculate thermodynamic properties of air for Python, C, C#, Fortran, JavaScript and VBA/Excel
キャリアハップソフトウェア
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.
トレース 700 ソフトウェア
TRACE 700 を使用すると、建物の設計者は、エネルギー利用とライフサイクル コストに基づいて建物、システム、設備の設計を最適化できます。 TRACE 700 用の Trane ソフトウェアを使用すると、ユーザーが広範囲の変数を操作して特定の建物のプロファイルを作成できるため、事実上あらゆるチラー プラント構成のエネルギーと経済効果の分析が容易になります。
EVAP-COND 5.0 をダウンロード: HVAC エンジニア向けの究極の熱交換器シミュレーション ツール
新しい熱交換器を設計する場合でも、既存のシステムを最適化する場合でも、代替冷媒を研究する場合でも、EVAP-COND は情報に基づいた意思決定を行うために必要な詳細な分析機能を提供します。すべての HVAC エンジニアと研究者がこの強力なシミュレーション ツールを検討し、それが熱交換器設計へのアプローチをどのように変えることができるかを直接体験することをお勧めします。
Heat Transfer Textbook Download
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.