基礎とエンジニアリング
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.
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.
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.
パイプ圧力降下計算：必須式とガイドライン
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.
標準とコンプライアンス
HVAC Duct Design: Duct Fittings Friction Loss
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
一般的なパイプ材料の熱膨張速度
インタラクティブ計算機を使用して、一般的なパイプ材料の熱膨張速度を簡単に計算します。正確なデータ、設計洞察、および金属およびプラスチックの実用的なテーブルを取得します。これは、システムの信頼性とエネルギー効率に焦点を当てたHVACエンジニア、デザイナー、コンサルタントにとって重要です。
HVAC機器寿命計算機
プロのHVAC機器の寿命計算機を作成しました。このアプリケーションは、さまざまなHVAC機器タイプの残りの耐用年数を決定するための包括的な計算を提供します。
最新のHVACアプリケーション向けのBIMソフトウェアソリューション
HVAC業界が2025年に進化し続けるにつれて、Building Information Modeling（BIM）は、設計、設置、およびメンテナンスプロセスを最適化しようとする専門家にとって不可欠なツールになりました。 HVACエンジニア、請負業者、および技術者の場合、適切なBIMソフトウェアを選択すると、プロジェクトの効率と結果に大きな影響を与える可能性があります。 HVACアプリケーションに最も効果的なBIMソリューションを調べてみましょう。
McQuayソフトウェアのダウンロード
McQuay（Daikin Industriesの一部として）は、HVAC/R業界で最大の空調、暖房、換気、冷蔵会社の1つです。したがって、この会社がダウンロードできる経験と知識に基づいて業界に紹介したソフトウェアを作成することにしました。
ベル＆ゴセットセレクションソフトウェア
#xylem bell＆gosset #selection、#sizing＆#cadツール、#softwares
ダイキン Revit ファイル
DAIKIN APPLIED RESOURCE LIBRARY – REVIT FILES Rooftop Systems Air Handlers – Outdoor Air Cooled Chillers Water Cooled Chillers Fan Coils Self-Contained Water Source Heat Pump Unit Ventilators
Cooltools ソフトウェアのダウンロード
- サイクル分析（プロセス設計） - 1つの段階の直接拡張サイクルと1つのステージの浸水サイクルの比較。 - システムサイジング - 一般的な基準からのコンポーネントサイズの計算。 - システムシミュレーション - 既知のコンポーネントを持つシステムの動作条件の計算。コンポーネントの計算 - 計算 - コンポーネントの効率と出口条件。 - 動作の評価 - システム効率の評価。 - プロセス調査 - 湿った空気計算など。