基础与工程
Design Procedures for Heating-Only Systems: An 8-Step Methodology
Designing effective heating-only HVAC systems requires a methodical approach that ensures adequate capacity while avoiding oversizing. The following 8-step procedure provides a comprehensive framework for designing these systems, focusing on peak heating loads to determine appropriate equipment sizing.
Space and Zone Airflow Sizing Calculations in HVAC Systems
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
Design Procedures for Cooling-Only Systems: Detailed Airflow Calculation Methodology
this technical supplement provides detailed insights into the critical airflow calculation methods essential for Step 3: Calculate Required Zone and Space Supply Airflow Rates. Understanding these calculation approaches enables engineers to select the most appropriate sizing method for specific project requirements.
Design Procedures for Heating-Only Systems: Airflow Calculation Methods and Technical Considerations
Proper airflow calculations are essential for system performance, ensuring thermal comfort while optimizing energy efficiency. Understanding the mathematical foundation behind these calculations enables engineers to make informed decisions when selecting the most appropriate sizing method for specific project requirements.
制冷膨胀阀尺寸和选择过程
The proper selection and sizing of refrigeration expansion valves is a systematic process requiring careful consideration of multiple parameters. Selecting the right expansion valve involves understanding system requirements, calculating correct capacities, and accounting for operating conditions such as subcooling and pressure drop.
Refrigeration Evaporator Sizing and Selection
Evaporator sizing and selection represent critical elements in refrigeration system design. The process requires a methodical approach that considers not only the cooling load but also system integration, refrigerant properties, application requirements, and energy efficiency goals.
Lighting Rules Of Thumb (HVAC)
Using lighting rules of thumb for final design of HVAC and lighting.
Infiltration Rules Of Thumb
The infiltration rate is the volumetric flow rate of outside air into a building, typically in cubic feet per minute (CFM) or liters per second (LPS). The air exchange rate, (I), is the number of interior volume air changes that occur per hour, and has units of 1/h.
The Geometry Behind Solar Energy Calculations
Solar Geometric Angles are all critical to the calculation of solar energy on any given surface at some orientation. To calculate the energy balance across any time scale with respect to the incident solar radiation, you must know the geometric relationships that define the spherical realities of planetary motion relative to the sun for specific tilted surfaces on the planet.
标准与合规性
HVAC 管道设计：管道配件摩擦损失
使用开利标准的 HVAC 管道配件摩擦损失完整指南，涵盖损失系数、压降计算和高效空气分配设计的系统优化。
HVAC 管道设计：阻尼器、衰减器和线圈摩擦损失
使用 SMACNA 标准的 HVAC 阻尼器、衰减器和线圈摩擦损失完整指南，涵盖压降计算、组件选择和系统优化，以实现高效的空气分配设计。
HVAC 管道设计：圆形管道与矩形管道等效
使用 ASHRAE 标准的 HVAC 圆形管道与矩形管道等效的完整指南，涵盖转换公式、性能注意事项以及空间受限安装的系统优化。
HVAC 管道设计：管道摩擦损失
使用 ASHRAE 标准计算 HVAC 管道摩擦损失的完整指南，涵盖摩擦图表、压降分析和高效空气分配设计的系统优化。
HVAC 管道设计：管道压力分类
使用 SMACNA 标准进行 HVAC 管道压力分类的完整指南，涵盖安全高效管道系统的压力等级选择、施工要求和测试协议。
HVAC 管道设计：商业厨房管道尺寸
使用 ASHRAE 和 NFPA 标准确定商业厨房管道尺寸的完整指南，涵盖排气罩设计、油脂管理、消防安全和食品服务运营的新风系统。
HVAC Duct Design: Duct Sizing by Velocity & Noise Criteria (NC)
使用符合 ASHRAE 和 CIBSE 标准的速度和噪声标准确定 HVAC 管道尺寸的完整指南，涵盖敏感应用的声学设计、速度限制和噪声控制。
HVAC 管道设计：通过等摩擦法确定管道尺寸
使用符合 SMACNA 和 ASHRAE 标准的等摩擦法确定 HVAC 管道尺寸的完整指南，涵盖计算程序、摩擦率选择和有效空气分配设计的系统优化。
HVAC 管道设计：管道尺寸 SMACNA 建议
使用 SMACNA 建议确定 HVAC 管道尺寸的完整指南，涵盖等摩擦、速度和静态回弹方法，以及有效空气分配的设计计算和系统优化。
数字工具和资源
Cooltools软件下载
– Cycle analysis (process design) – comparison of one stage direct expansion cycle and one stage flooded cycle. – System sizing – calculation of component sizes from general criteria. – System simulation – calculating operating conditions in a system with known components. Component calculations – calculation of – components efficiencies and outlet conditions. – Evaluation of operation – evaluation of system efficiency. – Process investigation – e.g. moist air calculations.
Refrigerant Ph Diagram (Part 2)
This article is a continuation of our older article, which was well received by users, so we decided to update the P-H Diagram list and provide you with a more complete list of the world’s commercial refrigerants. You can easily access the high quality refrigerant chart by clicking on the refrigerants listed in the table.
Carrier Plv Pro Download
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.
Coolselector Download
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.
Air Conditioning Condensate calculator
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.
管道压降计算：基本方程和指南
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.
mcQuay Duct Sizer下载
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.
Space and Zone Airflow Sizing Calculations in HVAC Systems
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
Download HVAC-Cx: The Essential Building HVAC Systems Commissioning Tool
As buildings continue to evolve toward higher efficiency and more sophisticated control strategies, tools like HVAC-Cx become increasingly valuable. The software’s ability to systematically detect faults, prioritize issues, and assist with active commissioning represents a significant advancement in building operations technology.