hvac-eng

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Nonlinear optimal control of heat pumps in electric vehicles

Volume 31, Issue 5, May – June 2025, Page 563-580. Source link

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Infectious droplet dispersion in an airliner cabin with the personalized mini-environment control system

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Standardizing Energy Efficiency Measures: Key to Better Building Performance

The building energy efficiency industry faces a significant data management challenge. As energy audits, models, and efficiency programs proliferate, we’re generating unprecedented amounts of EEM data. However, without standardized naming conventions, meaningful comparison becomes nearly impossible. What one program calls an “apple,” another might label an “orange” or “pear,” creating confusion…

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Experimental investigation of human local thermal sensation, skin temperature and skin heat flux of the lower human body under personalized heating conditions

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Experimental analysis of defrost performance in a variable frequency refrigerator with adaptive defrost method

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BIM Software Solutions for Modern HVAC Applications

As the HVAC industry continues to evolve in 2025, Building Information Modeling (BIM) has become an indispensable tool for professionals seeking to optimize design, installation, and maintenance processes. For HVAC engineers, contractors, and technicians, selecting the right BIM software can significantly impact project efficiency and outcomes. Let’s explore the most effective BIM solutions for…

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Weather Design Conditions (ASHRAE)

ClimaticDesignInfo is a web app providing ASHRAE Climatic Design Information for over 8,118 global locations. It features an interactive map and allows downloading data in SI and IP units, supporting HVAC and energy-related applications across multiple sectors. ClimaticDesignInfo is a comprehensive web application designed to provide easy access to Climatic Design Information (CDI) from the…

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Download EVAP-COND 5.0: The Ultimate Heat Exchanger Simulation Tool for HVAC Engineers

In today’s energy-conscious world, optimizing HVAC systems has never been more critical. As a mechanical engineer who has worked extensively with heat exchanger design, I’m excited to share insights about EVAP-COND 5.0, NIST’s powerful simulation package that’s transforming how we design and analyze finned-tube evaporators and condensers. EVAP-COND represents the culmination of decades of…

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Download HVAC-Cx: The Essential Building HVAC Systems Commissioning Tool

As building systems become increasingly complex, the need for efficient commissioning and monitoring tools has never been more critical. HVAC-Cx, developed by the National Institute of Standards and Technology (NIST), stands out as a powerful semi-automated commissioning software tool that’s transforming how we analyze and optimize HVAC performance in commercial buildings. Having worked…

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Refrigeration Evaporator Sizing and Selection

The evaporator is a critical component in any refrigeration system, serving as the heart of the cooling process. Proper sizing and selection of evaporators directly impacts system efficiency, operating costs, and cooling performance. This report examines the methodical approach to evaporator sizing and selection, combining engineering principles with practical considerations for optimal system…

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Refrigeration Condenser Sizing and Selection

Proper sizing and selection of condensers is critical for refrigeration system efficiency, performance, and longevity. The condenser, a vital component in the refrigeration cycle, rejects heat from the system to the surrounding environment. This report presents a detailed analysis of the condenser sizing and selection process, covering fundamental principles, methodologies, and critical…

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Refrigeration Expansion Valve Sizing and Selection Process

Proper expansion valve selection is critical for refrigeration system efficiency and reliability. This guide outlines the systematic approach to sizing and selecting expansion valves based on system requirements and operating conditions. Expansion valves regulate the flow of refrigerant into the evaporator, making their correct selection essential for system performance, energy efficiency, and…

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Design Procedures for Heating-Only Systems: Airflow Calculation Methods and Technical Considerations

Advanced Airflow Calculation Methods for Heating-Only Systems In our previous article, we explored the 8-step methodology for designing heating-only HVAC systems. Today, we’ll delve deeper into the technical aspects of space and zone airflow calculations—a critical component in Step 3 of the design process. Proper airflow calculations are essential for system performance, ensuring thermal…

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Design Procedures for Cooling-Only Systems: Detailed Airflow Calculation Methodology

Technical Deep Dive: Airflow Calculation Methods for Cooling-Only Systems Following our 8-step methodology for designing cooling-only HVAC systems, 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…

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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 calculations. This knowledge forms the foundation for properly dimensioned HVAC systems that deliver optimal performance and efficiency. Design Procedures for Cooling/Heating Systems Understanding Airflow Sizing…

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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. Design Procedures for Cooling-Only Systems: An 8-Step Methodology Design Procedures for…

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Design Procedures for Cooling-Only Systems: An 8-Step Methodology

Designing efficient cooling-only HVAC systems requires a structured approach to ensure optimal performance and appropriate equipment sizing. The following 8-step procedure provides a comprehensive framework for designing these systems, where peak cooling loads determine the airflow requirements for system components. Design Procedures for Cooling/Heating Systems Step 1: Calculate Space Sensible…