By Suzanne Wallace. By Roger Cladingboel. Date Published 25th Jun From a design-engineering perspective, there are two important implications: Accurate model geometry is necessary and should account for all surfaces of a space or room including the internal walls, ceilings and floors. On some occasions, a ground-contact floor with high thermal mass may even remove heat from a space during a cooling load calculation. Solar tracking should be accounted for in all spaces, including interior spaces which may receive solar radiation in the morning or late afternoon when the sun angle is lower.
Conductive, convective, and radiative heat balance is calculated directly for each surface within a room, so tracking the incident solar radiation is critical to accurate calculations of solar gains in perimeter and internal spaces. In Figure 1, the cooling load report for an internal zone shows From a design-engineering perspective, there are three important implications: Designers should consider performing cooling load calculations for rooms and zones with all of the internal gains fully on e.
Note, when sizing central HVAC equipment e. Some exceptions may include a laboratory, healthcare or pharmaceutical application which may have a constant ACH requirement. The design data includes maximum external dry-bulb temperature conditions for each month and corresponding monthly coincident wet-bulb temperature conditions, should the latent load or lower sun angle be the influential cause of the peak condition.
Understanding Psychrometrics, 3rd ed. This reference serves as a basic refresher course for those who use psychrometrics on a recurring basis and provides a four- to six-hour psychrometrics learning module to students; air-conditioning designers; agricultural, food process, and industrial process engineers; meteorologists and others. HVAC Simplified. This text provides an understanding of fundamental HVAC concepts and how to extend these principles to the explanation of simple design tools used to create building systems that are efficient and provide comfortable and healthy environments.
Home Technical Resources Bookstore. Load Calculation Applications Manual. Share This. Look inside The Complete Applications-Oriented Resource for Load Calculations This second edition of Load Calculation Applications Manual, available in both I-P and SI units, is an in-depth, applications-oriented reference that provides clear understanding of the state of the art in heating and cooling load calculation methods, plus the tool and resources needed to implement them in practice.
New internal heat gain data for office equipment New methods and data for the effects of internal shading on solar heat gains New data on heat gains from kitchen equipment, based on experimental measurements New weather data for more than 6, stations worldwide A new ASHRAE clear-sky model, applicable worldwide Improved methods for generating design day temperature profiles A major revision of thermal properties data for building materials This essential engineering reference begins with an overview of heat transfer processes in buildings and a discussion of how they are analyzed together to determine the HVAC load.
0コメント