Estudio de presiones en secciones en T en sistemas de calefacción, ventilación y aire acondicionado

Abstract

[EN] The aim of this work is to study the changes in pressure in T-sections in junctions of air conditioning systems, and the study of classical designs of flow ducts as well as the equations and theories used to obtain the major and minor pressure losses in junctions. The objective is to understand the Z factor in different conditions with the already existing ones in the ASHRAE tables. In this work we have designed a HVAC (Heating, Ventilation, Air Conditioning) system with 90o angled tees with typical criteria for a real life situation in realistic conditions; including different sizing for the main duct and its respective branches. After determining the operation conditions of our HVAC, by means of an equation solver such as EES, we are able to calculate the different diameters required for our system in a pre-design. Once we have done our pre-design, we are able to obtain the normalized diameters of the ducts. With these, we design a realistic system using real ducts, taking into account the data obtained in the pre-design. One of the main purpose of this study is to visualize the pressure drop throughout the system and how both fittings and friction contribute.

[ES] El objetivo de este trabajo es estudiar los cambios en la presión en las secciones en T en los cruces de los sistemas de aire acondicionado, y el estudio de los diseños clásicos de conductos de circulación, así como las ecuaciones y teorías utilizados para obtener las pérdidas de mayor y menor presión en los cruces. El objetivo es entender el Coeficiente de Pérdidas Menores (factor Z) en diferentes condiciones y compararlo con los valores ya existentes en las tablas de ASHRAE.