Building HVAC Training Course, CFD Simulation for All Levels

The ANSYS Fluent software was used to simulate the natural convection of a solar chimney in this project. The primary objective of this study is to examine natural convection while taking into account the buoyancy force. A solar chimney is a passive solar heating and cooling system that effectively controls the temperature of a structure and offers ventilation. Solar chimneys, similar to Trombe walls or solar walls, are a method for achieving energy-efficient building architecture. Solar chimneys are essentially hollow conduits that establish a connection between the interior and outside sections of a building.

The project's geometry was constructed using ANSYS Design Modeller software, while its mesh was generated using ANSYS Meshing Software. This mesh type is organized systematically, with a total of 510,000 cells.

Computational Fluid Dynamics Methodology

The energy equation is utilized in this simulation to calculate the variations in temperature and mimic the transfer of heat. The influence of gravity has allowed us to recognize the buoyancy force as a significant force in natural convection. In addition, we have taken into account the use of an absorber on this chimney, with a heat flow of 55 W/m^2.

The outcomes

Upon the completion of the solution, the contours for velocity, pressure, and temperature were acquired. Velocity vectors and streamlines were also depicted. The results unequivocally demonstrate the occurrence of spontaneous convection heat transfer in this issue. Based on the vectors and flow lines, it is evident that the buoyancy force exerted a significant influence, making it the primary force in heat transmission. Furthermore, the mass flow rate was determined at a vertical distance of 0.5 meters, yielding a value of 0.128 kg/m3.

The issue involves modeling the airflow around the external structure of swamp coolers for cross-ventilation using ANSYS Fluent software.

The geometry was created using the ANSYS Design Modeler software.

The mesh on this geometry was generated using ANSYS meshing software. The numerical value of the element is 84594.

The Energy equation is activated to measure the temperature.

The current issue is the simulation of heat movement within a room using ANSYS Fluent software, specifically focusing on HVAC analysis.

We utilize the Design Modeller program to execute the current 3-D model.

The room and heater are meshed using ANSYS Meshing software, which has a structured mesh type. The numerical value of the element is 87865.

Accounting for natural convection and the influence of buoyancy.

This research aims to analyze the airflow patterns generated by a swamp cooler inside a room using ANSYS Fluent software.

The project's geometry is created using ANSYS Design Modeller. The current mesh has been generated using ANSYS meshing. The mesh is organized and consists of 120,250 elements.

The Energy equation is utilized to compute the temperature distribution inside the computing domain.

Overview of the Project

The present study involves the simulation of forced convection heat transfer in a U-Bend configuration with a heat flux applied to its outer walls, utilizing the ANSYS Fluent software. The objective of this study is to examine the phenomenon of forced convection. In this simulation, the water flow in the U-bend is taken into consideration.

The ANSYS Design Modeller software was used to produce the 3D model for this project. The pipe has a diameter of 13 mm. There are perforations in the plates at the bend, each with a diameter of 70 mm. Their axial distance measures 20 mm, whereas their transverse distance measures 16 mm.

The geometry has been meshed using ANSYS Meshing software. The mesh is of an unstructured form and consists of 2,595,714 cells. Subsequently, we imported it into the ANSYS Fluent software and converted it into a polyhedral mesh.

Methodology

The domain is subjected to a water flow at a velocity of 0.0158 m/s. The simulation exhibits laminar flow, and we have activated the laminar flow by selecting the viscous model. Additionally, a heat flow of 32087 W/m^2 is applied to the exterior wall to account for forced convection. We have implemented the energy equation to calculate the variations in temperature.

Results of forced convection heat transfer in a U-bend

Upon completion of the solution, contours of temperature, velocity, and pressure are acquired. From the contours, it is evident that heat transfer has occurred effectively. We have acquired the local heat transfer coefficient (=220.9961), as well as the average heat transfer coefficient (=25.78288 Nusselt number), pressure drop (=2.15), and friction factor (=0.35).

The issue is the numerical simulation of the Floor Heating System utilising the ANSYS Fluent software.

The 3-D model is created using the Design Modeller software.

The model is meshed using ANSYS Meshing software, resulting in a total of 93280 elements.

We employ the Ideal Gas approach to analyse heat transfer using natural convection.

Overview

Air conditioning is a crucial field within the realm of mechanical engineering. Controlling the temperature of a room or structure has consistently been a primary focus for air conditioning designers. The exorbitant energy expenditure associated with providing conditioned air for each structure has necessitated the development of the most optimal air conditioning system for each individual building. These designs necessitate extensive examination and investigation, encompassing both the expenses associated with construction and maintenance as well as the pursuit of optimal performance. Simulating and analysing these systems can effectively help determine the most suitable ventilation system for each structure.

Overview of the project

The ANSYS Fluent software was used to simulate and analyse the heat transfer of an underfloor heating system in a confined area in this project. The underfloor heating system is supposed to generate heat flux, which is specifically assigned to the bottom wall. The other walls are thought to be adiabatic, meaning they do not allow heat transfer. Given that this analysis utilises an underfloor heating system for heat generation, no fluid flow intake is included in this project. Only a pressure output is specified. Heat transmission occurs through free convection, and the force of gravity must be taken into account. The relationship between energy and the k-epsilon model Realisable models are employed to solve the energy equation and fluid flow parameters and to comprehensively examine the impacts of buoyancy and volumetric forces arising from density variations. It is essential to mention that the ideal gas model has been employed to ascertain the relationship between density changes and temperature.

Geometric and mesh representation

The geometry necessary for this project entails creating a room using Ansys Design Modeller software and then applying a mesh using Ansys Meshing. The geometry utilises an unstructured mesh type with a total of 124,325 elements.

The issue involves the numerical simulation of room air conditioning with a heat source using ANSYS Fluent software.

The 3-D model is created using the Design Modeller software.

The model is meshed using ANSYS Meshing software, resulting in a total of 98924 elements.

The Energy Equation is employed to account for the flow of thermal energy.

Design Modeler and ANSYS Meshing

Summary

A plate heat exchanger is a type of heat exchanger that utilizes parallel series plates with metal plates in the center to facilitate the transfer of heat between two fluids. The fluid traverses the gap between two neighboring plates. The advantage of a Plate Heat Exchanger over traditional heat exchangers lies in the increased exposure of fluids to a greater surface area.

This project involves the modeling of four solid plates, with four pipes positioned at the corners of the plates. The fluid, specifically water, moves through the pipes at a consistent speed but at varying temperatures of 20 and 40 degrees Celsius, flowing in opposite directions.

The solution's geometry is created using the Design Modeller software, with all the solids originating from a single part. The solids have dimensions of 2 by 2 meters, with a thickness of 0.2 meters. The pipe has a diameter of 0.2 meters and a length of 1.1 meters. Ansys meshing software is utilized to generate solution meshes. The elements lack organization, and the total number of elements is 2216379.

This CFD project is the second installment of the ANSYS Fluent General Training Course.

Approach: Computational Fluid Dynamics (CFD) Simulation of Plate Heat Exchanger

The pressure-based solver has been utilized because the fluid is incompressible. Furthermore, the simulation is not influenced by time and has been executed in a steady state. Furthermore, the gravitational effects are disregarded. Convection occurs between the water and pipes, while conduction takes place within the solids, facilitating the passage of heat over the entire domain. The study focused on Conjugated Heat Transfer (CHT).

In conclusion

Upon completion of the solution process, two-dimensional contours and vectors representing water pressure, temperature, turbulence kinetic energy, and velocity are acquired. As seen, water circulates through the pipes at temperatures of 200k and 400k, representing high and low temperatures, respectively, in opposite directions.

The initial mechanism of heat transfer is convection, which occurs between the fluid and the walls of the pipe. Next, it is the conduction's turn. The heat is transferred from the water to the solid through conduction.

The figures clearly display the temperature gradient with contour lines. Fluid velocity is a crucial factor that influences heat transmission. Greater water velocity results in increased convective heat transfer.

The issue involves numerically simulating the conjugate heat transfer of airflow in a simplified 4-story wind tower using the ANSYS Fluent program.

The 2-D model is created using the Design Modeller software.

We utilize the ANSYS Meshing software to create a mesh for the model.

The mesh is structured with a total of 6375 elements.

The Boussinesq model is utilized to incorporate the variations in air density resulting from temperature fluctuations.

The issue involves the numerical simulation of a double-skin facade utilizing the ANSYS Fluent program.

The 3-D model is created using the Design Modeller software.

The model is meshed using ANSYS Meshing software, resulting in 490,725 elements.

The Ideal Gas option for air density is defined to account for the buoyancy effect.

We establish a Heat Source specifically for the glass component.

The issue involves the numerical simulation of Storage Container Room Ventilation using the ANSYS Fluent.

The 3-D model is created using the Design Modeller software.

We utilize the ANSYS Meshing to generate a mesh for the model.

The mesh is structured with a total of 115,635 elements.

The Energy Equation is utilized to account for the process of heat transmission.