Assignment 1: Journal - Hvac

Queensland University of Technology

School of Chemistry, Physics and Mechanical Engineering

ASSIGNMENT 1: JOURNAL

Unit: ENB423 - Heating, Ventilation & Air conditioning

Student:

Student Number:

May, 2014

Contents

Heating, Ventilation & Air Conditioning systems 3

Thermal Principles and Psychrometric Analysis 5

Human Comfort and Indoor environmental Quality 7

Heating Load Calculations 9

Cooling Load Calculations 11

Air Handling and Distribution Systems 13

Heating, Ventilation & Air Conditioning systems

Heating

Heating is one of the main aspects of air conditioning, which is the process of adding thermal energy to a determined space. It may happen for two reasons, whether for bring this space to a determined temperature, whether to maintain it because it has been losing energy to colder surroundings (McQuiston, Parker, & Spitler, 2005). The process of heat transference may occur in such different way including convection, radiation, by electricity’s transfer or heated water (warming up the air). Also related to this topic, it is important state that sensible heat transfer is the process of maintaining or raising the temperature of the air manifested solely (ASHRAE, 2009).

Cooling

Cooling is also another crucial concept for air conditioning, which has been applied to residential buildings and industries to provide a comfortable environment for living in or for machinery that needs special temperatures to run (ASHRAE, 2009). Cooling can be defined as a transfer of energy from an air supplied (could be an office or a house) to a space, so that the temperature at this air supplied place would decrease to a desired one. According to (McQuiston, Parker, & Spitler, 2005), “energy is carried from the conditioned space to a refrigerating system and from there eventually dumped to the environment by condenser units or cooling towers”.

Air conditioning systems

This topic is vital for this entire unit, once it is...