Week 1 Lecture Note
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Week 1 Lecture Note: MEC740 ENVIRONMENTAL CONTROL IN BUILDINGS 1/4 Introduction What can you deduce from the title of this course “environmental control in b uildings”? We want to artificially create and maintain an indoor environment to specific criteria by means of u sing a heating, ventilating, air-conditioning and refrigeration (HVAC&R) system. The primary function of a HVAC s ystem is to maintain environment conditions in a space that are: 1. conducive to human comfort, and 2. required by a product or a process within a space. In simple terms, the environmental conditions can be described by 1. temperature 2. humidity 3. air cleanliness and quality 4. air motion 5. noise Environmental conditions in a space are affected by parameters such as: 1. Local atmospheric conditions (ref erred to as outdoor) (e.g. temperature, relative humidity, wind speed and direction, precipitation, sun, etc.) 2. Physical characterist ics of the building (e.g. high rise, materials, glazing, heat sources) 3. Ventilation requirements (e.g. contaminant generation) To maintain the environmental conditions in a space within acceptable limits, HVAC equipment and systems are installed, which provide: (see handout “Basic Terminology”) • heating • cooling • humidification • dehumidification • ventilation (fresh air) • cleaning If the HVAC equipment is sized to provide the acceptable conditions under worst case conditions, i.e. design load, below which, the equipment operates at part load. The refore, automatic controls are necessary to modulate the operation of the equipment. The objective of this course is to dev elop proficiency in the following subjects: 1. learn about the HVAC systems, their characteristics, operation principles, selection and design 2. learn about HVAC system components 3. learn how to select indoor/outdoor design conditions 4. learn how to determine heating/cooling, associated humidification/dehumidification loads, and ventilation requirements 5. learn about control of HVAC systems 6. learn about estimation of energy requirements of HVAC systems 7. use of computer software for load estimation and design
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Transcript of Week 1 Lecture Note
7/27/2019 Week 1 Lecture Note
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