ARCC 2202 Lecture Notes - Lecture 9: Color Temperature, Baseboard, Long Term Ecological Research Network
16 Dec 2016
School
Department
Course
Professor
Document Summary
Heating, refrigeration, and air-conditioning institute of canada (hari) American society of heating, refrigerating and airconditioning engineers (ashrae) What does heating and air conditioning mean? increasing or decreasing the temp (heating and cooling) increasing or decreasing humidity (humidify or dehumidify) 2: ensure the air is healthy ( lter out contaminants) Most other buildings this is done by hospitals use uv lights to kill bacterial/viruses. Energy required to change phase of water (ice/liquid/steam) Essentially, mechanical systems use phase changes to transport energy using air/water and/or refrigerants. Refrigerants are natural or engineered substances which can be more easily controlled to change state. Preferred over water as they can transport more energy and can be designed for example temperatures/pressures at which a phase-change occurs. Water is more dense (800x"s) has a higher speci c heat (4x"s) the heat capacity of water is roughly 3200x"s more than air. Note: this conversion ignores changes in state (value is actually higher).
