HRAD 3473 WEEK 9 NOTES
HRAD 3473 WEEK 9 NOTES HRAD 3473
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This 3 page Class Notes was uploaded by Nichole Pike on Monday October 17, 2016. The Class Notes belongs to HRAD 3473 at Oklahoma State University taught by Ryan in Fall 2016. Since its upload, it has received 5 views. For similar materials see Mechanical Equipment and Facility Management in Hotel and Restaurant Administration at Oklahoma State University.
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Date Created: 10/17/16
WEEK 9 HRAD 3473 DISCLAIMER: THESE NOTES WERE TAKEN FROM WHAT WAS RETAINED FROM CLASS LECTURE AND TEXTBOOK READINGS. THESE ARE IN NO WAY COMPREHENSIVE, BUT SHOULD BE USED IN CONJUNCTION WITH CLASS MATERIALS PROVIDED BY THE PROFESSOR. ENGINEERING PRINCIPLES BASIC PHYSICS when you change one element of heat you have the potential to change a variety of different things power is a use of energy fuel changes when it is used potential energywaiting for something to happen kinetic energy LAWS OF CONSERVATION creates light, heat sound, air pressureall these are other forms of energy if we can collect all these forms of energy and weigh it, it weighs the same as the amount of fuel that was used at the beginning WATER, STEAM AND AIR fluids can be pumped; air is pumped through HVAC when liquid is pumped, it creates friction and gravity slows it down FRICTION aka resistance THERMODYNAMICS HEAT thermodynamics: basically the cornerstone of heat only heat and a lack of heat heat is based on the movement of molecules and the level of resistance that the molecules encounter heat is produced when molecules bump into each other measure of heat: ex. Celsius, Fahrenheit measurement of heat is quantity TEMPERATURE temperature is not heat, it includes 3 factors heat molecular movement humidity and air speed humidity is water in the air temperature results in the way you feel (quality) humidity is created from sweat evaporating and going into the air places like Mississippi already have a high humidity value and the sweat stays on the skin longer because it doesn’t have anywhere to go older peoples systems decline with age physiological factor in females and males is different and also id different stages of life also differs based on activities ex. wedding activities: eating, dancing, drinking THERMAL EQUILIBRIUM this law is unchangeable (law of physics) heat will move whatever has a higher heat value to that of a lower value in order to become equal your body temp (89.6) and the room (70); your body is trying to expel heat to make the room the same temp (why you fill chilled) this thermal equilibrium is happening everywhere with everything this is measured in British Thermal units (BtU) BtU is the amount of heat required to raise one pound of water one degree Fahrenheit we are trying to understand that heat is always seeking balance by putting an insulator around you when there is a lack of heat slows down the thermal equilibrium (wearing a sweater or jacket) STATES OF MATTER solid liquid gaseous things can be in different states of matter because of molecular movement HEAT TRANSFER as heat achieves equilibrium we can do different things to it this is the road you take to get to the equilibrium conductionheat transfer through direct contact convectionheat transfer through a liquid or a gaseous medium ex. drop pasta into boiling water, French fry into fryer ex. fan radiationheat transfer through electromagnetic energy microwave and sun are the 2 biggest ones inductionspecialized form of electromagnetic energy used in food service (used in buffets, etc) special pan with disk on or in it in reality we are generally using a couple of methods at the same time for heat transfer HEAT TYPES essentially 3 types of heat sensible heat is defined as heat of the item itself ex. thermometer in mouth specific heat is based on density and the ability of the item to allow heat to go through ex. water in a bottle, layering of clothes different materials have a different ability to allow heat through it (insulation) latent heat is that associated with a change of state ex. moving from a solid to a liquid to a gas latent heat of vaporizationmoving from a liquid to a gas latent heat of condensationfrom a gas to a liquid latent heat of sublimation from gas to liquid (2 way arrow) latent heat of fusion from solid to liquid (2 way arrow)
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