HVAC Exam 1|48 Questions And Answers

Matter exists in what three forms? - ️️solid, liquid, gas What is temperature measured by? Quantity or intensity - ️️Intensity Define British thermal unit (Btu) - ️️Measure of heat energy - amount of energy needed to raise 1 lb of water 1 degree F How much heat is required to raise the temp of 100 lb or water from 70F to 120F - ️️Q=1000lb*(1btu / change of temp) so 1000*(1/ 50) = 50,000 If 750 Btu is supplied to 15lb of water at 72F what will be the resulting temperature? - ️️ 1 Btu raises air - ️️4.75F To melt 1lb of ice you need - ️️144 Btu So to melt 2000 lbs of ice or 1 ton you need - ️️288,000 Btu What is 1 ton of refrigeration? - ️️288,000 Btu / 24 hrs = 12,000 Btu/Hr What is the hottest water can get? - ️️212F 1 Btu raises 1 lb of water - ️️1 degree F