2.2.6 Lab_ Investigate Passive Heating and Cooling (2).pdf...

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2.2.6 Lab: Investigate Passive Heating and CoolingWet LabAP Environmental Science Sem 1Points Possible:40Name:Lauren KaneDate:Investigate Passive Heating and CoolingMost of these principles involve taking advantage of the sun's rays, the movement of airmasses, the heat capacity of water, and insulation.The sun's rays:The sun's rays carry energy that warms the materials they strike and then the airaround those materials. Blocking these rays causes a home to be less warm,while absorbing this energy increases heat.Knowing the angles of the sun's position in the sky during the summer and wintercan help architects to design homes that can block the summer rays and catchthe winter rays.Dark-colored materials absorb the energy of the sun's rays, and light-coloredmaterials reflect that energy.Areas with large windows can act like a greenhouse, letting in large amounts oflight and heat but not letting that heat escape. This greenhouse effect can warma house.Awnings, blinds, and shades can be moved to let in light during the winter andblock or redirect it during the summer.Make use of deciduous trees and landscaping to block the sun in the summerand let it in through the winter.Movement of air masses:
Cool air sinks, and warm air rises. Warm air will always move to the top of ahome.Upward-sloping roof angles can move air to vents at the top of the home, awayfrom the living area.Moving air cools. Breezes through a home can cool it. Fans and windowspositioned in certain areas can cause cross breezes that enable cooling.Heat capacity of water:Water has a higher specific heat capacity than air, which means that it will absorbmore energy than air to increase in temperature by the same amount, and it willlose energy (heat) more slowly than the air around it. Air moved over cool orwarm bodies of water will cool and warm accordingly.Underground pools of water can cool air blown over them and direct it into ahome.Insulation:Insulation is layers of materials that trap heat. Good insulation in walls, ceilings,and roofs can trap heat inside during the winter and keep heat from enteringduring the summer.Double-paned windows increase insulation.Vents can be louvered, which means they can have moving slats or blinds thatcan be opened to let air through or closed to keep air in or out.Some choices in home materials (for example, flooring tiles instead of carpet)trap heat, while others readily transfer heat.In this lab, you will be researching some of these ideas and then modeling how some of thesefactors affect the heating and cooling of a home. First, you will build a home without any of theseenergy-saving improvements. Then you will change your home design to be moreenergy-efficient. You will test both homes and evaluate their energy efficiency by measuringtemperature changes in each when they are exposed to a warming source of light.

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