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- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/08%3A_Home_Heating_Systems/8.5%3A_Cooling_and_Heating_(I)A device that moves the heat from a low temperature environment to a high temperature environment is called a heat mover. Thus a heat pump is a device that moves heat from a low-temperature to a high-...A device that moves the heat from a low temperature environment to a high temperature environment is called a heat mover. Thus a heat pump is a device that moves heat from a low-temperature to a high-temperature environment with the help of work that is put in. The earth is used as a heat sink in the summer and a heat source in the winter; the pump relies on the relative warmth of the earth for its heating and cooling production.
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/09%3A_Home_Cooling/9.06%3A_New_PageBut only ventilate during the coolest parts of the day or night, and seal off your house from the hot sun and air during the hottest parts of the day. Open windows on the side from where the breeze is...But only ventilate during the coolest parts of the day or night, and seal off your house from the hot sun and air during the hottest parts of the day. Open windows on the side from where the breeze is coming and on the opposite side of the house. Look for the Energy Guide label indicating the annual estimated cost for operating the appliance or a standardized efficiency ratio, and use this information to select the most efficient model for your needs.
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/02%3A_Energy_Supply_and_Demand
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/05%3A_Appliances/5.05%3A_New_PageThe basic principle for cleaning clothes has remained unchanged—wet the garment, agitate it to loosen the dirt from the cloth fibers and then use more water to rinse the dirt off. As an alternative, t...The basic principle for cleaning clothes has remained unchanged—wet the garment, agitate it to loosen the dirt from the cloth fibers and then use more water to rinse the dirt off. As an alternative, the horizontal axis (h-axis) washer tumbles the wash load repeatedly through a small pool of water at the bottom of the tub to produce the needed agitation.
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/01%3A_Energy_and_Society/1.05%3A_New_PageWhile both cyclists did the same amount of work (since they both pedaled for 10 miles) and used the same amount of energy (218 calories), the blue cyclist used the most power, because he did the same ...While both cyclists did the same amount of work (since they both pedaled for 10 miles) and used the same amount of energy (218 calories), the blue cyclist used the most power, because he did the same amount of work over a shorter period of time. Units of power are measured in terms of units of energy used per some unit of time. \[ Cost \, of \, Energy = (Energy \, Used) * (Cost \, of \, the \, Unit \, of \, Energy) \]
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/02%3A_Energy_Supply_and_Demand/2.05%3A_New_PageAccording to the US CIA The World Factbook, the US has the 5 th largest reserves of natural gas. At the current rate of consumption, the approximate lifetime of the world’s petroleum, natural gas, and...According to the US CIA The World Factbook, the US has the 5 th largest reserves of natural gas. At the current rate of consumption, the approximate lifetime of the world’s petroleum, natural gas, and coal reserves is 50 years, 52.8 years, and 153 years, respectively. (BP Statistical Review of World Energy) Because we import more than one half of the consumption, the petroleum reserves at the current rate will last about 11 years.
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/zz%3A_Back_Matter
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/06%3A_Lighting/6.01%3A_New_PageRecall that a watt is a unit of power, (i.e., the rate at which energy is consumed from the electricity supplier). All lamps are rated in lumens, as shown in the figure below, and every bulb has 3 par...Recall that a watt is a unit of power, (i.e., the rate at which energy is consumed from the electricity supplier). All lamps are rated in lumens, as shown in the figure below, and every bulb has 3 parameters listed on the package, as shown in Figure 6.1.1: The average footcandle level on a square surface is equal to the amount of lumens striking the surface, divided by the area of the surface.
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/00%3A_Front_Matter
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/05%3A_Appliances/5.03%3A_New_PageEither a heat-transfer fluid or the actual potable water to be used flows through tubes attached to the absorber and picks up the heat from it. (Systems with a separate heat-transfer-fluid loop includ...Either a heat-transfer fluid or the actual potable water to be used flows through tubes attached to the absorber and picks up the heat from it. (Systems with a separate heat-transfer-fluid loop include a heat exchanger that then heats the potable water.) The heated water is stored in a separate preheat tank or a conventional water heater tank until needed.
- https://eng.libretexts.org/Bookshelves/Environmental_Engineering_(Sustainability_and_Conservation)/Energy_Conservation_for_Environmental_Protection_(Pisupati)/09%3A_Home_Cooling/9.04%3A_New_PageIf a 1970s-vintage room air conditioner with an EER of 5 is replaced with a new one with an EER of 10, air conditioning energy costs will be cut by 50 percent. Replacing a 1970s-era central air condit...If a 1970s-vintage room air conditioner with an EER of 5 is replaced with a new one with an EER of 10, air conditioning energy costs will be cut by 50 percent. Replacing a 1970s-era central air conditioner with a SEER of 6 with a new unit having a SEER of 12 will cut your air conditioning costs in half. Today's best air conditioners use 30% to 50% less energy to produce the same amount of cooling as air conditioners made in the mid 1970s.
