tailieunhanh - Energy Management Handbook for Homeowners phần 3

Vòng đời Chi phí Các tổng của giá mua và chi phí năng lượng của một thiết bị trong suốt cuộc đời của nó được gọi là chi phí vòng đời của nó. Chi phí vòng đời của các thiết bị năng lượng-hiệu quả thấp hơn so với những các mô hình trung bình. | Heating Options Conservation Devices The number of energy-conservation devices for gas or electric heating systems on the market is growing rapidly. Many of these devices are well constructed and if properly installed are safe. All of these devices except some automatic clock thermostats should be installed by a qualified heating contractor they are not designed to be installed by the do-it-yourselfer. Thermostats Temporary day or night set-back turning the temperature down at night or when no one is at home will save about 1 percent per degree of eight-hour set-back. Note A thermostat should not be located by a direct source of heat . heating vent lamp stereo television or sunlight on an outside wall or under a whole-house fan opening. Permanent set-back setting the thermostat temperature back to a lower setting and leaving it there will always save energy. There are some drawbacks to extreme set-back. Elderly individuals and those with poor health should not set the thermostat down below 68 F. Hypothermia a lowering of body temperature and slow-down of bodily functions could result if the temperature is too low. Set the temperature as low as you can to still be comfortable. Don t forget to add additional layers of clothing so you can be comfortable at lower temperatures. The savings potential is very different between permanent and temporary set-back. For permanent set-back there is a potential energy savings of about three percent per degree of set-back. Clock thermostats will save energy by automatically turning the thermostat down and up on a preset schedule. An advantage is that your home will be warm when you get up or come home. But if you can train yourself to manually turn the thermostat down you can save the same amount of energy. A special type of set-back thermostat is necessary for use with heat pumps. Vent Damper The vent damper is a device that automatically seals the combustion flue gas vent during the off cycle of the gas furnace. This saves .