The Function Of Thermostat

Here's some info about the function of thermostat.

When it is cold, we walk over and turn the thermostat, and when it is hot, and he walked to turn the air conditioner to cool us. But how this small box on the wall, in fact control the temperature of our homes or offices? A mechanical thermostat is actually a very simple device. It is basically a thermometer attached to a switch that turns on the heater, if your heat source is natural gas or electricity. If you remove the cover of your thermostat, you can see the inner workings and have a better idea of how a thermostat. The top layer is mercury thermometer and a coil. Mercury is a small vial filled with liquid metal, mercury. In this bottle son are three: one at the bottom, one to the left of the road, and one to the right of the road. As the temperature rises or cools, the vial of mercury is tilted to the right or left of the corresponding wire in contact with the cable that runs along the bottom. If the mercury is at the far left, there is a link that creates a current that drives a relay which starts the heater and circulating fan. In the room is heated, and once the road turned to the balance, the connection is broken, causing the heater to turn off. If mercury is tilted to the right, another relay to power air conditioning. What are tips from the road in both directions is the thermometer coil that rests against the bottle of mercury. The temperature of the coil consists of a bi-metallic strip of two different types of metal, usually copper and iron, which are glued together. Because the response to different metals at different levels of heat, and that contracts and expands causing the coil to uncurl as wind or temperature changes. This twisting motion is tilted or uncurling vial of mercury, then the signals from the heat source or to start over. By adjusting the thermostat, which are actually adjusting the tightness of the coil. Below the top layer of your thermostat, you can see the circuit board that houses the son of the actual implementation of the fan and the heat source. The circuit is connected to the mercury through a screw and son metal, which "reads" and turn the switch on heating or cooling device. New on the market are digital thermostats. These differ from the mechanical thermostats thermostats that use of a thermistor, an electrical resistor whose resistance changes with temperature. The microcontroller in a digital thermostat measures the resistance and converts that number to a temperature reading. Digital thermostats can save energy because it can be programmed to activate the heating or air conditioning is turned off, or at preset times of the day. For example, you can adjust the air conditioning to come in an hour before returning home to work, or have the heater stays off during working hours while you and then turn on one hour before returning at his home is cozy and warm when you open the door.