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Is it more energy efficient to raise the AC thermostat during the day then cooling down the house at the end of the workday or leaving the thermostat at the lower temperature all day?
Wiki User
∙ 16y ago
Typically it is more efficient (and cheaper) to use a set back thermostat. Here is the most basic reason. The rate at which heat is gained or lost by a home or building depends on the difference in temperature between the indoors and the outdoors. Setting the temperature back (higher in the summer and lower in the winter) decreases this temperature difference and thus the total amount of heat gained or lost by the building. When you raise your AC thermostat during the day when no one is home and then cool the house back down in the evening, the total amount of heat removed by the AC during this cycle is less then if you left it cool for the entire time.
Wiki User
∙ 16y ago
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Should you install a programmable thermostat for radiant water heating?
I think if you are using a radiant heating system like warm board that can respond quickly to changes in temperature then a programmable thermostat makes sense. However if you are using concrete slab radiant heat, which takes a long time to heat up and cool down a programmable thermostat will be less efficient than leaving it at one set temperature.
AC sub cooling reading?
How do you measure Sub-Cooling for a R-22 AC system SUB-COOLING IS THE THE "HEAT BELOW SATURATION". THE SUB-COOLING LEAVING THE CONDENSER IS CALCULATED BY TAKING THE (ACTUAL)CONDENSING TEMPERATURE AND THEN SUBTRACTING (MINUS)THE LIQUID REFRIGERANT TEMPERATURE (USE THE CHART)LEAVING THE CONDENSER.=THE SUBCOOLING. NORMAL SUBCOOLING AT THE CONDENSER OUTLET SHOULD BE 10*F. THIS WILL ENSURE THAT LIQUID WILL NOT FLASH INTO VAPOR BEFORE IT GETS TO THE EXPANSION VALVE, SHOULD THERE BE A SLIGHT INCREASE IN TEMPERATURE OR A SLIGHT DECREASE IN PRESSURE DUE TO A PRESSURE DROP. SUB COOLING INCREASES CAPACITY & PREVENTS FLASH GAS IN THE LIQUID LINE AHEAD OF THE EXPANSION VALVE. I HOPE THIS IS VERY CLEAR, AND HELPS U FIGURE OUT HOW TO MEASURE IT. TODD S. FISCHER, PRESIDENT OF THE TAMPABAY CHAPTER OF RSES THE REFRIGERATION SERVICE ENGINEERS SOCIETY- BECOME A MEMBER SOON!!
Why doesn't the temperature of solid increase while melting?
Because all the heat energy is going into the phase change itself, leaving none left over to raise the temperature.
What is newtons law of cooling?
AnswerNewton's law of cooling describes the rate an object will cool at when placed in surroundings of lower temperature. The law is derived by some basics of calculus, but based on one fact: the rate of cooling of an object is proportional to the difference in temperature between the surroundings and the object. It does assume some things and simplifies others (such as where the energy goes after leaving our object and the energy flow through the object between areas with different temperature - inside and outside) but is generally a very good approximation. Various forms of the original equation can be used depending on purpose, but solving is a lot simpler. dTt/dt = -ΔTt/t0, where Tt is the temperature of the object at a given time, t is time, and t0 is a time constant. This is a differential equation, and can be integrated to give us a solution: ΔTt = ΔT0 * e-rt, where r = 1/t0 is the time constant and e is the natural log base.
Explain why evaporation is a cooling process?
The molecules in any substance do not have exactly the same energy: there are those with more (hot) and those with less (cool). Temperature is a function of the distribution of energy through the molecules: the higher the overall energy of the molecules, the higher the temperature. Evaporation occurs when the higher energy (hot) molecules leave the substance exactly because their energy is above average (they are too hot). This leaves behind lower energy molecules (cooler molecules) which, in turn, means that the overall energy of the substance diminishes. Another way of putting it: leaving behind cooler molecules means the temperature goes down closer to them. Its a heat exchange. like the high energy molecule evaporate and then the low energy remain in the material low energy means cool molecules remain at the surface. its a cooling process in this way.
Should you install a programmable thermostat for radiant water heating?
I think if you are using a radiant heating system like warm board that can respond quickly to changes in temperature then a programmable thermostat makes sense. However if you are using concrete slab radiant heat, which takes a long time to heat up and cool down a programmable thermostat will be less efficient than leaving it at one set temperature.
Can you run a 1996 Honda accord without a thermostat?
Can? Yes, but should you? No. The thermostat is an integral part of the cooling & emissions system. The thermostat allows the engine to reach optimum operating temperature very quickly which is a good thing. Without a thermostat the engine will take much too long to reach this temperature and in fact it may never reach it's correct operating temperature. Engines run poorly when cold. Once the engine reaches its operating temperature (generally about 200 degrees F, 95 degrees C), the thermostat opens. By letting the engine warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions. The engine will get better mileage and last much longer. Install the correct thermostat and forget about leaving it out. There is no good reason to run an engine without a thermostat.
Why does Overflow Reservoir on 1999 Ford Taurus keep overflowing gauge doesn't read hot changed the hoses flushed Radiator replaced Thermostat and reservoir?
It sounds like you have a blown head gasket. Combustion gases can enter the cooling system through either a blown head gasket or cracked cylinder head. The gases (under pressure) force coolant out of the reservoir. This also causes a void in the upper part of the cooling system , leaving no coolant at the thermostat and the coolant temperature sending unit. The result is a erroneous temperature Reading and will even prevent the thermostat from opening.
AC sub cooling reading?
How do you measure Sub-Cooling for a R-22 AC system SUB-COOLING IS THE THE "HEAT BELOW SATURATION". THE SUB-COOLING LEAVING THE CONDENSER IS CALCULATED BY TAKING THE (ACTUAL)CONDENSING TEMPERATURE AND THEN SUBTRACTING (MINUS)THE LIQUID REFRIGERANT TEMPERATURE (USE THE CHART)LEAVING THE CONDENSER.=THE SUBCOOLING. NORMAL SUBCOOLING AT THE CONDENSER OUTLET SHOULD BE 10*F. THIS WILL ENSURE THAT LIQUID WILL NOT FLASH INTO VAPOR BEFORE IT GETS TO THE EXPANSION VALVE, SHOULD THERE BE A SLIGHT INCREASE IN TEMPERATURE OR A SLIGHT DECREASE IN PRESSURE DUE TO A PRESSURE DROP. SUB COOLING INCREASES CAPACITY & PREVENTS FLASH GAS IN THE LIQUID LINE AHEAD OF THE EXPANSION VALVE. I HOPE THIS IS VERY CLEAR, AND HELPS U FIGURE OUT HOW TO MEASURE IT. TODD S. FISCHER, PRESIDENT OF THE TAMPABAY CHAPTER OF RSES THE REFRIGERATION SERVICE ENGINEERS SOCIETY- BECOME A MEMBER SOON!!
Which way do you put in a thermostat when you don't have one in to compare it to?
The spring side goes down into the thermostat body.. leaving the nipple end upwards
Can you run a reducer rather than a thermostat in a '95 240sx?
if you are going to install anything other than a thermostat, then you are better off leaving nothing. the car will run find without a thermostat, in warm weather. it will still run without a thermostat in cold weather, but i do not recommend it because it will leave the valve open and the radiator fluid will be constantly flowing through the motor. what the thermostat does is block off the flow until the car reaches approx 170 degrees F. then once it reaches this temperature, the thermostat opens up allowing the fluid to flow, and thus cooling off the motor. so, without a thermostat it will just constantly flow, and will simply take longer to warm up. I've ran with without a therm. throughout winter without a problem, but you will have to let it run for 10-15 minutes until the temp. warms up. the thermostat is only a $12-$20 piece, so at that price, why not have one?
Does leaving lights on raise the temperature in a room?
It's all heat input, if you have several bulbs each taking 100 watts, it will be a significant addition to other heating you may have. Of course if the room has a thermostat, this will cut down the other main heating to keep temperature steady
How do the pumps thermostats radiator and coolant in a car cooling system maintain the motor at a relatively constant operating temperature?
The thermostat is key to maintaining relatively constant temperatures. It is basically a temp. sensitive spring operating a plug. It can be open or closed or partially open, depending on the engine temperature. When the car is cold, the thermostat almost completely prevents coolant from entering or leaving the engine. As the engine warms up to operating temperature and higher, the thermostat opens and allows coolant to circulate from the engine to the radiator. If the engine becomes too cool, the thermostat will close again. Coolant circulation is aided by the waterpump. When the engine's heat contained in the coolant reaches the radiator, it passes through a maze of finned tubes which allow the heat to transfer to the air flowing through (sometimes aided by a fan) the radiator. Now the cooled coolant circulates back into the engine to absorb more heat and repeat the cycle.
Why is there a spring in a hose leaving the thermostat in your 1997 Cadillac deville?
to keep the hose from collapsing
Why would miata be over heating?
Most of the time the radiator fluid fails to complete its circuit and is probably clogged leaving it to overheat -------------- Bad thermostat Bad head gasket Cracked head Low coolant level Debris in the radiator fins Cooling system may need flushing
Is it safe to remove and keep out your thermostat in a dodge spirit Car overheats constantly and was told to remove the thermostat altogether Just want to know if this is a safe fix?
The short answer is, not really. If your thermostat is faulty, you should replace it with a new one, and if it has already been replaced, then there is another problem with your car somewhere else. Possibly a blocked radiator or a failing headgasket. The longer answer is, leaving the thermostat out entirely reduces the pressure that your cooling system operates at. This decreases the temperature at which the coolant boils and can cause bubbles of air in the coolant at the hottest places in the engine. These bubbles then act as a thermal insulator which makes those hot parts of the engine even hotter. But your temperature guage will still be showing 'normal' temperatures. If the engine runs hot in one particular area, it can damage the piston rings eventually causing the car to smoke, burn oil, and eventually cause total engine failure.
Where is the thermostat located on a 1998 GMC Jimmy V6?
follow the large hose leaving the radiator it will end at the thermostat top center front of the engine 2 bolts off it goes
