Room temperature

As room temperature, air temperature or indoor temperature, the temperature is referred to, which normally prevails in populated areas. It is measured at the room air.

Disambiguation room temperature - room temperature

As room temperature or internal temperature is generally referred to in the measured room temperature. Room temperature is a summary temperature variable from the local air temperature, and radiation temperatures of the individual surrounding surfaces. Air temperature is the temperature of the air surrounding the human without the action of heat radiation. It is measured at a height of 0.75 m above the floor at the workstations protected with a thermal radiation thermometer in degrees Celsius (° C) with an accuracy of ± 0.5 ° C.

Room air temperature, and room temperature is a fixed term, even if a room can have different temperatures. It is regularly to a temperature that is felt by people who reside in the space considered, as being comfortable ( comfort temperature ). It is assumed that the persons wearing a typically stay in these rooms apparel that is not designed for much higher or lower temperatures. Thermal comfort is called when air movement (no drafts ), the humidity (not too dry, too humid ) and the room temperature (not too hot or too cold) perceived as pleasant - hence the perceived temperature depends on the humidity. The target temperature of the radiating surface is dependent: the more energy is transferred to the body through radiation, the lower the air temperature needs to be to achieve a comfortable indoor climate ( radiant heating, " tiled " effect ). She is also heavily dependent on the use of space, in primary sitting unused space ( office, living room) it is higher, when moving lower ( kitchen, laundry room ), wet rooms (bathroom, toilet) demand high, dormitories low temperature (principle of night setback).

The use of the concept of the room air temperature as the reference, and reference value

Building and everyday

In air conditioning, arising from the difference between aspired room temperature (room temperature) and a certain averaging of the outside temperature all relevant variables for the heating as heating load and heat demand, heating days and heating season degree days / heating degree days and the resulting heating costs - the terms of the cooling technology when the outdoor temperature exceeds the room temperature, or the sunlight heats the building cooling load are analogous and cooling requirements, the cooling degree and Sommer-/Hitzetage hours.

The costs associated with the set room temperature values ​​are in the German-speaking countries, depending on the standard at 20 ° C ( 19-21 ° C) for residential buildings, office buildings, schools; 22 ° C (21-23 ° C) for hospitals, nursing homes, public baths; 18 ° C ( 17-19 ° C) for sites or sports; 16 ° C ( 15-17 ° C) for storage. In warm weather, the room temperature should not exceed a value of about 25 ° -26 ° C (see Hitzefrei ). For the calculation of the required heating power for living rooms, a room temperature of 20-21 ° C is used in many cases. The ideal room temperature is dependent on the function of the room. For kitchen and bedroom room temperatures of 16 ° to 18 ° C are sufficient. However, it should drop below 16 ° C in any room, the room temperature to prevent mold growth due to high humidity. The room temperature can easily be regulated and monitored by means of thermostat and timer.

Food

The room air temperature is also used in the assessment and information regarding the shelf life of foods and medicines. This information needs to be adjusted for different climate zones: For example, a food storage " at room temperature " is recommended ( for example in the indication of the durability date), so in this case a temperature range from 18 ° C to 22 ° C is assumed in Germany.

In wine, especially good red wines, is usually the recommendation to listen, cham brate this, that is, to bring to room temperature. However, this means a temperature of 17 to a maximum of 19 ° C meant, because the statement comes from times when the rooms were not heated as warm as today.

Chemical and physical systems

In physics, mostly in statistical physics, a room temperature of 293 Kelvin ( 20 degrees Celsius ) is often recognized, bringing about beating standard thermal energy yields kB · T of about 25 meV (= 4 · 10-21 J). However, this value is defined by no means unique or scientifically; one finds, for example, in U.S. textbooks mainly before a temperature of 25 ° C (77 ° F) as a reference.

On the other hand, there are also systems of standard conditions or standard conditions that have been defined by international commissions according to scientific guidelines; these are for example the STP system of IUPAC ( 273.15 K) or the standard ISO 13443 (15 ° C). Measurements for (steam) pressure or the specific weight or density, for example, liquids and chemical reaction rates based on temperature in such systems.