The human body is cooled by the medium in which it is present, i.e. the air. This can take place in a pleasant or unpleasant manner. It is pleasant (read: comfortable) when the temperature of this medium is not perceived as either cold or warm. To achieve this, a comfort-loving person installs heating which is used in the cold periods of the year and air conditioning working in the summer or all year round. The task of central heating is, in most cases, maintaining such temperature of the air, which feels nice (read:comfortable)
Humans with their heat overproduction in vital organs must be cooled, in order to maintain optimum temperature for their operation (for the enzyme systems, there is a so-called temperature optimum, i.e. the temperature at which the number of revolutions of coenzymes in the cycles is greatest – at a slightly greater or lower temperature the number of revolutions decreases). Thus, thermoregulatory mechanisms of the body are set to maintain the proper temperature of the blood returning to the organs (which determines the temperature inside the organs, as well as the blood flow rate through the organ), and particularly to the control centre – the brain.
While presence at a temperature somewhat lower than pleasant is not a problem for the body (flow in the circuit decreases), whereas functioning in a temperature above pleasant (read: comfortable) is more difficult. The body must cool the organs with heat overproduction at all costs, by moving the heat to the circuit and removing it.
The simplest mechanism for the body is to regulate the flow in the lower extremities, as it takes place with a slight change of the parameter of total vascular resistance. If the temperature in this area is too high (decrease of the dT between the skin surface and the medium i.e. the air), as a result of intensive work of the heat source or putting on too warm clothes, the body must resort to further measures to help it to remove the excess heat from internal organs. The next method is to shift the maximum amount of blood to the circuit, including the skin (sharp increase in the vascular resistance due to enlargement of the vascular bed). This requires an increase in diastolic blood pressure, increase in heart rate and stroke (minute) volume increase of the heart. Acceleration and deepening of the breath must also take place – not always facilitated due to the position of the body at a given moment, and due to its fatness. Such excessive involvement of the cardiovascular system, along with the lowered pulmonary ventilation, may result in, among other things, oxygen debt at the tissue level unfavourable for optimal mental work. Moving large amounts of blood to the circuit means less blood in the internal organs and impairing their metabolism. Such committed work that supports the process of cooling of the internal organs is no longer relaxing for the body…
Thus, central heating should be used for making the temperature of the common medium for which it is cooled, and in which humans are also present, cooling their key vital organs, pleasant (read: comfortable).
Central heating is used for comfortable cooling of the body.