Swiss engineers have proposed integrating a system for removing excess heat that they have developed into the metro tunnels currently under construction in Lausanne. It is no secret that the subway is constantly overheating due to train movements, the operation of many mechanisms, and the presence of a huge mass of people. Previously, the task of analyzing all this heat release was considered too difficult, but now a model has been created that will allow the use of thermal energy to the advantage.
The idea is quite simple - instead of spending energy on powerful ventilation and air conditioning in the metro, they immediately remove excess heat from the tunnels outside. All you need is to lay pipes with a coolant in the walls of structures, at least with ordinary water. It will receive heat from the heated air in the tunnels and carry it wherever it is needed. In this case, directly to the surface, to nearby buildings.
In winter, cold water is pumped underground, which is passively heated to a level where it can be supplied to the heating radiators of residential premises. In summer, on the contrary, using a similar system, you can remove excess heat from buildings and dissipate it in the earth. Swiss engineers have calculated that in the case of the projected metro in Lausanne, it is possible to build a system that will take heat from 60, 000 square meters. surface area of tunnels and heat it for 1500 apartments up to 80 sq.m. each one.
The main advantage of this technology for the city is total energy saving. And on the heating of housing, and on the ventilation of the subway, and on the cooling of communications in the summer, and at the work of air purification systems. It is estimated that eliminating gas heating will reduce CO 2 emissions by 2 million tonnes per year. At the same time, construction will not require large costs, the service life of the entire system will be about 100 years, and the most vulnerable point is heat pumps, which will have to be replaced every 20 years, not more often.