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Economical climate control system

26.06.2013

The technology, developed at Northwest National Laboratory (USA), will allow a large office building to save up to 18% of annual energy consumption, and this will not only save tens of thousands of dollars, but also make people's work more comfortable.

Such significant energy savings can be achieved thanks to just one factor: automatic registration of the number of people in the room. The engineers came up with the concept of using a simple device that adjusts the power of the ventilation/heating system depending on how many people are in the room.

This idea may seem banal, but so far such devices have not been widely used, and usually ventilation / heating systems operate with the same power, regardless of whether the room is full or empty. As a result, for example, often in large halls designed for thousands of people, several hundred people are often cold. Climate systems in large buildings, offices, train stations, hospitals, etc., almost always operate at full capacity and almost always do not coincide with the "comfort zone" of people.

To solve this problem, a team of engineers conducted a series of experiments in a large office building measuring 48x73 m with 12 floors and a basement - in total, the building area was about 46 square meters. The scientists conducted a simulation: they programmed a virtual model of the building's climate system to heat when the air temperature is below 000 degrees Celsius and cool when the temperature is above 21 degrees Celsius. In the evenings and weekends, the temperature could fluctuate in a wider corridor.

Calculations have shown that in 13 out of 15 regions of the United States, a "smart" system that estimates the number of people in the room will save at least $40 per year for each building similar to that which was modeled. At the same time, in two cities, Duluth and Fairbanks, savings exceeded $000 per year, mainly due to the reduction in the need to heat the air pumped in from the street. Even in very hot cities, El Paso and Miami, where the savings were supposed to be small, they managed to save $100 and $000, respectively.

The new technology is very promising. The fact is that trying to save on lighting is, of course, laudable and correct, but lighting consumes a tiny amount of energy compared to heating and ventilation. For example, adding a "smart" sensor that measures the number of people in a room can save up to 40% of a building's energy even with HVAC (heating, ventilation and air conditioning) systems, which are considered very advanced.

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