The high cost of energy since the 1970s has become an important factor in promoting technical problems for the individual engineer. Innovative approaches to improving the effectiveness, which once were considered inexpedient now receive serious consideration and often economically justified. For example, regeneration of low-temperature heat through temperature increase energy levels with a heat pump (cooling system). The days of the development of the system at a low price with little or no operational costs, but now, it seems, in the past.....