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Strategies for reduction of energy consumption during ascending and descending process of modern telescopic HAPS aerostats

Knap L., Graczykowski C., Holnicki-Szulc J., Wołejsza Z.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2020

Vol. 68, nr 1

155--168

In this article, the authors propose and investigate a new concept of HAPS aerostat design in a modular form, which allows for sequential increasing or decreasing of the total volume, up to the desired size. In its initial form, the aerostat has relatively small dimensions but its central cylindrical part is multi-segmented and can be easily extended. The application of controllable construction couplings enables precise control of the aerostat expansion process and significantly improves its vertical mobility. The paper describes details of telescopic aerostat construction, presents a mathematical model of its vertical motion and investigates numerically two volume control strategies aimed at maximization of operation efficiency and minimization of operation cost. The results obtained reveal the main problems that have to be addressed and the factors that play a key role in design of such telescopic aerostats and control of their vertical mobility.

Heating ventilation and air conditioning system; enhancement of energy consumption via control optimisation

Zajic I., Burnham K. J., Larkowski T., Hill D.

Systems Science

2010

Vol. 36, no 3

39-47

Nowadays, because of higher energy costs and the awareness of the environmental issues a general trend can be observed to increase the energy efficiency of heating ventilation and air conditioning (HVAC) systems. The paper demonstrates that this aim can be achieved by highly stable control allowing for operation close to the specification limits, where the highest profitability can be obtained. In this regard, black-box models of both the controlled zone air temperature and humidity are constructed for a subsequent analysis of the present control system via a computer simulation. The results obtained are utilised for tuning of controllers on a real plant leading, subsequently, to substantial energy savings. The paper also investigates a potential scope for further energy savings.