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The growing interest in the use of unconventional energy sources is a stimulus for the development of dedicated devices and technologies. Drain water heat recovery (DWHR) units can be an example of such devices. They allow the recovery of part of the heat energy deposited in grey water. This paper describes the results of research on the assessment of the financial profitability of the use of two horizontal heat exchanger solutions, taking into account the actual distribution of cold water temperature during the operating year in the plumbing and two operating regimes of the premises as the residential and service facilities. The analysis showed that the use of a horizontal heat exchanger with increased efficiency in a dwelling in a 15-year life cycle allowed for achieving more than twice as much savings (reaching up to EUR 1427) compared to a classic horizontal heat exchanger. At the same time, it was shown that the installation of this type of equipment was more profitable the greater the water consumption of the premises. The article also notes the impact of cold water temperature in the installation on the results of the analysis. It was featured that taking temperature on the basis of installation design recommendations led to significant distortions in the financial analysis. On the other hand, comparing the method of averaging the cold water temperature (daily, monthly and yearly), it was determined that averaging the temperature over the annual cycle was an acceptable simplification of the model. The research results presented in the paper have a practical aspect and may constitute guidelines for designers and potential investors. In addition, they can be an incentive to continue research on heat exchangers by other scientific centers, which on a global scale will increase the universality of their use.
Kamil Pochwat; Sabina Kordana-Obuch; Mariusz Starzec; Beata Piotrowska. Financial Analysis of the Use of Two Horizontal Drain Water Heat Recovery Units. Energies 2020, 13, 4113 .
AMA StyleKamil Pochwat, Sabina Kordana-Obuch, Mariusz Starzec, Beata Piotrowska. Financial Analysis of the Use of Two Horizontal Drain Water Heat Recovery Units. Energies. 2020; 13 (16):4113.
Chicago/Turabian StyleKamil Pochwat; Sabina Kordana-Obuch; Mariusz Starzec; Beata Piotrowska. 2020. "Financial Analysis of the Use of Two Horizontal Drain Water Heat Recovery Units." Energies 13, no. 16: 4113.
The need for efficient use of energy and sustainable energy management and the fact that large quantities of heat are deposited in the discharged sewage have contributed to the development of research on waste heat recovery. Gray water began to be seen not just as waste, but also as an alternative source of energy. Research related to the development, improvement, and finally, the popularization of waste energy recovery devices and systems has evolved rapidly over the last two decades. Initially, technologies for gray water reuse were not widely used, which was due to the low efficiency of the current heat exchangers and the significant investment outlays that would have to be covered by potential users. Research conducted by scientists from around the world has allowed us to eliminate construction flaws, improve efficiency, and also provide information on the selection of optimal waste heat recovery technology, depending on the installation conditions and operating parameters. The ability to correctly select the device allows for effective energy collection from gray water, which improves the investment profitability. This paper reviews the research regarding issues related to waste heat recovery from gray water in sewage installations and systems. A critical analysis of the current state of knowledge was carried out with a special consideration to the technologies intended for the residential buildings.
Beata Piotrowska; Daniel Słyś; Sabina Kordana-Obuch; Kamil Pochwat. Critical Analysis of the Current State of Knowledge in the Field of Waste Heat Recovery in Sewage Systems. Resources 2020, 9, 72 .
AMA StyleBeata Piotrowska, Daniel Słyś, Sabina Kordana-Obuch, Kamil Pochwat. Critical Analysis of the Current State of Knowledge in the Field of Waste Heat Recovery in Sewage Systems. Resources. 2020; 9 (6):72.
Chicago/Turabian StyleBeata Piotrowska; Daniel Słyś; Sabina Kordana-Obuch; Kamil Pochwat. 2020. "Critical Analysis of the Current State of Knowledge in the Field of Waste Heat Recovery in Sewage Systems." Resources 9, no. 6: 72.