Rainwater potential use in dormitory building: drinking water savings and economic costs

• Autorzy: Stec A. , Słyś D.

Identyfikatory

DOI

10.2428/ecea.2017.24(1)4

Warianty tytułu

PL

Możliwości wykorzystania wody deszczowej w domu studenckim: oszczędność wody pitnej i korzyści finansowe

• Języki publikacji: EN

Abstrakty

EN

Climate change, improper use of water resources, surface waters pollution as well as increase of water requirements are the results of growing population of people in the world. It causes that the most countries, including Poland, are faced with the deficit of water. Because of this a variety of measures are taken continuously in order to reduce the depletion of the global water resources, eg using rainwater in toilet flushing, car washing, washing machines, irrigation of arable land or watering green areas. The use of this type of solutions may also decrease fees charged for water supply to buildings which often constitute a substantial part of their upkeep expenses. In this paper, the financial effectiveness of the use of the rainwater harvesting system (RWHS) for toilet flushing is presented. The analysis was conducted using a simulation model and as a subject of study a dwelling-house (a dormitory) located in Poland was chosen. The study also analyzed the influence of a retention tank size on efficiency of the economic use of rainwater utilization system for the dormitory. In the financial analysis two financial ratios were determined: the Net Present Value (NPV) and the Discounted Payback Period (DPP), and sensitivity studies were conducted as well. The conducted analysis demonstrated that the use of the RWHS system in the analyzed building is cost-effective and that it may reduce water requirement for toilet flushing by 11 to 22%, depending on the capacity of the retention tank.

PL

W pracy przedstawiono wyniki badań określające efektywność finansową systemu wykorzystania wody deszczowej (RWHS) do spłukiwania toalet. Jako przedmiot badań wybrano budynek mieszkalny (akademik) zlokalizowany w Polsce. Analizę funkcjonowania systemu RWHS przeprowadzono na sformułowanym modelu symulacyjnym. W badaniach przeanalizowano również wpływ wielkości zbiornika retencyjnego na efektywność finansową zastosowania systemu gospodarczego wykorzystania wody deszczowej w rozpatrywanym domu studenckim. W analizie finansowej zostały określone dwa wskaźniki finansowe: wartość bieżąca netto (NPV) oraz zdyskontowany okres zwrotu (DPP). W celu oceny ryzyka inwestycyjnego związanego z zastosowaniem systemu gospodarczego wykorzystania wody deszczowej w badanym akademiku wykonano analizę wrażliwości inwestycji. W tym celu wyznaczono współczynniki wrażliwości inwestycji sc, które obrazuj ą, jak duży wpływ na otrzymaną wartość NPV wywiera zmiana wartości poszczególnych zmiennych niezależnych o 1%. Przeprowadzona analiza wykazała, że zastosowanie układu RWHS w analizowanym budynku jest opłacalne i może zmniejszyć zapotrzebowanie na wodę do spłukiwania toalet od 11 do 22%, w zależności od pojemności zbiornika retencyjnego.

Słowa kluczowe

EN

rainwater harvesting systems; rainwater management; drinking water savings; financial analysis

PL

system wykorzystania wody deszczowej; zarządzanie wodą deszczową; oszczędność wody pitnej; analiza finansowa

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Ecological Chemistry and Engineering. A
• Rocznik: 2017
• Tom: Vol. 24, nr 1
• Strony: 43--64
• Opis fizyczny: Bibliogr. 43 poz., wykr., tab., rys.

Twórcy

autor

Stec A.

• Department of Infrastructure and Water Management, Faculty of Civil, Environmental Engineering and Architecture, Rzeszow University of Technology, al. Powstańców Warszawy 12, 35–959 Rzeszów, Poland, phone: [phone], fax: [phone].

autor

Słyś D.

• Department of Infrastructure and Water Management, Faculty of Civil, Environmental Engineering and Architecture, Rzeszow University of Technology, al. Powstańców Warszawy 12, 35–959 Rzeszów, Poland, phone: [phone], fax: [phone].

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).