Comprehensive Analysis of the State of Technology in the Field of Waste Heat Recovery from Grey Water

Piotrowska, Beata; Słyś, D.

doi:10.3390/en16010137

Cited by 11 publications

(18 citation statements)

References 56 publications

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“…All these factors influence the energy effect of introducing energy-saving measures [23]. The device under study utilizes heat only when the shower is running.…”

Section: Development Of a Methodology For Designing A Heat Exchange D...mentioning

confidence: 99%

Determination of the optimal heat exchanger configuration for wastewater heat recovery

Soloveva,

Solovev,

Kunitsky

et al. 2023

E3S Web of Conf.

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The work aims to increase the efficiency of the hot water supply system based on local recovery of the heat of wastewater generated in the shower room for preheating cold water. The work uses mathematical modeling of the thermal operation of the heat exchanger under study. Physical modeling of the heat exchange process between media flows in a heat exchanger was carried out (experimental test). Temperatures of media flows were measured. The temperature distribution inside media flows was compared experimentally with data obtained analytically. In conclusion, an analysis and generalization of the results obtained is made. The result of the research was a designed recovery heat exchanger. Data were obtained on the thermal inertia of the device, i.e., about the required time for the device to achieve a stationary thermal regime from the moment it is turned on. Data were obtained on the potential energy effect from introducing a recovery heat exchanger, taking into account its thermal inertia. The number of showers required to pay off the heat exchanger was calculated. Data were obtained on the influence of changes in the geometric and operating parameters of the heat exchanger on the efficiency of wastewater thermal energy utilization. A methodology for designing a heat exchanger for specific operating conditions was developed. The developed method for designing a recovery heat exchanger allows one to determine the optimal configuration of the device under particular operating conditions and mode of use of the heat exchanger, taking into account its thermal inertia. It is planned to continue the work by assessing the energy and economic effect of using local wastewater heat recovery within the heat supply system of a separate settlement/region.

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“…All these factors influence the energy effect of introducing energy-saving measures [23]. The device under study utilizes heat only when the shower is running.…”

Section: Development Of a Methodology For Designing A Heat Exchange D...mentioning

confidence: 99%

Determination of the optimal heat exchanger configuration for wastewater heat recovery

Soloveva,

Solovev,

Kunitsky

et al. 2023

E3S Web of Conf.

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“…The use of technology for the reuse of grey wastewater is very beneficial in economic and environmental terms [45]. Today, grey water reuse installations are mostly found in buildings with high water consumption, where the investment pays off very quickly.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Modelling Possible Household Uses of Grey Water in Poland using Property Fitting Analysis

Ober,

Karwot,

Sitinjak

2024

Resources

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One of the most important methods of optimising water consumption is grey water recycling. From a technological point of view, the treatment of grey water guarantees that it can be reused for domestic or corporate purposes, but it raises the issue of the social acceptance of the use of such water. This study aimed to assess the possibility of using grey water in households in Poland. The originality of this research study lies in the application of the PROFIT method for the separate construction of models of the benefits of grey water according to user groups. Four groups were identified, differentiated by gender and age; age and possession of an irretrievable water meter; gender and place of residence; place of residence and possession of an irretrievable water meter. To answer the formulated research questions, a diagnostic survey method was used, in which 807 randomly selected respondents from all over Poland were surveyed. The results of the survey indicate that homeowners perceive the potential use of grey water as beneficial, pointing most often to the following factors: rebuilding groundwater levels, reduced extraction of drinking water from rivers and other water bodies, and increased vegetation growth. On the other hand, they are concerned about the need to reconstruct the existing water and sewerage systems in order to produce drinking water from grey water as well as about the high cost and parameter stability of drinking water produced from grey water. Furthermore, men and older people attribute less importance to measures related to the introduction of good practices based on the reuse of recycled water in water management. Women, on the other hand, appreciate almost all opportunities to use grey water to a greater extent than men.

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“…As the second largest energy consumer in residential buildings, domestic water heating (or showering) has great potential for energy conservation [4]. Many previous studies demonstrated the possible ways to save energy during showering, such as enhancing heat pump efficiency [5], recovering heat from wastewater [6,7], using clean energy [8], etc. However, most of these studies focused on water heating or recycling techniques.…”

Section: Introductionmentioning

confidence: 99%

Wise Choice of Showerhead Patterns: How to Save Energy during Showering While Maintaining Thermal Comfort

Zhang,

Mui,

Wong

2024

Water

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Heat transfer coefficients between shower water and human skin could significantly impact occupants’ thermal sensation and energy consumption during showering. A recent study found that heat transfer coefficients varied considerably among showerhead patterns. However, the specific effects of the showering heat transfer process on the showerhead patterns have yet to be determined. Two experiments were conducted to quantify the spray patterns during showering, and the impacts of the patterns’ parameters on the heat transfer coefficient were examined using different statistical methods. Five showerheads with 18 spray patterns were tested in this study. The resistance factor, water supply pressure, and nozzle area ratio of these patterns were measured to qualify their shower performance. The results indicated that all the tested parameters significantly impacted the heat transfer coefficient in general, and using resistance factor and nozzle area ratio could accurately predict the heat transfer performance of the showerhead pattern. Additionally, this study demonstrated that changing to a showerhead with a higher heat transfer coefficient could save considerable energy while maintaining the same thermal sensation during showering. The influence of water spray patterns on the heat transfer coefficient could provide residents with scientific references when selecting showerheads in their bathrooms.

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Comprehensive Analysis of the State of Technology in the Field of Waste Heat Recovery from Grey Water

Cited by 11 publications

References 56 publications

Determination of the optimal heat exchanger configuration for wastewater heat recovery

Determination of the optimal heat exchanger configuration for wastewater heat recovery

Modelling Possible Household Uses of Grey Water in Poland using Property Fitting Analysis

Wise Choice of Showerhead Patterns: How to Save Energy during Showering While Maintaining Thermal Comfort

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