An experimental analysis of the impact of temperature on falling film drain water heat recovery system effectiveness

Manouchehri, Ramin; Collins, Michael R.

doi:10.1016/j.enbuild.2016.08.031

Cited by 20 publications

(5 citation statements)

References 2 publications

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“…Previous work showed that variations in the inlet temperatures had an impact on the measured effectiveness for DWHR systems [20]. A theoretical analysis of heat transfer in DWHR systems was also conducted and successfully used to predict the impact of inlet temperatures on system effectiveness [24].…”

Section: Temperature Adjustment Of the Equal Flow Effectiveness Curvementioning

confidence: 99%

“…where ε is the equal flow effectiveness at a set of known inlet temperatures, ε re f is the equal flow effectiveness determined at a set of inlet reference temperatures, and F C is the correction factor. All temperatures are in • C. The reference temperatures were chosen to be T h,i = 40 • C and T c,i = 10 • C. More details about the development of Equation ( 4) can be found in previous publications [20,24].…”

Section: Temperature Adjustment Of the Equal Flow Effectiveness Curvementioning

confidence: 99%

“…Significant efforts have been made to address this issue at the University of Waterloo through a series of studies. The first study aimed to develop the characteristic effectiveness vs. flow rate curves for multiple DWHR systems [17], while others investigated the impacts of drain-side wetting [18], off-vertical system installation [19], variable inlet temperatures [20] and unequal flowrates [21]. The results from these studies were combined into a preliminary model capable of predicting the steady-state performance of DWHR systems using data obtained from the CSA's rating process, which was presented at a conference in 2016 [22].…”

Section: Introductionmentioning

confidence: 99%

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Modelling the Steady-State Performance of Coiled Falling-Film Drain Water Heat Recovery Systems Using Rated Data

Manouchehri

Collins

2020

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Falling-film drain water heat recovery (DWHR) systems are heat exchangers used to recover energy from warm water travelling down vertical drainpipes. DWHR systems are rated at constant inlet temperatures at multiple flow rates while maintaining an equal flow rate through both sides of the heat exchanger. The outcome of the rating system is an effectiveness value that is the main metric used to sell DWHR systems to the public. Unfortunately, the rated conditions may not be representative of what occurs during operation in a typical house. The present work aims to bridge this gap by presenting several semi-empirical correlations that are combined into a model capable of predicting the steady-state performance of a DWHR system at variable temperatures and flow rates, based on data generated during the rating process. This model is then validated experimentally for eight different DWHR systems for a total of 135 validation cases. The results show that the model is very effective at estimating the performance of DWHR systems for validation cases, and the mean absolute percentage error for the model predictions versus the experimental results is less than 3%.

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Section: Temperature Adjustment Of the Equal Flow Effectiveness Curvementioning

confidence: 99%

Section: Temperature Adjustment Of the Equal Flow Effectiveness Curvementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling the Steady-State Performance of Coiled Falling-Film Drain Water Heat Recovery Systems Using Rated Data

Manouchehri

Collins

2020

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“…Hassani et al [15] studied the performance of mass transfer models for heat transfer coefficient, film thickness, bubble generation and liquid super-heating. Manouchehri et al [16] showed that heat exchanger effectiveness is linked to fluid inlet temperatures, and that increases in either of these temperatures would lead to an increase in effectiveness. Moreover, in previous studies [17,18] , it was reported that the oil content in the wastewater had a critical effect on fluid physical properties and the flow and heat transfer characteristics of spray falling.…”

Section: Introductuonmentioning

confidence: 99%

An Experimental study on Flow and Heat Transfer Characteristics of Oily Water Falling Film on Horizontal Tubes

Zhihao¹,

He²,

Lin³

et al. 2021

Preprint

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In order to study the falling film flow process outside the horizontal circular tube, experiment is adopted in this paper to investigate the effects of liquid spray density and spray temperature on the liquid film flow pattern transformation and pattern distribution. Meanwhile, the temperature distribution characteristics of the horizontal tubes are analyzed. The high-speed camera was used to photograph the flow pattern of the liquid film, and the K-type thermocouples were used to measure the tubes wall temperature. The results show that (1) as the spray density increases, the liquid film is converted from a droplet flow to a columnar flow and then to a sheet flow; (2) the critical spray density of the flow pattern conversion will reduce with the spray liquid temperature increasing; (3) the critical spray density of 10% glycerol solution for flow pattern conversion is bigger than that of water; (4) the tube wall circumferential temperature increased with the increase of spray density, and the tubes wall circumferential temperature decreased with the increase of the circumferential angle in the range of the circumferential angle from 0° to 135° and rose slightly from 135° to 180°; (5) the tube wall circumferential temperature of water is higher than that of the 10% glycerol solution.

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“…Hence the activities in the field of replacing low-efficient heating boilers with modern energy-saving devices, and the modernization of the installation allowing for the maximization of work efficiency or the integration of various installation systems [3][4][5]. Another way to reduce the energy consumption in a building can also be an investment in renewable energy sources [6,7], including the installation of DWHR (Drain Water Heat Recovery) enabling the recovery of waste heat from sewage systems [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

An assessment of the financial efficiency of a heat recovery system from graywater in a hotel

Mazur

2018

E3S Web Conf.

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The purpose of the article is to determine the profitability of investing in a graywater heat recovery system in a hotel facility located in south-eastern Poland whichis dependent on three heat sources for the domestic hot water preparation system, i.e. gas boiler, biomass boiler and electric heater. There were also various options for accommodation use: 25%, 50%, 75% and 100% occupancy of the hotel. The research was focused on the most frequently used methods for the absolute assessment of the effectiveness of investment projects enabling the creation of an objective criterion. Thus, both the simple method - Simple Pay Back Period SPBP and dynamic methods based on the discount account were used in calculations: Net Present Value NPV, Internal Rate of Return IRR, Profitability Index PI, Discounted Pay Back Period DPBP. The analysis also includes the annual increase in the purchase price of energy carriers. The conducted research has shown that in most cases the installation of the DWHR (Drain Water Heat Recovery) system is beneficial and profitable to the investor.

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An experimental analysis of the impact of temperature on falling film drain water heat recovery system effectiveness

Cited by 20 publications

References 2 publications

Modelling the Steady-State Performance of Coiled Falling-Film Drain Water Heat Recovery Systems Using Rated Data

Modelling the Steady-State Performance of Coiled Falling-Film Drain Water Heat Recovery Systems Using Rated Data

An Experimental study on Flow and Heat Transfer Characteristics of Oily Water Falling Film on Horizontal Tubes

An assessment of the financial efficiency of a heat recovery system from graywater in a hotel

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