scholarly journals Introducing a Calculator for the Environmental and Financial Potential of Drain Water Heat Recovery in Commercial Kitchens

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3486
Author(s):  
Isabel Schestak ◽  
Jan Spriet ◽  
David Styles ◽  
A. Prysor Williams
Keyword(s):  
Energy Consumption ◽  
Financial Incentives ◽  
Heat Recovery ◽  
Service Sector ◽  
Service Providers ◽  
Food Service ◽  
Hot Water ◽  
Policy Support ◽  
Drain Water ◽  
Environmental Burdens

Food service providers like restaurants, cafes, or canteens are of economic importance worldwide, but also contribute to environmental impacts through water and energy consumption. Drain water heat recovery from commercial kitchens, using a heat exchanger, has shown large potential to decarbonise hot water use across food services, but is rarely deployed. This work translates previous findings on the technical feasibility and heat recovery potential for commercial kitchens into a publicly available calculator. It facilitates decision-making towards recovery and reuse of the freely available heat in kitchen drains by estimating both financial costs and payback time, as well as environmental burdens associated with the installation and environmental savings from avoided energy consumption. Environmental burdens and savings include, but are not limited to, carbon emissions. Further, the tool highlights key aspects of the technical implementation to understand installation requirements. The tool is freely available and could contribute to the uptake of heat recovery in the food service sector, ideally in conjunction with policy support through financial incentives or subsidies.

scholarly journals Implementation of greywater heat recovery system in hospitals

2019 ◽  
Vol 116 ◽  
pp. 00018 ◽  
Author(s):  
Edyta Dudkiewicz ◽  
Agnieszka Ludwińska ◽  
Krzysztof Rajski
Keyword(s):  
Energy Demand ◽  
Heat Recovery ◽  
Energy Analysis ◽  
Cold Water ◽  
Hot Water ◽  
Drain Water ◽  
Great Opportunity ◽  
Recovery System ◽  
Reduce Energy Consumption ◽  
The Eu

The constant demand for domestic hot water (DHW) creates great opportunity for drain water heat recovery (DWHR) systems in hospitals, so there is an enormous potential to reduce energy consumption in accordance to the EU environmental policy. This paper aims to assess the energy saving from greywater in hospitals. The energy analysis considered the type, constructions, efficiency of the proposed four types of heat exchangers (HEX). The measured data from two Polish hospitals was elaborated and calculated for two supply cold water temperatures: constant and variable. Results ensure that implementation of HEX type GFX allows to save up 30% of the energy demand.

scholarly journals Improving Energy Efficiency of Thermal Processes in Healthcare Institutions: A Review on the Latest Sustainable Energy Management Strategies

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 569
Author(s):  
Percy Andrew Hohne ◽  
Kanzumba Kusakana ◽  
Bubele Papy Numbi
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Service Sector ◽  
Energy Savings ◽  
Management Strategies ◽  
Food Service ◽  
Developed Countries ◽  
Level Energy ◽  
Conceptual Level ◽  
Patient Health

Healthcare institutions consume large amounts of energy, ranking the second highest energy-intensive buildings in the commercial sector. Within developed countries, the energy consumption of healthcare institutions may account for up to 18% of the overall energy usage in commercial sectors. Within developing countries, such as South Africa, the energy consumption of healthcare institutions is observed to be a close second to the food service sector. Energy consumption of healthcare institutions per bed typically range from 43–92 kWh per day. In this paper, the largest energy consumers in South African healthcare institutions are identified and appropriate energy-efficiency (EE) initiatives are proposed, in terms of performance, operation, equipment and technology efficiency (POET). Two main thermal energy consumers are identified as heating, ventilation and air conditioning (HVAC) and water-heating systems. These systems are critical to patient health and may be classified as non-deferrable loads. Therefore, several initiatives are suggested to improve the energy efficiency and demand-side management capability of these systems. These initiatives are subdivided into different levels: the conceptual level, active level, technical and further improvement level, as defined in the POET framework. At each level, energy-efficiency initiatives are introduced based on potential energy savings and the effort required to achieve these savings. In addition, model predictive control (MPC) approaches are discussed and reviewed as part of the further improvement section. Average possible energy savings ranged from 50%–70% at the conceptual level, while energy savings of 15%–30% may be expected for energy-efficiency initiatives at the active level. EE activities at the technical level and the further improvement level may result in savings of 50%–70% and 5%–10%, respectively.

scholarly journals Decentralized Drain Water Heat Recovery: Interaction between Wastewater and Heating Flows on a Single Residence Scale

Proceedings ◽  
2018 ◽  
Vol 2 (11) ◽  
pp. 583 ◽  
Author(s):  
Jan Spriet ◽  
Aonghus McNabola
Keyword(s):  
Heat Recovery ◽  
Ghg Emissions ◽  
Water Reservoir ◽  
Heating System ◽  
Building Energy ◽  
Hot Water ◽  
Drain Water ◽  
Consumption Data ◽  
Simulation Based ◽  
Recovery System

This paper studies the potential for drain water heat recovery on a single residence scale, showing its interaction with the space and domestic hot water heating system. The article performs a Monte Carlo simulation based on measured wastewater characteristics, and heat consumption data provided by the Building Energy Ratings database. It shows the necessity of a back-up heating system, on average between 8 and 42% of the demand can be met by recovered heat. This would signify a reduction in GHG emission varying between 7.6 and 22%, but would increase costs ranging from 120 to 130%. Using a hot water reservoir increases the share of recovered heat in the mix, reducing GHG emissions and costs. However at current traditional heating prices, the drain water heat recovery system for a single residence is not financially competitive with traditional systems, showing the need for different strategies.

scholarly journals Residential Drain Water Heat Recovery Systems: Modeling, Analysis, and Implementation

2010 ◽  
Vol 5 (3) ◽  
pp. 85-94 ◽  
Author(s):  
Scott Bartkowiak ◽  
Ryan Fisk ◽  
Andrew Funk ◽  
Jonathan Hair ◽  
Steven J Skerlos
Keyword(s):  
Heat Exchanger ◽  
Natural Gas ◽  
Flat Plate ◽  
Heat Exchangers ◽  
Heat Recovery ◽  
Cold Water ◽  
Hot Water ◽  
Published Data ◽  
Drain Water ◽  
Water Heaters

This paper describes the design and environmental improvements that can be achieved using drain water heat recovery systems (DWHR) to reduce the energy consumption associated with residential showering. DWHR systems transfer heat from hot drain water to the shower's incoming cold water stream, thus reducing the demand on the hot water heater. There are various DWHR systems available that differ in heat exchanger type, cost, and performance. This article focuses on designing a flat plate and gravity fed heat exchangers for a range of residential showering conditions. This is useful since there currently is no peer-reviewed published data on the effectiveness of DWHR, nor is there published research considering the emissions reductions that can be achieved with realistic DWHR systems. The governing equations for heat exchangers are used to model empirical data and to derive implementation recommendations for DWHR design. The model is validated using a prototype flat plate heat exchanger and test stand under varying flow rates and temperatures. A Monte Carlo simulation of the results showed that DWHR could save an average $74 a year for homes with natural gas water heaters and $160 a year for homes with electric water heaters. This corresponds to 0.3 metric tons and 1.5 metric tons of CO2offset per home per year for natural gas and electric water heaters, respectively. The results are compiled and organized into a software program that allows consumers to input their household showering habits and location to get an estimate of their CO2, energy, and cost savings to determine if they should install a DWHR system.

A NEW APPROACH TO NUMERICAL INVESTIGATION OF GFX AND POWER-PIPE DRAIN WATER HEAT RECOVERY (DWHR) SYSTEMS IN BUILDINGS

2018 ◽  
Vol 49 (14) ◽  
pp. 1339-1352 ◽  
Author(s):  
Pooria Akbarzadeh ◽  
A. Abbas Nejad ◽  
F. Movahed ◽  
S. Zolfaghari
Keyword(s):  
Numerical Investigation ◽  
Heat Recovery ◽  
Drain Water ◽  
New Approach

Saving Primary Energy Consumption Through Exergy Analysis of Combine Distillation and Power Plant

2012 ◽  
Vol 9 (2) ◽  
pp. 65
Author(s):  
Alhassan Salami Tijani ◽  
Nazri Mohammed ◽  
Werner Witt
Keyword(s):  
Energy Consumption ◽  
Power Plant ◽  
Heat Pump ◽  
Heat Recovery ◽  
Energy Savings ◽  
Primary Energy ◽  
Heat Pumps ◽  
Saturated Steam ◽  
Distillation Unit ◽  
Primary Energy Consumption

Industrial heat pumps are heat-recovery systems that allow the temperature ofwaste-heat stream to be increased to a higher, more efficient temperature. Consequently, heat pumps can improve energy efficiency in industrial processes as well as energy savings when conventional passive-heat recovery is not possible. In this paper, possible ways of saving energy in the chemical industry are considered, the objective is to reduce the primary energy (such as coal) consumption of power plant. Particularly the thermodynamic analyses ofintegrating backpressure turbine ofa power plant with distillation units have been considered. Some practical examples such as conventional distillation unit and heat pump are used as a means of reducing primary energy consumption with tangible indications of energy savings. The heat pump distillation is operated via electrical power from the power plant. The exergy efficiency ofthe primary fuel is calculated for different operating range ofthe heat pump distillation. This is then compared with a conventional distillation unit that depends on saturated steam from a power plant as the source of energy. The results obtained show that heat pump distillation is an economic way to save energy if the temperaturedifference between the overhead and the bottom is small. Based on the result, the energy saved by the application of a heat pump distillation is improved compared to conventional distillation unit.

DETERMINING THE PROFITABILITY OF GREENHOUSE ELECTROTECHNOLOGIES: A MODELING APPROACH

HortScience ◽  
1994 ◽  
Vol 29 (4) ◽  
pp. 249a-249
Author(s):  
Eric A. Lavoie ◽  
Damien de Halleux ◽  
André Gosselin ◽  
Jean-Claude Dufour
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Water System ◽  
Heat Pumps ◽  
Hot Water ◽  
Pump System ◽  
Heat Pump System ◽  
Artificial Lighting ◽  
Hot Air ◽  
Marketable Fruit

The main objective of this research was to produce a simulated model that permitted the evaluation of operating costs of commercial greenhouse tomato growers with respect to heating methods (hot air, hot water, radiant and heat pumps) and the use of artificial lighting for 1991 and 1992. This research showed that the main factors that negatively influence profitability were energy consumption during cold periods and the price of tomatoes during the summer season. The conventional hot water system consumed less energy than the heat pump system and produced marketable fruit yields similar to those from the heat pump system. The hot water system was generally more profitable in regards to energy consumption and productivity. Moreover, investment costs were less; therefore, this system gives best overall financial savings. As for radiant and hot air systems, their overall financial status falls between that of the hot water system and the heat pump. The radiant system proved to be more energy efficient that the hot air system, but the latter produced a higher marketable fruit yield over the 2-year study.

Pooling Raw Shell Eggs: Salmonella Contamination and High Risk Practices in the United Kingdom Food Service Sector

2010 ◽  
Vol 73 (3) ◽  
pp. 574-578 ◽  
Author(s):  
F. J. GORMLEY ◽  
C. L. LITTLE ◽  
N. MURPHY ◽  
E. de PINNA ◽  
J. MCLAUCHLIN
Keyword(s):  
United Kingdom ◽  
Food Safety ◽  
High Risk ◽  
Service Sector ◽  
Safety Management ◽  
Food Service ◽  
Control Measures ◽  
Hygiene Practices ◽  
Risk Practices ◽  
Handling Practices

Salmonella contamination of pooled raw shelled egg mix (RSEM) used as an ingredient in lightly cooked or uncooked foods and high-risk kitchen hygiene practices in United Kingdom food service establishments using RSEM were investigated. Samples were collected from 934 premises. Salmonella was found in 1 (0.13%) of 764 RSEM samples, 2 (0.3%) of 726 samples from surfaces where ready-to-eat foods were prepared, and 7 (1.3%) of 550 cleaning cloths. Poor RSEM storage and handling practices were highlighted. Workers in 40% of the premises sampled failed to use designated utensils when RSEM was added to other ingredients, workers in 17% of the premises did not clean surfaces and utensils thoroughly after use with RSEM and before preparing other foods, only 42% of workers washed and dried their hands after handling eggs or RSEM, workers in 41% of the premises did not store RSEM at refrigeration temperature before use, and workers in 8% of the premises added RSEM to cooked rice at the end of cooking when preparing egg fried rice. Take-away premises, especially those serving Chinese cuisine, were least likely to have a documented food safety management system and awareness of the key food safety points concerning the use of RSEM compared with other food service premises (P < 0.0001). Food service businesses using RSEM must be aware of the continuing hazard from Salmonella, must adopt appropriate control measures, and must follow advice provided by national food agencies to reduce the risk of Salmonella infection.

Low-Wage Women’s Experiences of Workplace Incivilities

2021 ◽  
pp. 193672442110147
Author(s):  
Katherine Tindell ◽  
Irene Padavic
Keyword(s):  
Customer Service ◽  
Service Sector ◽  
Food Service ◽  
Future Research ◽  
Income Loss ◽  
Service Workers ◽  
Bank Teller ◽  
Depth Interviews ◽  
Service Representative ◽  
Research And Policy

Workplace incivility, also called bullying, mobbing, and harassment, is pervasive and takes a high toll on employees. This study draws on 18 in-depth interviews with women in the precarious, low-wage, service sector in jobs such as customer service representative, retail sales, food service, pharmacy technician, and bank teller. Women service workers are a particularly vulnerable group, and yet most research on workplace problems of this type focus on professional women’s experience. We find that in this sample, most incivilities came from supervisors, followed by customers and then coworkers. Among supervisors, women were the most common perpetrators, while customer and coworker perpetrators were largely men. The type of incivility varied depending on role: Disparagement was common on the part of supervisors and customers, while coworkers were far more likely to engage in sexual harassment, which was virtually nonexistent among supervisors. Consequences for targets of these incivilities included anxiety, which most had experienced, and income loss. We offer suggestions for future research and policy.

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