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Journal articles on the topic 'Domestic hot water (DHW) validation'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Aguilar-Valero, Francisco Javier, Damián Crespí-Llorens, and Pedro Vicente-Quiles. "One-Dimensional Model of a Compact DHW Heat Pump with Experimental Validation." Energies 14, no. 11 (2021): 2991. https://doi.org/10.3390/en14112991.

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The current work presents a computationally cost-effective numerical model that successfully simulates a heat pump water heater (HPWH) under typical working conditions of dwellings. The model’s main components are a stratified tank and the heat-pump unit. Both systems are coupled, since a good prediction of water temperature is needed to accurately predict the heat-pump performance. Ten thermocouples measured the tank wall temperature. Measurements and simulations were performed under challenging conditions of a heavy stratification. The 190 L tank stratification was successfully modeled

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2

Leiria, Daniel, Hicham Johra, Evangelos Belias, et al. "Validation of a new method to estimate energy use for space heating and hot water production from low-resolution heat meter data." E3S Web of Conferences 362 (2022): 10001. http://dx.doi.org/10.1051/e3sconf/202236210001.

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One of the initiatives to reach the European decarbonization goal is the roll-out of smart heating meters in the building stock. However, these meters often record the total energy usage with only hourly resolution, without distinguishing between space heating (SH) and domestic hot water (DHW) production. To tackle this limitation, this paper presents the validation of a new methodology to estimate the SH and DHW from total measurements in different building types in three countries (Denmark, Switzerland, and Italy). The method employs a combined smoothing algorithm with a support vector regre

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3

Fadnes, F. S., R. Banihabib, and M. Assadi. "Artificial neural network model for predicting CO₂ heat pump behaviour in domestic hot water and space heating systems." IOP Conference Series: Materials Science and Engineering 1294, no. 1 (2023): 012054. http://dx.doi.org/10.1088/1757-899x/1294/1/012054.

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Abstract The natural refrigerant, CO2, possesses thermophysical properties that make it highly suitable for domestic hot water (DHW) production using heat pump technology. In this study, the development and validation of an artificial neural network (ANN) model that enables efficient design and control of a CO2 heat pump is presented. The study employs experimental data from a CO2 heat pump with a nominal heat capacity of 8 kW. The fully instrumented rig includes the heat pump and a pump rig designed to generate system temperatures representative of various space heat and DHW demands. A compre

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4

Hedegaard, Rasmus Elbæk, Martin Heine Kristensen, and Steffen Petersen. "Experimental validation of a model-based method for separating the space heating and domestic hot water components from smart-meter consumption data." E3S Web of Conferences 172 (2020): 12001. http://dx.doi.org/10.1051/e3sconf/202017212001.

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Smart meters are currently being rolled out in European district heating (DH) systems at a large scale to enable time-varying district heating tariffs and improve consumer awareness about their own consumption. Smart-meter data can also be used in more advanced applications, e.g. for establishing model-based control schemes for demand response purposes and data-driven building energy performance labeling schemes. Many of these applications require separate measurements of the consumption for space heating (SH) and preparation of domestic hot water (DHW); however, smart meters often only provid

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Bayle, Raphaël, Marina Reyboz, Aurore Lomet, Victor Cook, and Martial Mermillod. "Continuously Learning Prediction Models for Smart Domestic Hot Water Management." Energies 17, no. 18 (2024): 4734. http://dx.doi.org/10.3390/en17184734.

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Domestic hot water (DHW) consumption represents a significant portion of household energy usage, prompting the exploration of smart heat pump technology to efficiently meet DHW demands while minimizing energy waste. This paper proposes an innovative investigation of models using deep learning and continual learning algorithms to personalize DHW predictions of household occupants’ behavior. Such models, alongside a control system that decides when to heat, enable the development of a heat-pumped-based smart DHW production system, which can heat water only when needed and avoid energy loss due t

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6

Yoo, Mooyoung. "Development of Energy Efficient Domestic Hot Water Loop System Integrated with a Chilled Water Plant in Commercial Building." Sustainability 17, no. 1 (2024): 75. https://doi.org/10.3390/su17010075.

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This study investigates a novel approach to reduce energy consumption in large commercial buildings by recovering waste heat from the condenser of a chiller and utilizing it to preheat domestic hot water (DHW). While numerous energy-saving strategies have been developed for building heating and cooling systems, the energy efficiency of DHW systems has lagged behind due to the increasing demand for hot water driven by improving living standards and hygiene concerns. By integrating a heat exchanger between the chiller and the DHW system, the proposed system effectively improves the chiller’s per

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7

Sørensen, Åse Lekang, Harald Taxt Walnum, Igor Sartori, and Inger Andresen. "Energy flexibility potential of domestic hot water systems in apartment buildings." E3S Web of Conferences 246 (2021): 11005. http://dx.doi.org/10.1051/e3sconf/202124611005.

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Domestic Hot Water (DHW) storage tanks are identified as a main source of flexible energy use in buildings. As a basis for energy management in apartment buildings, this paper describes the aggregated DHW use in a case building, and analyses the potential for DHW energy flexibility by simulating different control options. The case study for the work is an apartment building in Oslo with 56 apartments and a shared DHW system. Energy measurements are available for consumed hot water, hot water circulation, and energy supplied to the DHW tanks. The measurements are presented with minute, hourly a

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8

Lidberg, Tina, Thomas Olofsson, and Louise Ödlund. "Impact of Domestic Hot Water Systems on District Heating Temperatures." Energies 12, no. 24 (2019): 4694. http://dx.doi.org/10.3390/en12244694.

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When buildings become more energy effective, the temperature levels of district heating systems need to be lower to decrease the losses from the distribution system and to keep district heating a competitive alternative on the heating market. For this reason, buildings that are refurbished need to be adapted to suit low-temperature district heating. The aim of this paper is to examine whether four different energy refurbishment packages (ERPs) can be used for lowering the temperature need of a multi-family buildings space heating and domestic hot water (DHW) system as well as to analyse the im

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9

Dudkiewicz, Edyta, and Natalia Fidorów-Kaprawy. "Hybrid Domestic Hot Water System Performance in Industrial Hall." Resources 9, no. 6 (2020): 65. http://dx.doi.org/10.3390/resources9060065.

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The renewable and waste heat sources implemented for the preparation of domestic hot water (DHW) allow for energy conservation and environment protection along with resource savings and economic benefits. The solutions, including non-conventional sources, are especially demanded in large halls in which energy and water consumption are crucial for maintenance costs. In this article, energy analysis of a DHW preparation system for workers’ hygienic purposes in a industrial hall was performed. The DHW preparation system consisted of three sources: a flue gases heat exchanger as the waste heat sou

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10

Avila Carraznza, Juan Andres, Carlos Mario Rocha, and Juan Sebastian Solis Chavez. "Domestic Hot Water Consumption Profiles Applied to a Flat Tubular Collector for Solar Water Heating in Bogotá." TECCIENCIA 16, no. 30 (2020): 29–52. http://dx.doi.org/10.18180/tecciencia.2020.31.3.

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The use of Flat Solar Collectors for the generation of Domestic Hot Water (DHW), facilitates access to this resource in an efficient, economical and sustainable way. The Sustainable Development Goals proposed by the UN, referring specifically to sustainable water management and access to renewable energy, are the main motivation for this work, since the former is an essential vital resource and its access reduces the inequality index, in developing countries such as Colombia, while the use of solar thermal energy reduces the environmental impact of the water heating process, thus reducing the

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Ávila Carranza, Juan Andrés, Carlos Mario Rocha-Osorio, and Juan Sebastián Solís-Chave. "Domestic Hot Water Consumption Profiles Applied to a Flat Tubular Collector for Solar Water Heating in Bogotá." TECCIENCIA 16, no. 31 (2021): 29–52. http://dx.doi.org/10.18180/tecciencia.2021.31.3.

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The use of Flat Solar Collectors for the generation of Domestic Hot Water (DHW), facilitates access to this resource in an efficient, economical and sustainable way. The Sustainable Development Goals proposed by the UN, referring specifically to sustainable water management and access to renewable energy, are the main motivation for this work, since the former is an essential vital resource and its access reduces the inequality index, in developing countries such as Colombia, while the use of solar thermal energy reduces the environmental impact of the water heating process, thus reducing the

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12

Hamburg, Anti, Alo Mikola, Tuule-Mall Parts, and Targo Kalamees. "Heat Loss Due to Domestic Hot Water Pipes." Energies 14, no. 20 (2021): 6446. http://dx.doi.org/10.3390/en14206446.

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Domestic hot water (DHW) system energy losses are an important part of energy consumption in newly built or in reconstructed apartment buildings. To reach nZEB or low energy building targets (renovation cases) we should take these losses into account during the design phase. These losses depend on room and water temperature, insulation and length of pipes and water circulation strategy. The target of our study is to develop a method which can be used in the early stages of design in primary energy calculations. We are also interested in how much of these losses cannot be utilised as internal h

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13

Malec, Agnieszka, Tomasz Cholewa, and Alicja Siuta-Olcha. "Influence of Cold Water Inlets and Obstacles on the Energy Efficiency of the Hot Water Production Process in a Hot Water Storage Tank." Energies 14, no. 20 (2021): 6509. http://dx.doi.org/10.3390/en14206509.

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Domestic hot water preparation is one of the main sources of energy consumption in households. One of the most important elements of domestic hot water (DHW) preparation installation is the storage tank. Its design can significantly affect the efficiency of the system and energy consumption for hot water preparation. This paper presents the results of an experimental study to examine seven different designs of the cold water inlet to the storage tank and the use of two types of obstacles inside this tank placed at three different heights. The number of stratification and the energy efficiency

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14

Montet, Frédéric, Lorenz Rychener, Alessandro Pongelli, Jean Hennebert, and Jean-Philippe Bacher. "Prediction of Domestic Hot Water Temperature in a District Heating Network." Journal of Physics: Conference Series 2042, no. 1 (2021): 012026. http://dx.doi.org/10.1088/1742-6596/2042/1/012026.

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Abstract With the fourth generation of district heating networks in sight, opportunities are rising for better services and optimized planning of energy production. Indeed, the more intensive data collection is expected to allow for load prediction, customer profiling, etc. In this context, our work aims at a better understanding of customer profiles from the captured data. Given the variety of households, such profiles are difficult to capture. This study explores the possibility to predict domestic hot water (DHW) usage. Such prediction is made challenging due to the presence of two componen

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15

Ratajczak, Katarzyna, Katarzyna Michalak, Michał Narojczyk, and Łukasz Amanowicz. "Real Domestic Hot Water Consumption in Residential Buildings and Its Impact on Buildings’ Energy Performance—Case Study in Poland." Energies 14, no. 16 (2021): 5010. http://dx.doi.org/10.3390/en14165010.

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A building’s energy consumption is assessed considering the energy required for heating, cooling, lighting, and domestic hot water (DHW). Methodologies used to calculate energy certificates in European Union countries consider hot water consumption rates per person or per heated (floor) area, giving wide-ranging values (35–88 dm3/person/day). Using extreme parameters, it is possible to obtain a primary energy index that meets the legal requirements, although unrealistically large proportions of domestic hot water use relative to the total energy balance of the building may marginalize the infl

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16

Gużda, Arkadiusz, and Norbert Szmolke. "Analysis of Domestic Hot Water Production Efficiency for Detached Houses." Applied Mechanics and Materials 797 (November 2015): 185–91. http://dx.doi.org/10.4028/www.scientific.net/amm.797.185.

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The article compares two means for domestic hot water production (DHW) for a detached house that is using gas boiler with a closed combustion chamber and air source heat pump water heater (ASHPWH). An analysis of domestic hot water production using an air source heat pump was made taking into account coefficient of performance listed according to the new BS EN 16147 standard. The analysis of outlay related to the investment and operating costs was also performed. Ultimately, the more profitable choice for domestic hot water production was made.

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17

Zhang, Xinwen, Sang Yeop Kim, Jong Ho Park, et al. "Experimental investigation on the thermal performance of a domestic gas boiler for space heating with different heating load ratio." E3S Web of Conferences 396 (2023): 03017. http://dx.doi.org/10.1051/e3sconf/202339603017.

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This study explores the effects of heating demand and hot water temperature on energy efficiency in a domestic gas boiler (DGB). Mock-up experiments were conducted using two types of boilers with different capacities (i.e., 11.6 kW and 23.3 kW of non-condensing boilers, 16.3 kW of condensing boiler) for comparative analysis. As results, for space heating, the efficiencies of non-condensing boilers (i.e., 11.6 kW and 23.3 kW) and condensing boiler (i.e., 16.3 kW) decreased by 12-44%, 15-46%, and 2-22% respectively as the heating load ratios were changed from 100%-25%. When the supply hot water

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18

Leiria, D., M. Schaffer, H. Johra, A. Marzsal-Pomianowska, and M. Z. Pomianowski. "Estimating residential space heating and domestic hot water from truncated smart heat data." Journal of Physics: Conference Series 2600, no. 2 (2023): 022017. http://dx.doi.org/10.1088/1742-6596/2600/2/022017.

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Abstract The EU aims to digitize the building stock across all member states to better understand energy use and achieve energy efficiency goals to address climate change. Smart heat meters are currently used for billing purposes in district heating (DH) grids. Their data is recorded as integer kWh values, which restricts usability for the modeling and analysis of DH networks. Previous research devised a methodology to estimate space heating (SH) and domestic hot water (DHW) energy from total heating data, but the data truncation process reduced accuracy. This study integrates the SPMS (Smooth

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19

Ahmed, Kaiser, Jevgeni Fadejev, and Jarek Kurnitski. "Modeling an Alternate Operational Ground Source Heat Pump for Combined Space Heating and Domestic Hot Water Power Sizing." Energies 12, no. 11 (2019): 2120. http://dx.doi.org/10.3390/en12112120.

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This study developed an alternate operational control system for ground source heat pumps (GSHP), which was applied to determine combined space heating and domestic hot water (DHW) power equations at design temperature. A domestic GSHP with an alternate control system was implemented in a whole building simulation model following the heat deficiency for space heating based on degree minute counting. A simulated GSHP system with 200 L storage tank resulted in 13%–26% power reduction compared to the calculation of the same system with existing European standards, which required separate space he

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20

Díaz Pérez, Francisco, Ricardo Díaz Martín, Francisco Pérez Trujillo, Moises Díaz, and Adib Mouhaffel. "Consumption and Emissions Analysis in Domestic Hot Water Hotels. Case Study: Canary Islands." Sustainability 11, no. 3 (2019): 599. http://dx.doi.org/10.3390/su11030599.

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We analyze the energy consumption of domestic hot water (DHW) in the hotels of the archipelago of the Canary Islands (Spain). Currently, systems use fossil fuels of propane and gas oil. However, this paper analyzes several alternative systems which focus on renewable and mixed energies, such as biomass, solar thermal and heat pumps systems associated with an electric generation with photovoltaic solar panels for self-consumption. The carbon footprint generated is calculated for each method of generation of DHW. In our analysis, we demonstrate that by using a high-temperature heat pump with an

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21

Sebarchievici, Calin. "Performance assessment between a ground coupled and air source heat pump used for domestic hot water preparation." E3S Web of Conferences 111 (2019): 06075. http://dx.doi.org/10.1051/e3sconf/201911106075.

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A ground-coupled heat pump system (GCHP) and an air source heat pump (ASHP) driven by photovoltaic panels are used to provide domestic hot preparation for a NZEB house. The experimental measurements are used to test both the heat pump models in the same conditions of water temperature and volume of domestic hot water. A comparative analysis of the two heat pumps for domestic hot water preparation is performed. In addition, using the software TRNSYS (Transient Systems Simulation), two numerical simulation models of thermal and electrical energy consumption in DHW mode are developed. Finally, th

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22

Benakopoulos, Theofanis, William Vergo, Michele Tunzi, Robbe Salenbien, and Svend Svendsen. "Overview of Solutions for the Low-Temperature Operation of Domestic Hot-Water Systems with a Circulation Loop." Energies 14, no. 11 (2021): 3350. http://dx.doi.org/10.3390/en14113350.

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The operation of typical domestic hot water (DHW) systems with a storage tank and circulation loop, according to the regulations for hygiene and comfort, results in a significant heat demand at high operating temperatures that leads to high return temperatures to the district heating system. This article presents the potential for the low-temperature operation of new DHW solutions based on energy balance calculations and some tests in real buildings. The main results are three recommended solutions depending on combinations of the following three criteria: district heating supply temperature,

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23

Amanowicz, Łukasz. "Peak Power of Heat Source for Domestic Hot Water Preparation (DHW) for Residential Estate in Poland as a Representative Case Study for the Climate of Central Europe." Energies 14, no. 23 (2021): 8047. http://dx.doi.org/10.3390/en14238047.

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Due to the energy transformation in buildings, the proportions of energy consumption for heating, ventilation and domestic hot water preparation (DHW) have changed. The latter component can now play a significant role, not only in the context of the annual heat demand, but also in the context of selecting the peak power of the heat source. In this paper, the comparison of chosen methods for its calculation is presented. The results show that for contemporary residential buildings, the peak power for DHW preparation can achieve the same or higher value as the peak power for heating and ventilat

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Pezzutto, Simon, Silvia Croce, Stefano Zambotti, Lukas Kranzl, Antonio Novelli, and Pietro Zambelli. "Assessment of the Space Heating and Domestic Hot Water Market in Europe—Open Data and Results." Energies 12, no. 9 (2019): 1760. http://dx.doi.org/10.3390/en12091760.

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The paper investigates the European space heating (SH) and domestic hot water (DHW) market in order to close knowledge gaps concerning its size. The stimulus for this research arises from incongruences found in SH and DHW market’s data in spite of over two decades of scientific research. The given investigation has been carried out in the framework of the Hotmaps project (Horizon 2020—H2020), which aims at designing an open source toolbox to support urban planners, energy agencies, and public authorities in heating and cooling (H&C) planning on country, regional, and local levels. Our rese

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Emhofer, Johann, Klemens Marx, Tilman Barz, et al. "Techno-Economic Analysis of a Heat Pump Cycle Including a Three-Media Refrigerant/Phase Change Material/Water Heat Exchanger in the Hot Superheated Section for Efficient Domestic Hot Water Generation." Applied Sciences 10, no. 21 (2020): 7873. http://dx.doi.org/10.3390/app10217873.

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Integration of a three-media refrigerant/phase change material (PCM)/water heat exchanger (RPW-HEX) in the hot superheated section of a heat pump (HP) system is a promising approach to save energy for domestic hot water (DHW) generation in multi-family houses. The RPW-HEX works as a desuperheater and as a latent thermal energy storage in the system. The latent thermal energy storage is charged during heating and cooling operation and discharged for DHW production. For this purpose, the water side of the RPW-HEX is connected to decentralized DHW storage devices. DHW consumption, building standa

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Al Koussa, Jad, Rutger Baeten, Nico Robeyn, and Robbe Salenbien. "A multipurpose test rig for district heating substations: domestic hot water preparation and keep-warm function comparison." E3S Web of Conferences 111 (2019): 06012. http://dx.doi.org/10.1051/e3sconf/201911106012.

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A well performing District Heating Substation (DHS) is crucial for the efficiency of the District Heating (DH), especially with the shift towards low temperature 4th generation DH systems. For this reason, testing and characterization of commercially available DHSs becomes important to estimate their effect on the DH network. Within the thermo-technical laboratory of EnergyVille, a multipurpose test rig has been built for testing DHSs. In this setup, different DH conditions and heat demand profiles for space heating and for Domestic Hot Water (DHW) can be emulated. Independent tests have been

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Brancato, Vincenza, Larisa G. Gordeeva, Angela Caprì, Alexandra D. Grekova, and Andrea Frazzica. "Experimental Comparison of Innovative Composite Sorbents for Space Heating and Domestic Hot Water Storage." Crystals 11, no. 5 (2021): 476. http://dx.doi.org/10.3390/cryst11050476.

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In this study, the development and comparative characterization of different composite sorbents for thermal energy storage applications is reported. Two different applications were targeted, namely, low-temperature space heating (SH) and domestic hot water (DHW) provision. From a literature analysis, the most promising hygroscopic salts were selected for these conditions, being LiCl for SH and LiBr for DHW. Furthermore, two mesoporous silica gel matrixes and a macroporous vermiculite were acquired to prepare the composites. A complete characterization was performed by investigating the porous

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Jahanbin, Aminhossein, GIOVANNI SEMPRINI, and Maurizio Goni. "Techno-economic analysis of a novel retrofit solution for the domestic hot water system: A comparative study." Energy Conversion and Management 292 (July 4, 2023): 18. https://doi.org/10.5281/zenodo.10839067.

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The retrofit solution for domestic hot water (DHW) system in existing buildings requires to ensure the long-term energy security and efficiency as well as to minimise occupants’ disturbance, construction works and installation costs. In this regard, the present study performs a techno-economic evaluation on a novel retrofit solution forDHW production in a pilot building. The proposed solution appoints a substantial role to the thermal energy storage through a 2-pipe hot water network utilisable for both DHW and heating purposes. The first storage level is provided by

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Ivanko, Dmytro, Natasa Nord, Åse Lekang Sørensen, Thale Sofie Wester Plesser, Harald Taxt Walnum, and Igor Sartori. "Identifying typical hourly DHW energy use profiles in a hotel in Norway by using statistical methods." E3S Web of Conferences 111 (2019): 04015. http://dx.doi.org/10.1051/e3sconf/201911104015.

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The aim of this research is to improve the existing approaches of domestic hot water (DHW) energy use analysis in buildings. A comprehensive statistical analysis of hourly DHW energy use for a hotel in Oslo, Norway, was performed. To recognize the trend of DHW energy use over several years, Centered Moving Average method was applied. To increase the accuracy of DHW energy use analysis, it was proposed to identify the months and days of the week with similar characteristics of DHW energy use and build unified profiles for them. For this purpose, the approaches based on the student’s t-tests and

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Fijewski, Michał, Iwona Polarczyk, and Joanna Paduchowska. "Analysis and simulation of the circulation pump operation." E3S Web of Conferences 116 (2019): 00022. http://dx.doi.org/10.1051/e3sconf/201911600022.

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The operation of the circulation installation has a significant impact on the energy efficiency of the building and it contributes to its reduction. The article refers to the actual measurement data obtained from the measurements of the domestic hot water (DHW) preparation system in a multi-family residential building in Wroclaw. On their basis, various possibilities of controlling the operation of the circulation installation without reducing the comfort of DHW operation system were presented and simulated. The results are illustrated in the form of measurable savings in energy consumption an

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Ravina, Marco, Costanza Gamberini, Alessandro Casasso, and Deborah Panepinto. "Environmental and Health Impacts of Domestic Hot Water (DHW) Boilers in Urban Areas: A Case Study from Turin, NW Italy." International Journal of Environmental Research and Public Health 17, no. 2 (2020): 595. http://dx.doi.org/10.3390/ijerph17020595.

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Domestic hot water heat pumps (DHW HPs) have spread fast in recent years in Europe and they now represent an interesting opportunity for implementing renewable energy sources in buildings with a centralized/district heating system, where DWH is generally produced by a gas boiler or an electric water heater. Replacing these appliances has several environmental benefits, including the removal of air pollution sources and the reduction of Green House Gasses (GHG) emissions. In this work, we present the techno-economic and environmental evaluation of implementing DHW HPs in Turin, where 66% of the

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Dogkas, George, John Konstantaras, Maria K. Koukou, Vassilis N. Stathopoulos, Luis Coelho, and Amandio Rebola. "Evaluating a prototype compact thermal energy storage tank using paraffin-based phase change material for domestic hot water production." E3S Web of Conferences 116 (2019): 00016. http://dx.doi.org/10.1051/e3sconf/201911600016.

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A full-scale thermal energy storage system using phase change materials (PCM) is experimentally investigated for solar and geothermal applications. The system consists of a rectangular tank filled with PCM and a staggered fin tube heat exchanger (HE). The system is designed for the production of Domestic Hot Water (DHW) based on the EU Commission Regulation No 814/2013 [1] requirements. The characteristics that are studied are the stored energy density of the system, the heat transfer rate through the HE during the charging and discharging processes, the adequacy of produced hot water amount a

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Chicherin, Stanislav. "Planning District Heating System Loads with Regard to Modern Heat Consumption Features." Proceedings of Irkutsk State Technical University 21, no. 6 (2017): 103–10. https://doi.org/10.21285/1814-3520-2017-6-103-110.

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MODEL FOR PLANNING LOADS IN DISTRICT HEATING OPERATION UNDER THE MODERN HEAT DEMAND <strong>SUMMARY. AIM.</strong> Nowadays a large number of district heat utilities are faced with excessive domestic hot water (DHW) load, at the same time its impact is not clear. <strong>METHODS.</strong> As well as reviewing the existing heat demands and densities we looked at development plan of 2016–2017. <strong>RESULTS AND THEIR DISCUSSION.</strong> There are several types of heat exchanger connections used for domestic hot water (DHW) and space heating (SH) water generation in the substations; it a

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Dudkiewicz, Edyta, and Marta Laska. "Inequality of water consumption for hygienic and sanitary purposes in production halls." E3S Web of Conferences 100 (2019): 00014. http://dx.doi.org/10.1051/e3sconf/201910000014.

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Water consumption in hall buildings is substantial and characterised by variability over the time: yearly, seasonality, monthly, weekly, daily, hourly and second. Both, water consumption and their irregularity, influence on many processes and technical issues. Purposes for which water is consumed are various. Beyond the technological processes, one of the most water-intensive demand is need for water for hygienic and sanitary purposes, especially in production buildings with high degree of soiling work. The paper presents the study of hot water (DHW) consumption and its profile for sanitary an

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Zheng, Peijun, Peng Liu, and Yeqi Zhang. "Economic Assessment and Control Strategy of Combined Heat and Power Employed in Centralized Domestic Hot Water Systems." Applied Sciences 11, no. 10 (2021): 4326. http://dx.doi.org/10.3390/app11104326.

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With the increasing application of CHP and an industry transition to distributed energy, it is necessary to make a comprehensive economic analysis and comparison of the entire lifetime of CHP from the net present value (NPV), payback period, and cost-saving ratio (CSR). Five systems, including micro-CHP, gas boiler (GB), air-source heat pump (ASHP), domestic gas-fired heater and domestic electric hot water-heater, are simulated. First, this paper takes annual heat use efficiency (AHUE) into account to compare the economy of each domestic hot water (DHW) system. The results show that a domestic

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Ortiz, Dania, Vítor Leal, and Isabel Azevedo. "A Review of the Measures and Instruments to Promote Efficiency and Renewable Energy in Domestic Water Heating." Energies 13, no. 20 (2020): 5370. http://dx.doi.org/10.3390/en13205370.

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This paper identifies and characterizes the technical measures and policy instruments that can be used to promote energy efficiency and the use of renewable sources for domestic hot water (DHW). DHW presents a considerable potential for abatement of greenhouse gas emissions around the world. Measures were characterized in terms of level of transformation, impact and scope, among others. Policy instruments were characterized in terms of target groups, competences required for implementation, major challenges and nature of the instruments. A matrix showing the applicability of policy instruments

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Ivanko, Dmytro, Harald Taxt Walnum, Åse Lekang Sørensen, and Natasa Nord. "Analysis of monthly and daily profiles of DHW use in apartment blocks in Norway." E3S Web of Conferences 172 (2020): 12002. http://dx.doi.org/10.1051/e3sconf/202017212002.

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Profiles of domestic hot water (DHW) use give valuable information for achieving energy saving in buildings. In this article, analysis of monthly and hourly profiles in apartment blocks in Norway was performed. The aim was firstly to identify influencing factors on DHW use and afterwards to define typical DHW use profiles. Due to availability, two different data samples were used for monthly and hourly analysis. Monthly data from 49 apartments showed that approximately 30% of DHW was used in kitchens and the rest 70% in bathrooms. The influence of apartment sizes on DHW use was tested based on

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Aguilar, F. J., D. Crespí, and P. V. Quiles. "Experimental and numerical study of the domestic hot water production with PV panels and a heat pump." E3S Web of Conferences 111 (2019): 01066. http://dx.doi.org/10.1051/e3sconf/201911101066.

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This article presents an experimental and modelling work which uses a compact domestic hot water heat pump (DHW-HP) that is simultaneously powered from photovoltaic panels (PV) and from the grid. Results from more than 240 days of experimental works have been used in order to develop and to validate the computer model of the system. The program, implemented in MATLAB, is computationally ‘light’ enough to allow mid-term simulations yet also detailed enough to accurately and coherently portray stratification within thermal storage tanks. Finally, as an example of the model capabilities, it has b

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Gómez, Miguel A., Sergio Chapela, Joaquín Collazo, and José L. Míguez. "CFD Analysis of a Buffer Tank Redesigned with a Thermosyphon Concentrator Tube." Energies 12, no. 11 (2019): 2162. http://dx.doi.org/10.3390/en12112162.

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This study analyzes a buffer tank simulated in both continuous operation mode and heating mode using CFD techniques. The analysis is focused in the thermal behavior of the tank, especially in parameters such as heat exchanged, heating time, and temperature distributions into the tank, in order to propose a better design. The results of the different simulations show that the tank heats water extremely slowly and extremely evenly when producing domestic hot water (DHW), which negatively affects the thermal stratification that is critical for rapidly reaching the DHW temperature. Therefore, the

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Zhou, Xin, Xin Meng, and Zhenyu Li. "ANN-LSTM-A Water Consumption Prediction Based on Attention Mechanism Enhancement." Energies 17, no. 5 (2024): 1102. http://dx.doi.org/10.3390/en17051102.

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To reduce the energy consumption of domestic hot water (DHW) production, it is necessary to reasonably select a water supply plan through early predictions of DHW consumption to optimize energy consumption. However, the fluctuations and intermittence of DHW consumption bring great challenges to the prediction of water consumption. In this paper, an ANN-LSTM-A water quantity prediction model based on attention mechanism (AM) enhancement is improved. The model includes an input layer, an AM layer, a hidden layer, and an output layer. Based on the combination of artificial neural network (ANN) an

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Chicherin, Stanislav, Lyazzat Junussova, and Timur Junussov. "Advanced Control of a District Heating System with High Residential Domestic Hot Water Demand." E3S Web of Conferences 160 (2020): 01004. http://dx.doi.org/10.1051/e3sconf/202016001004.

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Proper adjustment of domestic hot water (DHW) load structure can balance energy demand with the supply. Inefficiency in primary energy use prompted Omsk DH company to be a strong proponent of a flow controller at each substation. Here the return temperature is fixed to the lowest possible value and the supply temperature is solved. Thirty-five design scenarios are defined for each load deviation index with equally distributed outdoor temperature ranging from +8 for the start of a heating season towards extreme load at temperature of -26°C. All the calculation results are listed. If a flow cont

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Skoneczny, Kamil. "Influence of the quantity profile of the domestic hot water demand and the energy demand for the heating in a single-family house on the SCOP of the air-to-water heat pump." E3S Web of Conferences 44 (2018): 00162. http://dx.doi.org/10.1051/e3sconf/20184400162.

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In the article it was discussed how the energy efficiency of the air-to-water heat pump can change depending on the different ways of the building usage. The author shows that the following factors influence this efficiency: the DHW demand and the demand of the energy for the heating of the building. The article shows that it is very important to take into account the cooperation of both systems, the DHW and the heating. Two models of the SCOP calculations were discussed: in monthly and hourly steps of the calculation. For each model the following assumptions were considered: the different pro

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Marszal-Pomianowska, Anna, Rasmus Lund Jensen, Michal Pomianowski, Olena Kalyanova Larsen, Scharling Jacob Jørgensen, and Sofie Sand Knudsen. "Domestic hot water system in residential buildings: production, distribution and consumption energy loss. Monitoring campaign in two Danish detached houses." Journal of Physics: Conference Series 2069, no. 1 (2021): 012104. http://dx.doi.org/10.1088/1742-6596/2069/1/012104.

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Abstract The share of the energy use for domestic hot water (DHW) in the total energy consumption of buildings is becoming more and more prominent. Depending on the building typology it varies between 20% to 50% of the total energy usage for old and new built single family house, respectively. The aim of this paper is to determine the energy losses in the DHW installation with division between: a) loss at the production point, b) loss in the distribution, and c) loss at the draw-off points using the results of the measurements of DHW consumption in two single family houses connected to distric

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Byrne, Paul. "Research Summary and Literature Review on Modelling and Simulation of Heat Pumps for Simultaneous Heating and Cooling for Buildings." Energies 15, no. 10 (2022): 3529. http://dx.doi.org/10.3390/en15103529.

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A heat pump for simultaneous heating and cooling (HPS) is a refrigeration machine by which the productions of heating and cooling energies are simultaneously valorized. This introductory article presents the uses of heat pump productions under the form of an analysis of thermal demands of different types of buildings and a literature review of real installations and experimental systems, which are the basis of the construction of numerical models. The applications of HPSs are diverse: space heating and cooling, domestic hot water (DHW), hot water for desalination process, etc. Means and method

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Balan, Mircea, Mihnea Sandu, and Florin Bode. "In-building direct wastewater heat recovery solutions for enhancing thermal efficiency in domestic hot water systems." E3S Web of Conferences 608 (2025): 01015. https://doi.org/10.1051/e3sconf/202560801015.

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Enhancing energy efficiency in buildings is necessary for reducing environmental impact and operational costs, with domestic hot water (DHW) systems accounting for a significant portion of residential energy consumption. This paper provides a comprehensive overview of in-building direct wastewater heat recovery (WHR) systems as a means to improve thermal efficiency in DHW systems. Various direct WHR technologies are explored, focusing on vertical and horizontal heat exchangers, detailing their design, operation, and efficiency. The study analyses factors influencing the performance of these sy

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Denis, Yvan, Frédéric Suard, Aurore Lomet, and David Chèze. "Saving energy by anticipating hot water production: identification of key points for an efficient statistical model integration." Artificial Intelligence for Engineering Design, Analysis and Manufacturing 33, no. 02 (2019): 138–47. http://dx.doi.org/10.1017/s0890060419000143.

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AbstractThis work aims to evaluate the energy savings that can be achieved in domestic hot water (DHW) production using consumption forecasting through statistical modeling. It uses our forecast algorithm and aims at investigating how it can improve energy efficiency depending on the system configuration. Especially, the influence of the DHW production type used is evaluated as well as the water tank insulation. To that end, real consumption measurements are used for model training. Then simulations are run on using TRNSYS software to compute the total energy consumption of DHW production syst

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Wądołowska, Bernadetta, and Dorota Anna Krawczyk. "Analysis of the Advisability of Using Solar Collectors in a Single-Family House in Poland and Spain." Proceedings 51, no. 1 (2020): 9. http://dx.doi.org/10.3390/proceedings2020051009.

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In this paper we show the advisability of usage of solar collectors for domestic hot water (DHW) preparation in buildings located in two countries: Poland and Spain. The analysis was conducted for a single-family house with horizontal roof. During the calculations we took into account factors depending on the building location such as national rules, climatic conditions, cost of system installation, and fuel and electricity prices. Based on the total design heat losses and demand for DHW, the demand for usable energy for heating the buildings and DHW preparation was calculated. A gas boiler wa

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Bekkouche, Sidi Mohammed El Amine, Rachid Djeffal, Mohamed Kamal Cherier, et al. "Experimental Performance and Cost-Effectiveness of a Combined Heating System under Saharan Climate." Buildings 13, no. 3 (2023): 635. http://dx.doi.org/10.3390/buildings13030635.

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The solar water heater can be integrated into future residential buildings as the main energy source, which will subsequently reduce the energy cost of water heating. An original configuration for an efficient Domestic Hot Water (DHW) storage tank is developed and experimentally evaluated under Saharan climate. This novel DHW configuration includes a hybrid (solar and electric) energy system with a flat plate solar collector coupled with an electric heater. Additionally, a phase change material (PCM) mixture that is composed of paraffin wax and animal fat with a melting temperature between 35.

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Muñoz de la Peña, Maria, Luca Molinaroli, Barbara Torregrosa, and Gaspar Paya. "Model and simulation of multi-functional variable refrigerant flow systems in EnergyPlus." E3S Web of Conferences 343 (2022): 05004. http://dx.doi.org/10.1051/e3sconf/202234305004.

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The multi-functional variable refrigerant flow (MFVRF) system is a promising solution to meet the UE objective that all new buildings shall be nearly zero-energy buildings (NZEBs). In particular, it is a high-efficiency system able to supply space cooling, space heating and domestic hot water (DHW) production simultaneously in different zones allowing also for waste heat recovery. The aim of this work is to implement a novel dynamic model of the MFVRF in EnergyPlus 9.4 in order to assess its final energy consumption and to account for the heat recovered when working in cooling mode to be used

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Koukou, Maria K., Christos Pagkalos, George Dogkas, et al. "Computational Approach of Charging and Discharging Phases in a Novel Compact Solar Collector with Integrated Thermal Energy Storage Tank: Study of Different Phase Change Materials." Energies 15, no. 3 (2022): 1113. http://dx.doi.org/10.3390/en15031113.

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A numerical study was carried out to investigate charging and discharging processes of different phase change materials (PCMs) used for thermal storage in an innovative solar collector, targeting domestic hot water (DHW) requirements. The aim was to study PCMs that meet all application requirements, considering their thermal performance in terms of stored and retrieved energy, outlet temperatures, and water flow rate. Work was carried out for three flat-plate solar panels of different sizes. For each panel, a PCM tank with a heat exchanger was attached on the back plate. Simulations were condu

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