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Publications related to Heat Pumps (10,000)
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Article
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The frosting phenomenon poses a potential threat to both industrial production and daily life. Typically, a frost layer consists of frost crystals that grow on various micro-sized frozen droplets, and its development is signifi- cantly affected by the frost crystal behaviors. To better understand the frosting mechanism, a series of experi- ments ar...
Article
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Individual households, responsible for 25% of total energy consumption in Europe, are crucial actors in the energy transition. Although various policies and energy choices are available for such actors (e.g., individual solar photovoltaic or community energy systems), they are usually restricted to municipal governance, and public opinion towards n...
Article
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Novel food drying technologies minimally alter essential nutrients and sensory qualities of food. Industry 4.0 technologies reduce the cost and time of production, energy, and resource consumption in food drying processes-transitions toward Industry 5.0 supported developing collaboration between human beings and machines to shift from a focus from...
Presentation
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Online Webinar on the Integration of High-Temperature Heat Pumps in Swiss Industrial Processes (HTHP-CH) on 7 November 2024, from 8:30 to 11:30. This exclusive event offers industry experts and researchers insights into integrating HTHPs in Swiss case studies. Agenda: Introduction (Nicole Calame-Darbellay, CSD) (5 min) Guideline for HTHP integrati...
Article
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In recent years, the extreme climate caused by global warming has brought serious consequences to the world. In order to alleviate the problem of global warming, many scholars have started to analyse energy-saving green buildings. Taking the Bullitt Center as an example, this paper illustrates the innovative applications of energy-efficient buildin...
Article
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The work proposes a comparison between three heating configurations covering the demand of a new settlement: 1) centralized district heating system (DHC); 2) 5 th generation district heating & cooling system (5GDHC) and 3) individual home heating and cooling (HHC) systems. Thermal and electrical loads are evaluated by transient simulations of a res...
Article
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The purpose of this study was to evaluate the economic and financial alternatives for industrial methanol (MeOH) production in Colombia, taking advantage of renewable energy and heat pump technology. The main objective was to analyze the feasibility of converting an existing hydrogen production plant into a methanol synthesis plant at a refinery lo...
Preprint
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Due to the diverse functionalities of different thermal machines, their optimization relies on a case-by-case basis, lacking unified results. In this work, we propose a general approach to determine power-efficiency trade-off relation (PETOR) for any thermal machine. For cases where cycle (of duration $\tau$) irreversibility satisfies the typical $...
Article
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The glass, ceramic and cement plants are energy intensive industrial systems, releasing high amounts of greenhouse gases. The dissipation of the waste heat reduces their profitability, energy and ecological efficiency. The absorption refrigeration systems are successful solutions for the recovery of thermal energy at different temperature levels to...
Article
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Jordan is currently facing an energy crisis characterized by a heavy dependence on imported fossil fuels, prompting the nation to target a 50% share of renewable energy by 2030. This study introduces a novel approach by simulating hybrid solar-geothermal heat pump systems tailored to various Jordanian locations, assessing both their energy efficien...
Article
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Heat pumping through thermoelectric devices has many advantages over traditional cooling. However, their current efficiency is a limiting factor in their implementation. In this paper, we approach the non-convex topology optimization of thermoelectrical elements for cooling applications through the method of moving asymptotes (MMA) to improve their...
Article
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Recent advancements in sensor technologies have significantly improved the monitoring and control of various energy parameters, enabling more precise and adaptive management strategies for smart microgrids. This work presents a novel model of an energy management system (EMS) for grid-connected polygeneration microgrids that allows optimizing the m...
Article
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Energy systems design is challenged by uncertainties in energy carrier costs. This study explores hydrogen and conventional energy carrier costs, providing global insights with a focus on Belgium. Over two years, European natural gas prices surged 55-fold, while solid biomass prices varied only 1.8-fold over 13 years. Regression analysis (adjusted...
Article
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Efficient and clean treatment of wastewater and energy recovery and utilization are important links to realize low-carbon development of oilfields. Therefore, this paper innovatively proposes a multi-energy complementary co-production heating system which fully and efficiently utilizes solar energy resources, oilfield waste heat resources, and biom...
Article
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Aquifer Thermal Energy Storage (ATES) is an underground thermal energy storage technology that provides large capacity (of order MW to 10s of MW), low carbon heating and cooling to large buildings and building complexes, or district heating/cooling networks. The technology operates through seasonal capture, storage and re-use of thermal energy in s...
Article
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Energy conservation measures (ECMs) are often chosen for their immediate benefits, such as suitability to past/current climate conditions and rapid economic returns. However, the longevity of these ECMs poses a risk of becoming outdated or ineffective as climate change alters the very climatic parameters they were designed for. This paper provides...
Article
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A modified single-adsorber cycle for a gas-fired adsorption heat pump (GAHP) is described and analyzed through dynamic simulation with Modelica. The adsorption modules are based on the SAPO-34 / water working pair with parameters taken from a recent R&D project. A stratified storage integrated into the primary heat pump loop is employed for heat re...
Article
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The focus of this study is to optimize the exploration of biomass-driven multi-energy systems, which include combined heat, power, and gas generation. The objective is to enhance the thermal, environmental, and economic performance indicators of the system. The optimization objectives encompass the quantities of internal combustion engines and air...
Conference Paper
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Campus Ullevål, a new office building, is currently under construction at Ullevål in Oslo. In conjunction with this building there will be constructed an energy wall surrounding the building foundation. The wall is a modified version of the conventional sheet pile walls that are typically installed in constructions pits in clay in Norway. The energ...
Article
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Ground source heat pump (GSHP) systems have been widely used in the field of shallow geothermal heating and cooling because of their high thermal efficiency and environmental friendliness. A borehole heat exchanger (BHE) is the key part of a ground source heat pump system, and its performance and investment cost have a direct and significant impact...
Article
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The use of heat pumps makes it possible to reduce energy consumption in drying processes. This study addresses the problem of efficient use of a heat pump for drying, low-temperature processing, and storage of food products. The object of the study is a heat pump unit capable of operating under the drying mode or under the refrigeration processing...
Article
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Demand response (DR) enhances building energy flexibility, but its application in hybrid heating systems with dynamic pricings remains underexplored. This study applied DR via heating setpoint adjustments based on dynamic electricity and district heating (DH) prices to a building heated by a hybrid ground source heat pump (GSHP) system coupled to a...
Article
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Validated CO 2 ejector models are essential for developing high-performance refrigeration and heat pump cycles. This study focuses on assessing the Homogeneous Equilibrium Model’s applicability to simulate a CO 2 flashing ejector at a reduced pressure of 0.47. The model was implemented in FLUENT, integrating a user-defined real gas model. Simulatio...
Article
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Geothermal energy is increasingly promising for residential use due to rising energy costs and environmental awareness. This work experimentally examines the impact of pipe distribution on the heat pump's performance at varying temperatures for both the incoming water and the ground. The pipes are buried in the soil, distributing them on layers of...
Article
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Hybrid energy systems combine multiple energy sources and storage technologies to enhance performance and meet diverse energy needs. Hybrid heat pump systems are particularly suitable for heating and cooling buildings in rural areas. Air-source heat pumps have two well-known disadvantages during the coldest period of the year, when the building’s h...
Conference Paper
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Earth's natural heat has been used by humans for thousands of years. Based on historical records, it has been used in various parts of the world for medical purposes, cooking, bathing, and space heating. In light of the limited supply of fossil fuels, efforts are being directed toward alternate raw materials. An energy source that originates from t...
Article
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Background: The implementation of the EU climate and energy policy, along with changes in the legal environment, has led to a significant increase in energy prices in Poland. Consequently, energy expenditures are now a larger part of household budgets. These rising energy costs and the evolving legal landscape are compelling households to invest in...
Article
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The study aims to develop a methodology for selecting and justifying a multi-energy hub based on renewable energy sources for agricultural complex. The methodology has an international dimension and was tested for the pilot case of the study in an agricultural site in Kazakhstan. The methodology consists of two parts. With the help of the EnergyPro...
Article
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Vapor compression heat pump technology is a widely utilized method for energy conversion. Lubricating oil plays a crucial role in the heat pump system cycle by effectively reducing wear on the compressor’s moving parts and preventing refrigerant leakage. However, it can also create an oil film in the heat exchange equipment, which increases thermal...
Article
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The electrification of residential heating systems, crucial for achieving net-zero emissions, poses significant challenges for low-voltage distribution networks. This study develops a simulation model to explore the integration of heat pumps within active building systems for community heating decarbonisation. The model optimises heat pump operatio...
Conference Paper
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Collecting steady-state data is important in almost any experimental evaluation of thermal systems. Waiting for steady-states can take significant amounts of time and prevent researchers from more thorough data analysis or from collecting yet more experimental data at other operating conditions, system configurations or with different working fluid...
Article
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The issue of CO2 emissions from heat generators in autonomous heating systems is one of the most important indicators of human technological impact on the Earth's atmosphere. Heat generation is carried out by heat pumps, gas and electric boilers, and systems using solid and liquid hydrocarbon fuels. The purpose of this work is to assess the CO2 emi...
Article
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Climate change and its negative effects are driving the global shift from fossil fuels to renewable energy sources. To tackle the dependency on traditional energy sources in harsh winter regions and improve heating quality during periods of thermal demand fluctuations, this paper proposes a new distributed heating peak shaving system (DHPS). The sy...
Article
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Carbon footprint measures evidence the impact of organizations and individuals’ contribution to climate change. They can facilitate critical reflection. A community carbon footprint questionnaire is developed in cooperation with local people to enable them to reflect on how to reduce their personal carbon footprint in relation to their social and e...
Conference Paper
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Efficient electrification of space heating/cooling presents the most viable pathway to GHG emissions reduction, and heat pumps (HPs) remain the dominant alternative for replacing gas/oil-based space heating systems. To achieve widespread adoption of HPs, it is imperative to improve their energy efficiency and operational cost. In this paper, a scal...
Conference Paper
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Millions of compressors are used in refrigeration, air conditioning and heat pump systems. Their energy consumption is the most significant contributor to the efficiency of an entire HV AC system. The component specific isentropic efficiency is used for the energetic evaluation of compressors in accordance with globally standardized test procedures...
Article
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The paper deals with the experimental testing of the efficiency of the operation of an air/water heat pump in connection with three radiant systems in heating mode in an office building, which is part of the central laboratories of the Slovak university of Technology in Bratislava. The testing was aimed at verifying the manufacturer's theoretical c...
Article
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Moringa (Moringa oleifera), a tropical tree originating from India and Africa, is renowned for its modest utility as timber and its significance as a crucial vegetable crop. Notably, Moringa leaves serve as a concentrated source of vital nutrients, encompassing iron, calcium, proteins, vitamins (A, C, and E), dietary fiber, phosphorous, and potassi...
Article
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Freezing damage to tunnels in cold regions has long posed a threat to the safe operation of high-speed trains and other means of transportation. Finding a reasonable and effective solution to this problem, while also considering green, low-carbon, energy-saving, and environmental protection measures, has garnered widespread attention. Herein, the c...
Article
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The paper considers a developed scheme of operation and design of a desalination plant as part of an ener-gy technological complex, including a heat pump and a photovoltaic panel. It presents an analysis of literary sources on the topic of renewable energy sources as part of energy complexes and a technique for determining the exergy losses of wate...
Article
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Mediterranean European cities are characterized by high population density and limited space for large-scale implementation of renewable energy installations. This paper addresses the optimization of renewable energy installations in Mediterranean dwellings with the scope of increasing their energy contribution and cost-effectiveness. In a case stu...
Article
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According to extant Italian legislation implementing the Renewable Energy Directive, the mandatory renewable quota for a new building is 60% referring to a single service (e.g., heating during winter) or to multiple services (e.g., heating during winter and air conditioning during summer), depending on which services are actually present. The oblig...
Article
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To achieve the goals of carbon peaking and carbon neutrality, the retrofitting of existing coal-fired power plants is crucial to achieving energy-saving and emission reduction goals. A conventional recovery system of waste heat typically occurs downstream of the air preheater, where the energy quality in flue gas is low, resulting in limited coal-s...
Article
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Waste incineration has become the main treatment method for urban household waste, and it can produce a large amount of electricity. The efficiency of waste incineration plants is reduced due to the large amount of waste heat carried away by the flue gas. Recycling and utilizing the waste heat from flue gas are important in improving the economic b...
Article
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Transcritical heat pumps working with CO2-based mixtures with a low-volatility dopant are found to achieve good performances in thermally integrated heat pumps, especially when sensible heat sources and heat sinks are considered. This paper introduces in literature tetrachloroethylene, C2Cl2, as CO2-dopant for the mixture to be adopted as working f...
Preprint
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The shift towards decentralized and renewable energy sources has introduced significant challenges to traditional power systems, necessitating innovative market designs. Local energy markets present a viable solution for integrating distributed energy resources such as photovoltaic systems, electric vehicles, and heat pumps within various grid topo...
Article
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PV technology has become widespread in the Netherlands, reaching a cumulative installed capacity of 22.4 GWp in 2023 and ranking second in the world for solar PV per capita at 1268 W/capita. Despite this growth, there is an inherent discrepancy between energy supply and demand during the day. While the netting system in the Netherlands can currentl...
Article
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In recent years, advanced controllers, including Model Predictive Control (MPC), have emerged as promising solutions to improve the efficiency of building energy systems. This paper explores the capabilities of MPC in handling multiple control objectives and constraints. A first MPC controller focuses on the task of ensuring thermal comfort in a re...
Presentation
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The power networks are evolving with increased active components such as energy storage and flexibility derived from loads such as electric vehicles, heat pumps, industrial processes, etc. Better models are needed to accurately represent these assets; otherwise, their true capabilities might be over or under-estimated. In this work, we propose a ne...
Article
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Large scale heat pumps (LSHP) have seen a rapid proliferation in recent years, with projects and initiatives aimed at integrating electrically driven LSHP into existing district heating networks (DHN). The financial advantages have driven most LSHP installations to be powered by electricity generated by on-site cogeneration (CHP), given CHP’s domin...
Article
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This article presents an example of the joint use of a compressor heat pump that uses propane as a natural, ecological thermodynamic medium and a phase heat accumulator that uses paraffin as a medium. Special attention has been paid to the solidification process of the phase change material, and a simple theoretical model of the solidification of t...
Article
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This study explores the critical role of financial incentives, energy performance certifications, government policies, and advanced technologies in driving the adoption of energy-efficient building practices. Financial incentives, such as tax credits, rebates, and grants, are shown to significantly reduce the upfront costs associated with energy-ef...
Preprint
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Thermoelectric (TE) heat pumps are a promising solid-state technology for space cooling and heating owing to their unique advantages such as environmental friendliness with no harmful refrigerants, small form factors, low noise, robustness with no moving parts, and demand-flexible operation. However, their low coefficient of performance (COP) prese...
Article
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Ground-source heat pump (GSHP) systems have emerged as energy-efficient alternate systems for the conventional Air-Source AirConditioning (ASAC) systems for space heating and cooling applications. GSHPs have gained widespread popularity globally and are extensively utilized in residential and commercial buildings. However, in countries like India w...
Article
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The article discusses the possibilities of using a step-up absorption heat pumps in autonomous heating systems and in industry. A system of autonomous heating with a step-up heat pump is proposed, where the energy source is geothermal water with a temperature of 40 °C, and the surrounding winter air with negative temperatures is used to remove heat...
Article
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Solid‐state refrigeration represents a promising alternative to vapor compression cooling systems. Solid‐state devices based on magnetocaloric, electrocaloric, and elastocaloric effects have demonstrated the ability to achieve high‐efficiency, reliable, and environment‐friendly refrigeration. Cooling devices based on the barocaloric (BC) effect—ent...
Preprint
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Heat pump-based renewable energy and waste heat recycling has become the mainstay of the Clean Heating Plan. Still, configuring a fit control system for that remains a worthwhile research topic. In order to address the problems that arose in the previous heating period, this study configures a Smith-predictor-based PID cascade control system with...
Article
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Review A Review of Geothermal Energy Coupled Hybrid System for Building Heat Supply Jianke Hao 1, Guosheng Jia 1,*, Zhendi Ma 1, Zhibin Zhang 1, Congfu Ma 1, Chonghua Cheng 2 and Liwen Jin 1,* 1 School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China 2 Shaanxi Yateer Scientific and Technological Innovation...
Technical Report
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The aim of this technical report is to give an overview of the performance of different heating and cooling caloric systems: magnetocaloric, elastocaloric, electrocaloric and barocaloric heat pumps. The performance of these innovative caloric heat pump systems is compared with that of conventional vapour-compression heat pumps. This overview is bui...
Conference Paper
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High temperature heat pumps have been gaining significant interest in recent years for decarbonizing industrial energy processes and in more recent developments they have been shown to reach up to 200°C of delivery temperature. For such heat pumps, several potentially suitable refrigerants have been considered, among them zeotropic mixtures are par...
Article
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District heating systems play a crucial role in the European Union for sustainable energy practices by contributing to reducing carbon emissions and thus counteracting climate change. In most European countries, the energy consumption for heating is a topic that needs to be considered. Germany has recognized the need for more awareness among its ci...
Conference Paper
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The idea of thermoelectric refrigeration has been explored in the past, but due to a shortage of appropriate thermocouple materials, all attempts to create a workable refrigerator have failed. This paper makes the recommendation to use semiconductors and discusses the aspects that influence the use of semiconductors. The conclusion is that high mea...
Article
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Low-emission high-temperature heating could be achieved by exploiting electrical heating, clean fuel, or carbon capture. However, it is difficult to replace current coal or natural gas furnaces in some places because the high-temperature thermal demand needs combustion. In the present work, the green hydrogen production process by solid oxide elect...
Article
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Educational institutions like other public and private organizations should try to eliminate their carbon footprint for the achievement of the ambitious 2050 target of net-zero carbon emissions. Several mature, reliable and cost-effective sustainable energy technologies can be used in these institutions replacing the use of fossil fuels and reducin...
Article
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Introduction In Switzerland, heating accounts for 70% of a building’s energy consumption, mostly fueled by fossil sources. Recently, cantonal regulations have mandated the use of renewable energy in heating, making heat pumps more significant. This study examines how public and private actors can create or transform a business ecosystem to facilita...
Article
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Heat pumps (HPs) have become pivotal for heating and cooling applications, serving as sustainable energy solutions. Coupled with renewable energy sources (RES) to run the compressor, which is the major energy-consuming component, they contribute to eco-conscious practices. Notably, their adaptability to be supplied by either alternating (AC) or dir...
Article
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Due to the increasing number of renewable energy sources and the growing number of energy consumers such as electric vehicles and heat pumps, distribution system operators face growing challenges in managing the grid. A promising direction for future grid management is the decentralization of computing power to individual agents within the distribu...