Search or ask a question

What is Heat efficiency?

Plate heat exchanger

Plate fin heat exchanger

Micro heat exchanger

Shell and tube heat exchanger

Best insight from top research papers

Heat efficiency refers to the effectiveness of a system in transferring or converting heat energy. It can be measured by comparing the actual heat transfer achieved in a system to the optimum heat transfer rate . Factors affecting heat efficiency include irreversibility and unavailability of energy, with reasons for energy unavailability stemming from reference point settings and non-optimal heat transfer processes . Various devices and methods have been developed to enhance heat efficiency, such as heat efficiency measuring devices for heat exchangers , efficient heat radiating devices utilizing thermoelectric materials , and heat efficiency medium conductors that improve heat transfer efficiency through pressure effects in a vacuum chamber . Understanding and optimizing heat efficiency is crucial for improving the performance and energy utilization of heat transfer processes.

Answers from top 5 papers

PDF

Open Access

More filters

Papers (5)	Insight
Patent Heat efficiency medium conductor Huang Bin 22 Jun 2016	Heat efficiency refers to the effectiveness of heat transfer processes. The invention introduces a medium conductor that significantly enhances heat transfer efficiency through pressure effects in a vacuum chamber.
Proceedings Article•DOI Thermal Efficiency of the Cross Flow Heat Exchangers Ahmad Fakheri 01 Jan 2006 9 Citations	Heat efficiency is the ratio of actual heat transfer in a heat exchanger to the optimum heat transfer rate. It is a key parameter for assessing heat exchanger performance.
Open access•Journal Article The Efficiency of Heat Transfer Process Hu Guo 01 Jan 2011-Journal of Engineering Thermophysics 10 Citations	Heat efficiency is not traditionally defined due to conservation in heat transfer. The paper introduces entransy transfer efficiency based on entransy, discussing factors like irreversibility and unavailability.
Patent Efficient heat radiating device Wu Mingyu 02 Feb 2018	The efficient heat radiating device in the paper enhances heat dissipation in electronic products by utilizing thermoelectric materials and metal electrodes, resulting in fast and noiseless cooling, saving space and cost.
Patent Heat efficiency measuring device for heat exchanger Maogang Tao, Jiasong Guo, Gui Shu, Liang Song, Jing Liang, Jing Cai - Show less +5 more 11 Jul 2012 3 Citations	Heat efficiency refers to the effectiveness of a heat exchanger in transferring heat. The device in the paper measures heat efficiency using flow and temperature sensors, A/D converter, wireless transmission, and central processing unit.

My columns

Related Questions

What is heat efgiciency?5 answersHeat efficiency refers to the effectiveness and productivity of heat-related processes or systems in various industries and applications. It plays a crucial role in ensuring optimal performance, cost-effectiveness, and environmental sustainability. Different tools and devices have been developed to measure and enhance heat efficiency, such as the HEAT software application for analyzing clinical pathways in healthcare settingsand a heat efficiency measuring device for heat exchangers. These tools help in monitoring and optimizing heat transfer, reducing heat loss, and saving energy. Efficient heat energy processing systems have also been designed to utilize low-temperature heat sources effectively while minimizing environmental impact. Overall, heat efficiency is essential for improving performance, reducing costs, and promoting sustainability across various sectors.

Why is energy efficiency important?5 answersImproving energy efficiency is important for several reasons. Firstly, it helps reduce the electricity cost burden on households and businesses, making energy access more affordable. Secondly, it plays a crucial role in minimizing the societal and environmental impacts of economic growth, offering a powerful tool for achieving sustainable development. Thirdly, low levels of energy efficiency in electric power supply and energy use can absorb a high share of available financial resources, hindering economic development. Additionally, energy efficiency can reduce investments in energy infrastructure, cut costs, maximize consumer welfare, and decrease emissions. Finally, energy efficiency is one of the most economical and effective ways to reduce dependence on foreign oil, decrease greenhouse gas emissions, and achieve energy security.

What is the definition of efficiency?3 answersEfficiency can be defined as the degree of conformity between means, efforts, measures, actions, etc. and the specific goals they are intended to achieve. It is a measure of the useful effect achieved in relation to the resources or efforts expended. In other words, efficiency can be quantitatively expressed as the ratio between the effects achieved and the resources or efforts required to obtain them. It involves maximizing the effects obtained per unit of allocated resources or minimizing the resource consumption per unit of effect achieved. Efficiency is a fundamental category that expresses patterns inherent in any kind of human activity. It is a key factor in accelerating economic growth and plays a crucial role in various fields such as operations and architecture.

What is economic efficiency?2 answersEconomic efficiency refers to the comparison between the effects or outcomes of an action and the resources or efforts required to achieve those effects. It is a measure of how well resources are utilized to produce desired results. In the context of the free market, economic efficiency is crucial for the performance of economic agents. It can be applied to various fields such as economics, social sciences, education, health, and sports. The concept of economic efficiency involves evaluating the relationship between the resources expended and the resulting effects, whether in physical or value units of measurement. It is an important indicator of economic development and plays a significant role in accelerating economic growth. The determination of economic efficiency relies on factors such as optimal resource utilization, rational labor use, and effective production management.

What is efficiency?5 answersEfficiency is a concept that relates to producing an effect or effects while minimizing the resources expended. It can be understood as the ratio of useful work to energy expended in the context of mechanics and thermodynamics. Efficiency is also used in economics to indicate the state of optimality, but it is not necessarily quantifiable. In engineering, efficiency is both a general term indicating a job well and economically done, and a specific technical assessment tied to measurements of performance in machines and energy. Efficiency is a measure of the extent to which means match ends, serving a purpose or realizing a utility. It is a pervasive idea that extends beyond economics. Efficiency can be understood as a measure of the correspondence between means and the tasks they solve in the context of operations, with different concepts of efficiency arising from the variety of activities and goals involved.

What is Efficiency of Processes?5 answersEfficiency of processes refers to the extent to which inputs are effectively utilized to produce desired outputs. It is a measure of how well resources are used to achieve a specific goal. In the context of various industries, including the petrochemical industry, healthcare sector, manufacturing processes, and business process management, efficiency is a crucial factor for optimizing operations and achieving desired outcomes. For example, in the petrochemical industry, improving the efficiency of oil treatment and reducing losses during extraction, processing, and transportation of oil are important considerations. In healthcare, efficiency analysis helps evaluate the utilization of resources in providing healthcare services. Similarly, in manufacturing processes, energy and eco-efficiency are key indicators for evaluating the efficiency of unit processes. In business process management, efficiency analysis systems are used to evaluate and reengineer existing processes. Overall, efficiency of processes plays a vital role in enhancing productivity, reducing waste, and achieving organizational goals.

See what other people are reading

What is heating and cooling curve in canning process?

Heating and cooling curves in the canning process refer to the temperature profiles experienced by canned food during the sterilization and cooling phases. These curves are crucial for determining the effectiveness of the thermal process in ensuring food safety. Various parameters such as g values, heating rate index, thermal destruction curve characteristics, and cooling lag factor play significant roles in defining these curves. Mathematical procedures and numerical calculations are employed to estimate the slowest heating or cooling points within the canned food, considering factors like convection and free convection in the food product. Experimental studies have shown that accurate prediction of temperature distributions during heat sterilization and cooling is achievable through analytical models and effective heat transfer coefficient calculations.How does the twisted pitch length affect the heat transfer efficiency in double pipe heat exchangers?

The twisted pitch length significantly impacts heat transfer efficiency in double pipe heat exchangers. Research shows that varying the twist pitch length in twisted tube inserts influences heat transfer performance. A study comparing square and oval twisted tubes revealed that the tube with the smallest pitch length exhibited higher Nusselt numbers and friction factors, enhancing heat transfer. Additionally, experiments with twisted tape inserts demonstrated that as the twist ratio increased, heat transfer performance improved while friction loss penalties decreased, ultimately enhancing thermohydraulic performance. Furthermore, investigations on twisted tape inserts at different twist ratios highlighted that the maximum Nusselt number and thermo-hydraulic performance were achieved at specific twist ratios and insert lengths, emphasizing the critical role of twist pitch length in optimizing heat transfer efficiency.Does temperature lift effect the exergy efficiency of a heat pump?

The temperature lift does indeed impact the exergy efficiency of a heat pump. Research indicates that optimizing the temperature glide match between the sink and source sides can reduce exergy destruction due to heat transfer, leading to increased performance. Additionally, in a high temperature double effect absorption heat transformer, the gross temperature lift affects the exergy coefficient of performance, with a recommended limit not exceeding 72 K for improved system performance. Furthermore, the efficiency of thermal exergy transfer at near-environmental temperatures is influenced by temperature changes, with different temperature combinations yielding varying functional exergy efficiencies. Moreover, in multi-stage compression heat pump systems, the exergy efficiencies improve with an increase in compression stages, showcasing the impact of temperature lift on exergy efficiency.How does the twisted pitch thickness affect the flow patterns and turbulence within the double pipe heat exchanger?

The twisted pitch thickness in a double pipe heat exchanger significantly influences flow patterns and turbulence. Research indicates that twisted tape inserts with varying twist ratios and depths of W-cut induce turbulence and flow separation, enhancing fluid mixing and heat transfer efficiency. Additionally, the insertion of twisted tapes, ribs, and conical rings alters the geometry of heat exchangers, promoting secondary eddy flows that intensify turbulence and mixing, thereby improving heat transfer. Numerical investigations show that as the twist ratio of twisted tapes increases, heat transfer performance improves while friction loss penalties decrease, ultimately enhancing thermohydraulic performance. Furthermore, CFD modeling demonstrates that modified twisted tape inserts increase convective heat transfer coefficients, with higher Nusselt numbers and thermal-hydraulic performance compared to classic internals.What are the key components of the HVAC process flow in an economizer system?

The key components of the HVAC process flow in an economizer system include various elements such as air intakes, controllers, sensors, chambers, connecting ports, heat exchangers, and cooling towers. These components work together to optimize energy efficiency and regulate the temperature within the system. For instance, the system may consist of airside economizers with different air intakes for return air and outdoor air, a controller to determine cooling modes based on enthalpy calculations, an economizer chamber with connecting ports for condenser and evaporator, and heat exchangers like surface and plate heat exchangers along with a cooling tower for heat transfer and maintaining temperature stability during testing. By integrating these components, the economizer system can effectively enhance energy conservation and system performance.What is the throttling effect thermodynamics?

The throttling effect in thermodynamics refers to the resistance of a fire in a tunnel to airflow, with larger fires exhibiting greater resistance. This phenomenon is crucial in understanding the interaction between fire and tunnel flow, impacting smoke management strategies. In a different context, the throttling effect is also observed in the operation of a precooled Joule-Thomson cooler, where bypass and throttling mechanisms are utilized to enhance refrigeration capacity by reducing temperature differences and entropy generation within the heat exchanger. Furthermore, in the realm of hypersonic inlets, the utilization of a heat source for flow control influences shock wave–boundary layer interactions, leading to improved total pressure recovery and reduced flow distortion.What is the minimum size of ERV in cross flow arrangement?

The minimum size of an Energy Recovery Ventilator (ERV) in a cross-flow arrangement can vary based on the design specifics. In general, cross-flow heat exchangers, such as micro heat exchangers, offer advantages in terms of high mass flow rate, low pressure drop, and high heat transfer rates due to their numerous parallel microchannels. These microchannels typically have heights ranging from a few hundred micrometers to about 2000 micrometers and widths from around 50 micrometers to a few hundred micrometers. Additionally, the use of tubular modules with anion or cation exchanger tubular membranes can enhance separation methods like electrodialysis in cross-flow techniques, providing high permeation rates and simple construction. Therefore, the minimum size of an ERV in a cross-flow arrangement would depend on factors like the specific application, desired performance, and efficiency requirements.What are the design considerations for selecting the minimum size of ERV in cross flow arrangements?

The design considerations for selecting the minimum size of Energy Recovery Ventilators (ERV) in cross flow arrangements involve optimizing heat transfer effectiveness, physical dimensions, and pressure drop. Various methods like theoretical approaches, practical prototyping, and numerical simulations are employed to enhance effectiveness. Sizing problems in heat exchanger design focus on meeting specified heat duty, pressure drops, and other criteria by determining physical sizes, flow arrangements, and surface geometries. Additionally, the use of entropy generation minimization methods allows for the assessment of thermodynamic losses due to heat transfer and pressure drop, aiding in the simultaneous optimization of design parameters for tube banks in crossflow arrangements. These approaches aim to achieve maximum effectiveness while minimizing the volume of the heat exchanger for a given pressure loss.What factors influence the selection of the minimum size of ERV in cross flow arrangements?

The selection of the minimum size of Energy Recovery Ventilators (ERV) in cross flow arrangements is influenced by various factors. These include the optimization of design variables such as heat distribution factor, heat duty, pressure drop, and the physical dimensions of the heat exchanger surfaces. Additionally, the minimization of entropy generation, which accounts for thermodynamic losses due to heat transfer and pressure drop, plays a crucial role in determining the size of ERVs in cross flow configurations. Furthermore, the impact of numerical noise in optimization methods, such as Response Surface Models and gradient-based methods, should be considered to ensure accurate sizing and performance evaluation of ERVs in cross flow systems.Minimum possible cross flow heat exchanger?

The optimization of a minimum possible cross-flow heat exchanger involves maximizing hot fluid effectiveness and minimizing entropy generation units. Various methodologies like Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) are employed to determine optimal design values, achieving a function value of 0.0534786 for entropy generation minimization and 0.99997095 for hot fluid effectiveness maximization. Multi-objective optimization using GA results in a pareto-front showcasing different design values. Additionally, the concept of entropy generation minimization in a plate fin heat exchanger (PFHE) is explored, separating it into thermal and pressure entropy generation for simultaneous minimization, leading to lower entropy generation, reduced pressure drop, and pumping power. The study also delves into the optimum design of cross-flow in-line tube banks for efficient heat transfer.What is the error if the flow does not reach to fully developed in heat exchanger?

When the flow does not reach a fully developed state in a heat exchanger, errors can arise in heat transfer coefficient calculations. In microchannel heat exchangers, the assumption of a constant overall heat transfer coefficient across the exchanger is challenged due to the presence of developing flow regions. This leads to significant variations in the overall heat transfer coefficient, especially in the developing region, necessitating the inclusion of three-dimensional heat transfer in the analysis. Neglecting the lateral heat diffusion in certain flow scenarios can result in substantial errors in determining heat transfer coefficients, impacting the accuracy of heat exchanger designs. Therefore, understanding the implications of incomplete flow development is crucial for ensuring precise heat transfer calculations and efficient heat exchanger performance.