scholarly journals Yearly Cost Saving by Using Enthalpy Heat Exchanger During Cooling and Heating

2020 ◽  
Vol 328 ◽  
pp. 01014
Author(s):  
Kamil Križo ◽  
Andrej Kapjor ◽  
Martin Vantúch
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Building Energy ◽  
Sensible Heat ◽  
Oxygen Level ◽  
Optimal Temperature ◽  
Air Handling Unit ◽  
Save Energy ◽  
Yearly Cost

Fresh air has to be constantly supplied to the building by air handling unit, where supplied air is mixed with inside air and optimal temperature, oxygen level is adjusted and level of dust and smoke is reduced. Supply air demand of the building is determined according to number of persons in the room, room area and regulations. Necessity of ventilation rely in supplying room with oxygen, cleaning the air, adjusting temperature and moisture and reduction of odours, gases, dust, bacteria and viruses. Achieving optimal properties of supply air creates huge portion of building energy consumption. To save energy during ventilation, standard air to air sensible heat exchangers are used. They purpose is to recover sensible heat from exhaust air and at the same time avoid contamination of supply air. Drawback of these types of exchangers is limit of recovering moisture, therefore huge portion of energy in form of latent heat is lost. On top of classical plate air to air heat exchanger, enthalpy heat exchanger allows to exchange latent as well as sensible heat [1].

scholarly journals Analysis of Yearly Effectiveness of a Diaphragm Ground Heat Exchanger Supported by an Ultraviolet Sterilamp

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2804
Author(s):  
Sławomir Rabczak ◽  
Paweł Kut
Keyword(s):  
Heat Exchanger ◽  
Ultraviolet Radiation ◽  
Heat Exchangers ◽  
Ground Heat Exchanger ◽  
Atmospheric Air ◽  
Ground Heat Exchangers ◽  
Air Handling Unit ◽  
Operational Costs ◽  
Uv C

Ground heat exchangers supplement ventilation systems and provide notable power gains by heating ventilated air during winter and cooling it in summer. Additionally, they prevent recuperator exchangers from freezing. In atmospheric air, there are many types of contaminants and microorganisms that significantly affect the quality of ventilated air. The air that flows through the system of pipes of the heat exchanger may also become contaminated. In order to remove contamination from ventilated air, ultraviolet radiation may be used. This article presents a concept of using a UV-C (ultraviolet with a wavelength of 200–280 nm) lamp in the air duct in front of the air handling unit connected to the ground heat exchanger. The UV-C lamp, apart from clearing the air, may also decrease operational costs thanks to eliminating contamination that forms bacterial jelly on heat exchanger elements.

Research on Measures of Civil Engineering Construction to Achieve the Landscape Green Energy Saving

2014 ◽  
Vol 716-717 ◽  
pp. 240-243
Author(s):  
Lin Ke ◽  
Ji Cui Chang ◽  
Quan Zheng
Keyword(s):  
Energy Consumption ◽  
Energy Conservation ◽  
Energy Saving ◽  
Civil Engineering ◽  
Building Energy ◽  
Green Energy ◽  
Low Carbon ◽  
Engineering Construction ◽  
Building Energy Saving ◽  
Save Energy

Low-carbon environment and energy saving have gradually into the enterprise development idea. In the construction industry, civil engineering construction of energy conservation and environmental protection has reached a certain level after a period of development. It is of great significance to build energy conservation measures in civil engineering for improving environmental quality and save energy consumption. This article analyzes measures from the civil engineering overview and application status of building energy saving measures, the importance of building energy saving measures in combination with civil engineering. The measures are important for our country to make a certain contribution to saving energy consumption and realize the sustainable development.

Adaptive Neurocontrol and Minimization of Energy Consumption of a Heat Exchanger Test Facility

2000 ◽  
Author(s):  
Gerardo Díaz ◽  
Mihir Sen ◽  
Rodney L. McClain
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Energy Consumption ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Test Facility ◽  
The Neural Network ◽  
On Line ◽  
Artificial Neural ◽  
And Control

Abstract It has been shown that artificial neural networks (ANNs) can be used to simulate and control thermal systems such as heat exchangers. It is known that the characteristics of thermal components such as heat exchangers vary with respect to time mainly due to fouling effects. There is a need of a model that can adapt to the new characteristics of the thermal system. In this work adaptive artificial neural networks are used to control the outlet air temperature of a heat exchanger test facility. The neurocontrollers are adapted on-line on the basis of different criteria. The parameters of the ANNs are modified considering target error and stability conditions of the closed loop system analyzed as a nonlinear iterative map. We also implement a minimization of a performance index that quantifies the energy consumption. It is shown numerically and experimentally that the neural network is able to control the thermal facility, and is also able to adapt to different disturbances applied to the system, while minimizing the amount of energy used.

Determination of Optimum Design Parameters of Horizontal Parallel Pipe and Vertical U-Tube Ground Heat Exchangers

2009 ◽  
Author(s):  
Hakan Demir ◽  
Ahmet Koyun ◽  
S¸. O¨zgu¨r Atayılmaz
Keyword(s):  
Thermal Conductivity ◽  
Energy Consumption ◽  
Heat Exchanger ◽  
Objective Function ◽  
Heat Exchangers ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Soil Thermal Conductivity ◽  
Ground Heat Exchangers ◽  
Ground Source

The most important part of a ground source heat pump (GSHP) is the ground heat exchanger (GHE) that consists of pipes buried in the soil and is used for transferring heat between the soil and the heat exchanger of the ground source heat pump. Soil composition, thermal properties and water content affect the length of ground heat exchanger. Another parameter affects the size of the ground heat exchanger is the shape. There are two basic ground heat exchanger configurations: vertical U-tube and horizontal parallel pipe. There are plenty of works on ground source heat pumps and ground heat exchangers in the literature. Most of the works on ground heat exchangers are based on the heat transfer in the soil and temperature distribution around the coil. Some of the works for thermo-economic optimization of thermal systems are based on thermodynamic cycles. This study covers comparative thermo-economical analysis of horizontal parallel pipe and vertical u-tube ground heat exchangers. An objective function has been defined based on heating capacity, investment and energy consumption costs of ground heat exchanger. Investment and energy consumption costs were taken into account as total cost in the objective function. The effects of the soil thermal conductivity, number of pipes, thermal capacity of ground heat exchanger, pipe diameter and the burial depth on the objective function were examined. The main disadvantage of U-tube ground heat exchanger is higher borehole cost that makes installation cost higher than parallel pipe ground heat exchanger. To make reference functions equal for both type of ground heat exchangers, the borehole cost must be under 20 $/m (now 55 $/m) for a given heating or cooling capacity. The performance of ground heat exchangers depends on the soil characteristics especially the soil thermal conductivity.

Hybrid Desiccant Cooling System Using Condensing Heat as the Regeneration Source. Part I: System Model

2011 ◽  
Vol 383-390 ◽  
pp. 6422-6426 ◽  
Author(s):  
Xing Han ◽  
Xu Zhang
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Energy Saving ◽  
Cooling System ◽  
System Model ◽  
Sensible Heat ◽  
Vapor Compression ◽  
Refrigeration Unit ◽  
Vapor Compression Refrigeration

In this paper, a scheme of hybrid desiccant dehumidification system was proposed. This system can recovery the condensing heat from the vapor compression refrigeration unit to remove moisture from the air. But the trick of energy saving is the sensible heat exchanger after the desiccant rotary wheel. After analysis of its energy consumption characteristic, the system model was established.

A New Type of Heat Exchanger for Ventilation in Buildings with Nearly-Zero Energy Consumption

2014 ◽  
Vol 899 ◽  
pp. 231-234 ◽  
Author(s):  
Petr Horák ◽  
Adam Pavel ◽  
Iva Ambrožová
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Air Conditioning ◽  
Lower Cost ◽  
Great Promise ◽  
Zero Energy ◽  
Heating Performance ◽  
New Type ◽  
Air Conditioning Systems

This article describes a new type of hollow-fiber heat exchanger that provides similar heating performance to conventional metal heat exchangers commonly used in air conditioning systems but at lower cost and greater simplicity. While factors such as fragility and element fouling have yet to be optimized, the exchanger shows great promise for application in buildings aiming at close-to-zero energy consumption.

scholarly journals Energy Efficiency Evaluation of Industrial Heat Exchangers Based on Fuzzy Matter Element Method

Mechanika ◽  
2020 ◽  
Vol 26 (2) ◽  
pp. 171-176
Author(s):  
Wei Ye
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Efficiency Evaluation ◽  
Tube Heat Exchanger ◽  
Shell And Tube ◽  
Energy Efficiency Evaluation ◽  
Whole Life Cycle ◽  
Element Method

According to the energy consumption status of industrial heat exchanger in the whole life cycle, the energy efficiency evaluation index system of industrial heat exchanger is put forward firstly. Secondly, aiming at the complexity and fuzziness of energy consumption of industrial heat exchanger, the energy efficiency evaluation model of industrial heat exchanger based on fuzzy matter-element method is established by using fuzzy matter-element theory and combining the concept of Hemingway schedule. Finally, taking the shell-and-tube heat exchanger as an example, five shell-and-tube heat exchangers with different designs and materials were selected to analyze their energy consumption advantages and disadvantages. Via calculation and analysis, the optimal energy efficiency design of the shell-and-tube heat exchanger was obtained. At the same time, reference opinions were provided for the design and manufacture of the shell-and-tube heat exchanger.

scholarly journals Minimization of the Lifecycle Cost of a Rotary Heat Exchanger Used in Building Ventilation Systems in Cold Climates

2021 ◽  
Vol 67 (6) ◽  
pp. 302-310
Author(s):  
Ignas Sokolnikas ◽  
Kęstutis Čiuprinskas ◽  
Jolanta Čiuprinskienė
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Heat Recovery ◽  
Foil Thickness ◽  
Geometrical Parameters ◽  
Cold Climates ◽  
Heat Transfer Efficiency ◽  
Air Handling Unit ◽  
Building Ventilation ◽  
Ventilation Systems

This article presents an analysis of rotary heat exchangers (RHE) used as heat recovery units in building ventilation systems in cold climates. Usually, heat exchangers with the highest heat transfer efficiency are the preferable option for this purpose. However, such exchangers usually have the highest media pressure drop, thus requiring the highest amount of energy for media transportation. In this study, the problem is solved by analysing the lifecycle cost (LCC) of the RHE including both the recovered heat and the electricity consumed in the fans of the air handling unit (AHU). The purpose of the investigation was to determine the optimal set of geometrical characteristics such as the exchanger’s length, foil thickness, the height and width of the air channel. Two hundred and seventy different combinations were examined using analytical dependencies and ANSYS simulations. The results are compared with experimental data obtained earlier at the KOMFOVENT laboratory. The results show that the best overall energy efficiency is obtained in heat exchangers that do not offer the best heat recovery efficiency, and LCC differences in the same climatic and economic conditions can go as high as 31 %, mainly due to the geometrical parameters of the heat exchanger.

scholarly journals ANALYSIS OF ENERGY CONSUMPTION ECONOMY IN CRYOGENIC SYSTEMS BY THE USE OF HEAT EXCHANGERS

2017 ◽  
Vol 60 (3) ◽  
pp. 256-264
Author(s):  
A. V. Trotsenko
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Power Consumption ◽  
Heat Exchangers ◽  
Power Plants ◽  
Operating Regime ◽  
Working Fluid ◽  
Mode Of Operation ◽  
Required Quality ◽  
Power Costs

Evaluation of energy consumption economy due to implementation of the principle of cold regeneration is a formidable problem of exergy analysis of cryogenic systems. A method or evaluation of power consumption economy due to the presence of heat exchangers in the scheme of cryogenic plant is suggested in the present article. The calculations of the economy for the refrigeration and liquefaction regimes of cryogenic nitrogen plant operating in accordance with a simple throttle cycle have been carried out. The approximate method for evaluation of power consumption economy demonstrated that for a simple throttle cycle the use of the heat exchanger enables to reduce power costs by about 30 % regardless of the mode of operation. The use of a heat exchanger makes it possible to avoid the problems associated with the use of work produced in the expander. The analysis of the results of the performed calculations demonstrated that the economy is practically independent on the operating regime. For the analyzed systems the minimal pressures of the working fluid after compressor that are needed to obtain a specified quantity of a product of required quality have been determined. The calculations made for Linde cycle demonstrated that this value depends on the mode of operation, but it is significantly less than the pressure in the cycle. The presented approach to determining the economy of energy consumption in low-temperature systems is applicable to power plants due to the presence of heat exchangers in its design. For such an application one need to override the purpose of these devices and to alter the equations exergy balances in accordance with it.

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