HEATING AND COOLING SYSTEM FOR THE VACUUM VESSEL OF TEXTOR USING AN ORGANIC HEAT TRANSFER FLUID

1983 ◽  
pp. 261-266
Author(s):  
D.A. Butzek ◽  
J. Vieth ◽  
W. Kohlhaas
Keyword(s):  
Heat Transfer ◽  
Cooling System ◽  
Heat Transfer Fluid ◽  
Vacuum Vessel ◽  
Heating And Cooling

scholarly journals Numerical Evaluation of a HVAC System Based on a High-Performance Heat Transfer Fluid

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3298
Author(s):  
Gianpiero Colangelo ◽  
Brenda Raho ◽  
Marco Milanese ◽  
Arturo de Risi
Keyword(s):  
Heat Transfer ◽  
High Performance ◽  
Cooling System ◽  
Electrical Energy ◽  
Simulation Software ◽  
Heat Transfer Fluid ◽  
Hvac System ◽  
Dynamic Simulations ◽  
Heating And Cooling ◽  
The University

Nanofluids have great potential to improve the heat transfer properties of liquids, as demonstrated by recent studies. This paper presents a novel idea of utilizing nanofluid. It analyzes the performance of a HVAC (Heating Ventilation Air Conditioning) system using a high-performance heat transfer fluid (water-glycol nanofluid with nanoparticles of Al2O3), in the university campus of Lecce, Italy. The work describes the dynamic model of the building and its heating and cooling system, realized through the simulation software TRNSYS 17. The use of heat transfer fluid inseminated by nanoparticles in a real HVAC system is an innovative application that is difficult to find in the scientific literature so far. This work focuses on comparing the efficiency of the system working with a traditional water-glycol mixture with the same system that uses Al2O3-nanofluid. The results obtained by means of the dynamic simulations have confirmed what theoretically assumed, indicating the working conditions of the HVAC system that lead to lower operating costs and higher COP and EER, guaranteeing the optimal conditions of thermo-hygrometric comfort inside the building. Finally, the results showed that the use of a nanofluid based on water-glycol mixture and alumina increases the efficiency about 10% and at the same time reduces the electrical energy consumption of the HVAC system.

Continuous Operating Elastocaloric Heating and Cooling Device: Air Flow Investigation and Experimental Parameter Study

2019 ◽  
Author(s):  
Susanne-Marie Kirsch ◽  
Felix Welsch ◽  
Lukas Ehl ◽  
Nicolas Michaelis ◽  
Paul Motzki ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Cooling System ◽  
Air Flow ◽  
Experimental Parameter ◽  
Rotation Frequency ◽  
Coefficient Of Performance ◽  
Large Temperature ◽  
Parameter Study ◽  
Or Efficiency ◽  
Heating And Cooling

Abstract Elastocaloric cooling uses solid-state NiTi-based shape memory alloy (SMA) as a non-volatile cooling medium and enables a novel environment-friendly cooling technology without global warming potential. Due to the high specific latent heats activated by mechanical loading/unloading, large temperature changes can be generated in the material. Accompanied by a small required work input, a high coefficient of performance is achievable. Recently, a fully-functional and illustrative continuous operating elastocaloric fluid cooling system based on SMA is developed and realized, using a novel mechanical concept for individual loading and unloading of multiple SMA wire bundles. The fluid-based heat transfer system is designed for efficient heat exchange between the stationary heat source/sink and the SMA elements, operates without any additional heat transfer medium. Rotation frequency and fluid flow-rate are adjustable during operation, which allows adapting the operation point to power- or efficiency-optimized demands. The versatile placement of the in- and outlets allows different duct lengths and counter-flow or parallel-flow experiments. To investigate the air flow parameters at the in- and outlets, as well as the crossflow between the hot and cold side, a measurement system is developed and integrated. In this contribution, the first measurement results of the output temperatures for inlet air flow variation in combination with different rotation frequencies are presented.

scholarly journals Actualization of prospects of thermal usage of groundwater of mines during liquidation

2019 ◽  
Vol 123 ◽  
pp. 01046 ◽  
Author(s):  
Ivan Sadovenko ◽  
Oleksandr Inkin ◽  
Nataliia Dereviahina ◽  
Yuliia Khryplyvets
Keyword(s):  
Heat Transfer ◽  
Mine Water ◽  
Heat Removal ◽  
Heat Pumps ◽  
Heat Transfer Fluid ◽  
Circulation System ◽  
Heating And Cooling ◽  
Environmentally Safe ◽  
Mathcad Software ◽  
Almost All

The aim of the paper is justification of the economically efficient technological scheme for development of a thermal resource of “Stashkov” mine after its closure, ensuring the maintenance of a favorable energy and ecological-hydrogeological regime in the region. A geotechnological scheme of environmentally safe usage of mine water was justified, involving water pumping up to the surface, heat removal and water reverse pumping into the seams. The suggested circulation system is characterized by an increased energy balance, since it is used to extract almost all the groundwater heat, as well as part of the heat of host rocks. In order to estimate the effectiveness of usage of this technology, calculations of usage of mine water as a source of low-potential energy in heat pumps in comparison with other alternatives (groundwater and surface water streams) using Mathcad software were performed, and it was established that this gives great conversion coefficients of mine water. A geotechnological scheme of usage of mine water was developed, which considers heat transfer, filtration direction, velocity and temperature of groundwater during pumping and removal of heat-transfer fluid from an aquifer for heating and cooling of buildings. The mechanism of heat removal in a flooded rock massif of amine during liquidation was studied with justification of environmentally safe usage of mine water.

scholarly journals THERMAL PERFORMANCE ANALYSIS ON SOLAR INTEGRATED COLLECTOR STORAGE

2012 ◽  
pp. 283-286
Author(s):  
ABISHAKE ARUNASALAM ◽  
ANJAN RAVI ◽  
BOMMU SRIVATSA ◽  
R. SENTHIL
Keyword(s):  
Heat Transfer ◽  
Energy Source ◽  
Energy Storage ◽  
Cooling System ◽  
Renewable Energy Sources ◽  
Current Trend ◽  
Solar Heating ◽  
Heat Transfer Fluid ◽  
Solar Thermal Energy ◽  
Chloride Hexahydrate

The current trend very well signifies that the world is losing all its fossil fuels at a rapid pace. The main solution to get rid of this problem is to effectively make use of the Renewable Energy Sources available around us. Solar energy is one such renewable source of energy available and is encouraged to be used in every country for its sustainability. However, the energy source and the demand do not match each other, especially in solar heating applications. So at present, energy storage is the main focus in any solar heating and cooling system. Solar radiation is a time dependent energy source with an intermittent character. The main aim of this work is to analyze the charging and discharging performance of solar thermal energy storage system with phase change materials (PCMs) and to investigate the appropriate method of enhancement of heat transfer from fin to PCM and PCM to heat transfer fluid (HTF). The utilization of PCM in the heat storage is investigated experimentally for convective heat transfer between the PCM and air. The selected PCM, Magnesium Chloride hexahydrate worked well in the practical range of temperature of around 110C for a variety of domestic and industrial applications.

scholarly journals Experimental Investigation on Thermal Performance of Double-U-tube Heat Exchanger Using CuO/water Nanofluid as Heat Transfer Fluid

2020 ◽  
Vol 165 ◽  
pp. 01022
Author(s):  
Ruiqing Du ◽  
Dandan Jiang ◽  
Yong Wang
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Thermal Performance ◽  
Transfer Process ◽  
Heat Transfer Process ◽  
Heat Transfer Fluid ◽  
Geothermal Heat ◽  
Tube Heat Exchanger ◽  
Heating And Cooling ◽  
Geothermal Heat Exchanger

By applying the shallow ground energy to supply building heating and cooling, the geothermal heat exchanger systems were considered as an energy-efficient building service system. In this study, the CuO/water nanofluid was employed as circuit fluids of the geothermal heat exchanger system, and the thermal performance of the heat exchanger was investigated. The results showed that the heat transfer process of CuO/water nanofluid became stable earlier than that water. Furthermore, the heat transfer rate of nanofluid was higher than that of water when the heat transfer process plateaued.

scholarly journals Design, fabrication and performance test of heating and cooling system of JT-60 vacuum vessel.

1987 ◽  
Vol 29 (12) ◽  
pp. 1108-1115
Author(s):  
Masatsugu SHIMIZU ◽  
Tohru SHIMIZU ◽  
Noboru AKINO ◽  
Masahiro YAMAMOTO ◽  
Hideyuki TAKATSU ◽  
...  
Keyword(s):  
Performance Test ◽  
Cooling System ◽  
Vacuum Vessel ◽  
Heating And Cooling ◽  
And Performance

scholarly journals Development and Evaluation of an Improved Apparatus for Measuring the Emissivity at High Temperatures

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6252
Author(s):  
Mariacarla Arduini ◽  
Jochen Manara ◽  
Thomas Stark ◽  
Hans-Peter Ebert ◽  
Jürgen Hartmann
Keyword(s):  
Heat Transfer ◽  
Measurement Procedure ◽  
Heat Transfer Fluid ◽  
Vacuum Vessel ◽  
Heating Unit ◽  
Warm Up ◽  
Measurement Results ◽  
Emissivity Measurement ◽  
Ftir Spectrometer ◽  
Directional Emissivity

An improved apparatus for measuring the spectral directional emissivity in the wavelength range between 1 µm and 20 µm at temperatures up to 2400 K is presented in this paper. As a heating unit an inductor is used to warm up the specimen, as well as the blackbody reference to the specified temperatures. The heating unit is placed in a double-walled vacuum vessel. A defined temperature, as well as a homogenous temperature distribution of the whole surrounding is ensured by a heat transfer fluid flowing through the gap of the double-walled vessel. Additionally, the surrounding is coated with a high-emitting paint and serves as blackbody-like surrounding to ensure defined boundary conditions. For measuring the spectral directional emissivity at different emission angles, a movable mirror is installed in front of the specimen, which can be adjusted by a rotatable arrangement guiding the emitted radiation into the attached FTIR-spectrometer. The setup of the emissivity measurement apparatus (EMMA) and the measurement procedure are introduced, and the derived measurement results are presented. For evaluating the apparatus, measurements were performed on different materials. The determined emissivities agree well with values published in literature within the derived relative uncertainties below 4% for most wavelengths.

scholarly journals Effect of Modified Flow Schemes of Heat Transfer Fluid on the Performance of a Solar Absorption–Cooling System for an Educational Building in Pakistan

2020 ◽  
Vol 10 (9) ◽  
pp. 3327 ◽  
Author(s):  
Iftikhar Bashir Butt ◽  
Jinwang Tan ◽  
Adeel Waqas ◽  
Majid Ali ◽  
Adeel Javed ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flow Pattern ◽  
Cooling System ◽  
Electrical Energy ◽  
Primary Energy ◽  
Summer Season ◽  
Hot Water ◽  
Heat Transfer Fluid ◽  
Solar Absorption ◽  
Solar Absorption Cooling

Performance of solar absorption cooling systems (SACS) is the focus of contemporary studies for decreasing the electrical energy consumption of buildings as the conventional cooling system of buildings is the main consumer of electrical energy during the summer season in hot–humid climates. In this study, the performance analysis of SACS by manipulating different flow schemes to the heat transfer fluid between different components of the system was performed. TRNSYS model of SACS in an education building located at the city of Peshawar (34.00 N, 71.54 E), Pakistan to encounter the peak cooling load of 108 kW (during operating hours of the building i.e., 09 a.m. to 05 p.m.) is developed and all possible flow schemes of heat transfer fluid between the system’s components were compared. In Scheme-1 (S-1), a conventional flow pattern is used in which the hot water exiting from the chiller unit flows directly toward the stratified thermal storage unit. In Scheme-2 (S-2), the modified flow pattern of hot water exiting from the chiller unit will divert towards the auxiliary unit, if its temperature exceeds the temperature at the hot side outlet of the tank. Another modified flow pattern is Scheme-3 (S-3) in which the hot water leaving the chiller to keep diverting towards the auxiliary unit unless the outlet temperature from the hotter side of the tank would reach the minimum driving temperature (109 °C) of the chiller’s operation. Simulations in TRNSYS evaluates the SACS’s performance of all the schemes (conventional and modified) for the whole summer season and for each month. In general, S-3 with evacuated tube solar collector results in better primary energy saving with the smallest collector area per kilowatt for achieving 50% primary energy saving for the whole summer season.

Nano Fluids for Improving Efficiency in Wind Turbine Cooling System

2014 ◽  
Vol 984-985 ◽  
pp. 784-791
Author(s):  
C. P. Christin Raj ◽  
S.A. Ananthapuri Surendran ◽  
B. Amjathkhan ◽  
J.Antony Baksi Metilda ◽  
S.Eben Devaraj ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Wind Turbine ◽  
High Efficiency ◽  
Waste Heat ◽  
Cooling System ◽  
Colloidal Suspensions ◽  
Heat Transfer Fluid ◽  
Turbine Cooling

In order to reduce the entry of moisture, salt, sand and other external contaminations into the nacelle and also to reduce the fan noise which reaches the exterior, in this work a study of an innovative cooling system for off-shore wind turbine has been carried out. The new cooling technique is based on the use of nanofluids (engineered colloidal suspensions of nanoparticles in a base fluid). Nanofluids allow to increase the thermal conductivity of fluids and so to reduce the heat exchange surface and the heat transfer fluid flow rate due to the increased heat capacity. To reduce the amount of nanofluids circulating in the cooling system, the performance of a two-stage cooling circuit has been investigated. The first circuit takes the heat out of the generator and of the accessories whereas the second circuit, coupled with the first via an heat exchanger, dissipates the heat into the ambient. For the second circuit two options have been investigated. In the first solution the waste heat is dispersed using the tower as dissipator whereas in the second option the waste heat is exchanged with a titanium heat exchanger using marine water as heat transfer fluid.Both solutions assure high efficiency of heat exchange, long technical life expectancy and limited maintenance requirements.Keywords: Wind turbine, nanofluid, cooling system.

Ramp Wave Analysis of the Solid/Vapor Heat Pump

1990 ◽  
Vol 112 (1) ◽  
pp. 69-78 ◽  
Author(s):  
S. V. Shelton ◽  
W. J. Wepfer ◽  
D. J. Miles
Keyword(s):  
Heat Transfer ◽  
Heat Pump ◽  
Thermal Wave ◽  
Wave Model ◽  
Heat Transfer Fluid ◽  
Cycle Performance ◽  
Pump System ◽  
Square Wave ◽  
Vapor Adsorption ◽  
Heating And Cooling

A theramlly driven heat pump using a solid/vapor adsorption/desorption compression process in a vapor compression cycle is thermodynamically analyzed. The cycle utilizes a simple heat transfer fluid circulating loop for heating and cooling of two solid adsorbent beds. This heat transfer fluid loop also serves to transmit heat recovered from the adsorbing bed being cooled to the desorbing bed being heated. This heat recovery process greatly improves the efficiency of the single-stage solid/vapor adsorption process without the complication of a two-stage cycle. During the heating and cooling processes a thermal wave profile travels through the beds. Previous studies of this cycle used a square wave model to simulate the thermal wave front. This paper utilizes a more physically realistic ramp wave model to overcome the shortcomings of the square wave model. The ramp wave model is integrated into a thermodynamic cycle which provides detailed information on the performance of the beds as well as the COP and the heating and cooling outputs of the heat pump system. Significant cycle design and operating parameters are varied to determine their effect on cycle performance.

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