scholarly journals System Design of Electricity Generation Using Waste Heat from LNG Automobile

2020 ◽  
Vol 145 ◽  
pp. 02062
Author(s):  
Canzong Zhou ◽  
Shuyi Chen ◽  
Wei Cui ◽  
Zhengmao Yao
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Electricity Generation ◽  
Waste Heat ◽  
Cooling System ◽  
Combustion Engine ◽  
Lead Telluride ◽  
Maximum Output ◽  
Thermoelectric Conversion ◽  
Temperature Environment

According to the research, thermoelectricity generation can recycle the heat contained in the cooling system of internal combustion engine. This paper is about taking advantage of the feature in the huge temperature difference at about 560 °C which is formed between high-temperature engine and LNG (Liquefied Natural Gas) in low temperature and the ability that LNG provides semiconductor with thermoelectric conversion material so as to produce the maximum output voltage in low temperature. We take advantage of lead telluride materials that adapt to the high temperature environment and bismuth telluride materials that adapt to the low temperature environment, both of which forms a circuit and are designed as a thermoelectric power generation device. Also, we confirm the possibility of applying the device to cars.

scholarly journals Innovative Building Technology Implemented into Facades with Active Thermal Protection

2021 ◽  
Vol 13 (8) ◽  
pp. 4438
Author(s):  
Daniel Kalús ◽  
Jozef Gašparík ◽  
Peter Janík ◽  
Matej Kubica ◽  
Patrik Šťastný
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Thermal Insulation ◽  
Thermal Protection ◽  
Waste Heat ◽  
Cooling System ◽  
Renewable Energy Sources ◽  
Radiant Cooling ◽  
Technological Waste ◽  
Innovative Solution

The article focuses on the description of an innovative solution and application of active thermal protection of buildings using thermal insulation panels with active regulation of heat transfer in the form of a contact insulation system. The thermal insulation panels are part of a prefabricated lightweight outer shell, which together with the low-temperature heating and high-temperature cooling system creates an indoor environment. The energy source is usually renewable energy sources or technological waste heat. Research and development of an innovative facade system with active thermal protection is in the phase of computer simulations and preparation of laboratory measurements of thermal insulation panels with various combinations of energy functions. In the article we present theoretical assumptions, calculation procedure and parametric study of three basic design solutions of combined energy wall systems in the function of low-temperature radiant heating and high-temperature radiant cooling.

Active cooling system for downhole electronics in high temperature environments

2021 ◽  
pp. 1-16
Author(s):  
Wei Minghui ◽  
Cai Wei ◽  
Xu Mingze ◽  
Deng Shuang
Keyword(s):  
High Temperature ◽  
Cooling System ◽  
Capillary Tube ◽  
Thermal Characteristics ◽  
Electric Circuit ◽  
Passive Cooling ◽  
Electronic Components ◽  
Active Cooling ◽  
Temperature Environment ◽  
High Temperature Environment

Abstract Downhole high temperature environment is an important factor affecting the performance of downhole instrument electronic system.At present, various active cooling technologies and passive cooling technologies have been proposed to reduce the temperature of downhole electric circuit system.However, passive cooling technologies can only provide limited cooling capacity for drilling tools under high temperature environment, and the duration of cooling is short, which can not meet the long-time drilling task.This paper presents an Active cooling system(ACS)for downhole electronics and the effects of different temperatures on the performance of electronic components are analyzed.The ACS mainly includes a micro supercharger, condenser tube, evaporation pipe, capillary tube and refrigerant.The theoretical analysis of heat transfer and refrigerant capacity in high temperature environment is carried out.The thermal characteristics of the ACS is evaluated experimentally.The results show that the temperature of electronic components can be reduced to below 163°C in the 200°C downhole environment and components.The geomagnetic field data measured by electronic components at room temperature, 200 °C and with ACS are compared.The results show that ACS can keep electronic components working normally.

Indoor Environment and Energy Performance of Office Buildings Equipped with a Low Temperature Heating / High Temperature Cooling System

2014 ◽  
Vol 899 ◽  
pp. 36-41 ◽  
Author(s):  
Dušan Petráš ◽  
Michal Krajčík ◽  
Jozef Bugáň ◽  
Emília Ďurišová
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Indoor Environment ◽  
Cooling System ◽  
Energy Performance ◽  
Heat Pumps ◽  
Office Buildings ◽  
Cooling Systems ◽  
Temperature Heating

Energy performance and indoor environment were investigated in two modern office buildings equipped by a low temperature heating and high temperature cooling system. Both buildings have the facade made of glass. In the first building, radiant panels are suspended under the ceiling in order to create comfortable conditions, natural gas boilers are the installed in order to generate heat and chillers are used to generate cool. The second building has heat pumps installed to provide the building with heat/cool and capillary pipes are embedded in the plaster on the ceiling surface to emit the heat/cool into the occupied space. The energy performance was calculated in accordance with the set of CEN standards for energy certification and is presented in the form of energy certificates. Thermal comfort and indoor air quality were experimentally studied by long-term and short-term measurements and through questionnaires filled in by the occupants themselves. The study has shown that the low temperature heating/high temperature cooling system has the potential to create a comfortable indoor environment at low energy consumption, but the ability of the heating/cooling systems to do so is closely related to the appropriate control of the systems.

scholarly journals Analysis and Evaluation of Multi-Energy Cascade Utilization System for Ultra-Supercritical Units

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3969
Author(s):  
Shidan Chi ◽  
Tao Luan ◽  
Yan Liang ◽  
Xundong Hu ◽  
Yan Gao
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Waste Heat ◽  
Heat Rate ◽  
Large Temperature ◽  
Feed Water ◽  
Coal Consumption ◽  
Mass Transfer Processes ◽  
Exhaust Heat ◽  
New System

To address the large temperature difference in the air heater (AH) inlet of a traditional exhaust heat utilization system and energy grade mismatch problems during the heat and mass transfer processes, this study proposed a new multi-level waste heat cascade utilization system. Based on a principle of “temperature-to-port and cascade utilization”, this system uses the boiler side high-temperature flue gas and low-temperature air, and the turbine side high-temperature feed water and low-temperature condensate water, to conduct cross heat exchange according to the energy grade matching principle. Combined with a typical 1000 MW coal-fired unit, the heat transfer characteristics and energy-saving benefits of the new system were analyzed. The results showed that the new system has excellent performance: the heat rate decreased by 91 kJ/kWh, coal consumption decreased by 3.3 g/kWh, and power generation efficiency increased to 49.39%.

Combined Thermal Engine-Heat Pump Systems for Low-Temperature Heat Generation

1976 ◽  
Vol 190 (1) ◽  
pp. 255-265 ◽  
Author(s):  
G. Angelino ◽  
P. Ferrari ◽  
G. Giglioli ◽  
E. Macchi
Keyword(s):  
Low Temperature ◽  
Heat Pump ◽  
Heat Generation ◽  
Waste Heat ◽  
Combustion Engine ◽  
Heat Output ◽  
Direct Drive ◽  
Temperature Heat ◽  
Organic Fluids ◽  
External Combustion

SYNOPSIS A system is described for low-temperature heat generation for space heating envisaging the adoption of an organic fluid external combustion engine as the direct drive for a heat pump. Waste heat from the engine condenser contributes a substantial fraction of the overall heat output. Progress in experimental work to ascertain the suitability of organic fluids to operate at comparatively high temperature without appreciable decomposition or corrosive action on materials is reported. Results are given of a computation program predicting the performance of systems of various capacity. For the examples considered yearly fuel consumption was calculated to range between 41 and 48% of that of a conventional plant.

Research on the Application Technology of Linear CCD in Dynamic Measuring Molten Tin Glass Surface

2008 ◽  
Vol 381-382 ◽  
pp. 169-172
Author(s):  
Y. Yu ◽  
Shu Xing Xu
Keyword(s):  
High Temperature ◽  
Cooling System ◽  
Glass Production ◽  
Measuring Method ◽  
Float Glass ◽  
Measurement Device ◽  
Linear Ccd ◽  
Temperature Environment ◽  
On Line ◽  
High Temperature Environment

In this paper, the characteristics of the high temperature environment in tin bath and the practical glassmaking of float glass production are analyzed. Dynamic optical measuring method is selected to measure glass thickness. A semiconductor laser is used for the light source and a linear CCD is used for the detector to pick up data within 600°C on the area of the tin bath. By analyzing and calculating a lot of dynamic measurement experimental data tested with the measurement device. Based upon the theory of heat transfer, the working area of the measurement device can be kept at a constant temperature near the tin bath by using a circulation water-cooling system and low temperature nitrogen. The image processing technology is used for the edge detection and the pixel subdivision in the software of the system. At the same time the factors that influence accuracy of the system are discussed and some compensation measures are also proposed. The accuracy of 5µm dynamic on-line measurement is achieved and the accuracy of static measurement is less than 1µm within the range of 2~20mm thickness of glass. All these make linear CCD can be successfully applied in the practice of high temperature environment.

scholarly journals Experimental investigation of the ecological hybrid refrigeration cycle

2014 ◽  
Vol 35 (3) ◽  
pp. 145-154
Author(s):  
Piotr Cyklis ◽  
Ryszard Kantor ◽  
Tomasz Ryncarz ◽  
Bogusław Górski ◽  
Roman Duda
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Heat Source ◽  
Waste Heat ◽  
Temperature Limit ◽  
Working Fluid ◽  
Temperature Cycle ◽  
Compression System ◽  
High Temperature Limit ◽  
University Of Technology

Abstract The requirements for environmentally friendly refrigerants promote application of CO2 and water as working fluids. However there are two problems related to that, namely high temperature limit for CO2 in condenser due to the low critical temperature, and low temperature limit for water being the result of high triple point temperature. This can be avoided by application of the hybrid adsorption-compression system, where water is the working fluid in the adsorption high temperature cycle used to cool down the CO2 compression cycle condenser. The adsorption process is powered with a low temperature renewable heat source as solar collectors or other waste heat source. The refrigeration system integrating adsorption and compression system has been designed and constructed in the Laboratory of Thermodynamics and Thermal Machine Measurements of Cracow University of Technology. The heat source for adsorption system consists of 16 tube tulbular collectors. The CO2 compression low temperature cycle is based on two parallel compressors with frequency inverter. Energy efficiency and TEWI of this hybrid system is quite promising in comparison with the compression only systems.

scholarly journals METHODOLOGY FOR THE UTILIZATION OF WASTE HEAT BY AIR-COOLED COMPRESSORS

2021 ◽  
Vol 2021 (4) ◽  
pp. 4918-4923
Author(s):  
LUKAS PACAS ◽  
Keyword(s):  
Waste Heat ◽  
Cooling System ◽  
Combustion Engine ◽  
Electrical Energy ◽  
External Source ◽  
Compressed Air ◽  
Air Cooling ◽  
Hot Air ◽  
Air Compressors ◽  
Almost All

Compressed air is still a valid helper in many applications today, where it is necessary, for example, to move work equipment, pistons or it is used for cooling as a cooling medium. The producer of compressed air are air compressors, which need an external source for its production, usually an electric or internal combustion engine. Almost all the energy that is supplied to the compressor is always converted to heat during compression, regardless of the type of compressor. This carries the risk of overheating and therefore the cooling system must be optimally designed. Thus, during the compression of the air, a large part of the electrical energy supplied to the compressor is converted into heat, and only a small part of the supplied energy is in the compressed air. In the case of oil or water-cooled compressors, the exchangers can be used directly to obtain energy "for free". In the case of air cooling, a slight energy gain can only be achieved by modifying the exhaust hot air ducts. This energy can be used efficiently to heat water or heat buildings, instead of being uselessly ventilated. Modern compressors are already adapted for the use of waste heat, but most current companies still use older types of compressors that have not been directly adapted for the use of waste heat. In case of interest in obtaining waste heat, the reconstruction of the facility or development is inevitable.

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