scholarly journals Simulation modeling of integrated heat and cooling supply systems in the Far North to assess efficiency

2021 ◽  
Vol 289 ◽  
pp. 04004
Author(s):  
Semen Vasilev
Keyword(s):  
Simulation Modeling ◽  
Waste Heat ◽  
Cooling System ◽  
Electricity Consumption ◽  
Far North ◽  
Absorption Chillers ◽  
Simulation Results ◽  
Supply Systems ◽  
The City ◽  
Integrated Power System

This paper proposes the creation of an integrated heat and cooling system in the city of Yakutsk. A classic version of district cooling (DC) with the use of absorption chillers is considered. The operation of the integrated power system was simulated for 3 months in the summer of 2019. The simulation results showed the presence of a sufficient amount of waste heat for the entire time of the DC operation, even for the maximum possible cooling demand. Calculations showed the possibility of reducing electricity consumption in the city from 0.8 to 20.0%. Primary economic indicators showed the possible economic success of such a project, if there is sufficient demand for cold.

Heat Integration of Absorption Heat Pump in a Milk Powder Dairy

2000 ◽  
Author(s):  
Jens Møller Andersen
Keyword(s):  
Heat Pump ◽  
Waste Heat ◽  
Cooling System ◽  
Milk Powder ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Heat Integration ◽  
Absorption Heat Pump ◽  
Absorption Cooling ◽  
Absorption Cooling System

Abstract Heat integration with absorption heat pumps requires investigation of many types of plant designs. In this article, it is concluded that in many cases high temperature absorption systems for heat recovery are more economically feasible than absorption systems for cooling purposes. The conclusion is based on a project where the scope was to investigate technical and economical possibilities for heat integration of an absorption heat pump in a milk powder plant. The first idea behind the project was to use the waste heat from the rejected air to drive an absorption cooling system to reduce the electricity consumption for cooling proposes. The model of the plant was based on simulations as a background for a time averaged COP model. It was concluded that an absorption system for generating low temperature steam is more feasible.

Comparative Performance Analysis of IADR Operating in Natural Gas-Fired and Waste-Heat CHP Modes

2006 ◽  
Author(s):  
Andrei Y. Petrov ◽  
James R. Sand ◽  
Abdolreza Zaltash ◽  
John Fischer ◽  
Rick Mitchell
Keyword(s):  
Natural Gas ◽  
Thermal Energy ◽  
Waste Heat ◽  
Cooling System ◽  
Cost Effective ◽  
Direct Expansion ◽  
Comparative Performance ◽  
Desiccant Wheel ◽  
Absorption Chillers ◽  
Expansion Cooling

Fuel utilization can be dramatically improved through effective recycle of "waste" heat produced as a by-product of on-site or near-site power generation technologies. Development of modular compact cooling, heating, and power (CHP) systems for end-use applications in commercial and institutional buildings is a key part of the Department of Energy's (DOE) energy policy. To effectively use the thermal energy from a wide variety of sources which is normally discarded to the ambient, many components such as heat exchangers, boilers, absorption chillers, and desiccant dehumidification systems must be further developed. Recently a compact, cost-effective, and energy-efficient integrated active-desiccant vapor-compression hybrid rooftop (IADR) unit has been introduced in the market. It combines the advantages of an advanced direct-expansion cooling system with the dehumidification capability of an active desiccant wheel. The aim of this study is to compare the efficiency of the IADR operation in baseline mode, when desiccant wheel regeneration is driven by a natural gas burner, and in CHP mode, when the waste heat recovered from microturbine exhaust gas is used for desiccant regeneration. Comparative analysis shows an excellent potential for more efficient use of the desiccant dehumidification as part of a CHP system and the importance of proper sizing of the CHP components. The most crucial factor in exploiting the efficiency of this application is the maximum use of thermal energy recovered for heating of regeneration air.

scholarly journals Reconstruction of the Water Supply to the City of Igarka of Krasnoyarsk Region

2021 ◽  
pp. 187-197
Author(s):  
Gregory V. Krasavin ◽  
Anatoly I. Matiushenko
Keyword(s):  
Water Supply ◽  
Water Intake ◽  
Supply System ◽  
Water Supply System ◽  
Water Supply Systems ◽  
Far North ◽  
Krasnoyarsk Region ◽  
Supply Systems ◽  
The City

Some features of use of water supply systems in the conditions of the Far North are stated. the considered water supply system in Igarka prior to the reconstruction. The reasons for the need for reconstruction of existing water intake facilities are presented. The composition of the reconstructed water intake facilities is described. The experience of operation of reconstructed water supply facilities in Igarka is summarized

Cooling and Dehumidification Characteristics of Desiccant Cooling System in a Residential Environment

2011 ◽  
Author(s):  
Changho Yun ◽  
Joon Ahn ◽  
Byung Ha Kang
Keyword(s):  
Waste Heat ◽  
Cooling System ◽  
Electricity Consumption ◽  
Field Tests ◽  
District Heating ◽  
Cooling Capacity ◽  
Water Evaporation ◽  
Vapor Compression ◽  
Greenhouse Gas Reduction ◽  
Indoor Conditions

Desiccant and water evaporation based cooling system is recently suggested as an alternative to refrigeration systems using typical vapor compression cycle for the purpose of energy saving and greenhouse gas reduction. The system receives the heat for the regeneration of the rotor from district heating, which is waste heat from a CHP plant or an incineration plant. KDHC (Korea District Heating Corporation) installed 4 systems at 4 individual houses in Su-Won, Korea and conducted field tests from Aug. 2010 to Sep. 2010. In this study, indoor conditions have been measured when the system is off as well as in operation. Also indoor conditions have been characterized according to outdoor conditions and users’ operation. Referring the ASHRAE standard, the cooling system in operation has been checked whether it could make indoor conditions comfortable or not. By analyzing the monitored variables, performance characteristics of the system were figured out. Major characteristics such as cooling capacity, heat & electricity consumption, and the COP of the system have been compared with those from the previous laboratory experiment.

SIMULATION OF SOFT START OF SYNCHRONOUS ELECTRIC DRIVES

2019 ◽  
Author(s):  
Shakhboz Dadabaev
Keyword(s):  
Computer Simulation ◽  
Electric Drive ◽  
Water Supply Systems ◽  
Factors Affecting ◽  
Electric Drives ◽  
Soft Start ◽  
Simulation Results ◽  
Pumping Units ◽  
Negative Factors ◽  
Supply Systems

The main negative factors affecting the starting modes of synchronous electric drives of pumping units of irrigation water supply systems were identified, computer simulation of direct and soft start of synchronous electric drive was made, the simulation results are shown in graphs and a brief conclusion was made on the study.

scholarly journals Cheating at Craps

2021 ◽  
Vol 48 (4) ◽  
pp. 53-61
Author(s):  
Andrea Marin ◽  
Carey Williamson
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Modeling And Simulation ◽  
Analytical Model ◽  
Quantitative Evaluation ◽  
Mathematical Analysis ◽  
Simulation Modeling ◽  
Analytical Modeling ◽  
The World ◽  
Simulation Results

Craps is a simple dice game that is popular in casinos around the world. While the rules for Craps, and its mathematical analysis, are reasonably straightforward, this paper instead focuses on the best ways to cheat at Craps, by using loaded (biased) dice. We use both analytical modeling and simulation modeling to study this intriguing dice game. Our modeling results show that biasing a die away from the value 1 or towards the value 5 lead to the best (and least detectable) cheating strategies, and that modest bias on two loaded dice can increase the winning probability above 50%. Our Monte Carlo simulation results provide validation for our analytical model, and also facilitate the quantitative evaluation of other scenarios, such as heterogeneous or correlated dice.

Numerical Simulation on the Temperature Characteristics of Indirect Air Cooling System

2015 ◽  
Vol 741 ◽  
pp. 536-540
Author(s):  
Xiao Zhi Qiu ◽  
Yan Ming Zhao ◽  
Bao Hua Huang ◽  
Wei Xu
Keyword(s):  
Numerical Simulation ◽  
Wind Speed ◽  
Cooling System ◽  
System Change ◽  
Temperature Characteristic ◽  
Air Cooling ◽  
Ansys Software ◽  
System A ◽  
Air Cooling System ◽  
Simulation Results

Based on the analysis of indirect air cooling system, a numerical simulation model of indirect air cooling system was constructed by ANSYS software. According to the different wind speed condition, the temperature characteristic of indirect air cooling system was analyzed. The simulation results show that with the increase of wind speed, the ventilation and heat release of the indirect air cooling system change greatly. It provides a theoretical basis for the design of the wind-proof device of indirect air cooling system.

Processing Techniques of a Silicon Carbide Heat Exchanger and its Capable Properties – A Review

2015 ◽  
Vol 787 ◽  
pp. 513-517 ◽  
Author(s):  
R. Pachaiyappan ◽  
R. Gopinath ◽  
S. Gopalakannan
Keyword(s):  
Silicon Carbide ◽  
Heat Exchanger ◽  
Gas Turbines ◽  
Cooling System ◽  
Composite Ceramic ◽  
Processing Technique ◽  
Full Potential ◽  
Absorption Chillers ◽  
Evaporative Cooling System ◽  
Processing Techniques

Silicon carbides is a composite ceramic material produced from inorganic non-metallic substances, formed from the molten mass which solidifies on cooling and simultaneously matured by the action of heat. It is used in various applications such as grinding wheels, filtration of gases and water, absorption, catalyst supports, concentrated solar powers, thermoelectric conversion etc. The modern usage of silicon carbide is fabricated as a heat exchanger for high temperature applications. Leaving behind steel and aluminium, silicon carbide has an excellent temperature withstanding capability of 1425°C. It is resistant to corrosion and chemical erosion. Modern fusion reactors, Stirling cycle based gas turbines, evaporators in evaporative cooling system for air condition and generator in LiBr/H2O absorption chillers for air conditioning those systems heat transfer rate can be improved by replacing a present heat exchanger with silicon carbide heat exchanger. This review presents a detailed discussion about processing technique of such a silicon carbide. Modern known processing techniques are partial sintering, direct foaming, replica, sacrificial template and bonding techniques. The full potential of these materials can be achieved when properties are directed over specified application. While eyeing over full potential it is highly dependent on processing techniques.

scholarly journals Energy Recovery Using Micro-Hydropower Technology in Water Supply Systems: The Case Study of the City of Fribourg

Water ◽  
2016 ◽  
Vol 8 (8) ◽  
pp. 344 ◽  
Author(s):  
Irene Samora ◽  
Pedro Manso ◽  
Mário Franca ◽  
Anton Schleiss ◽  
Helena Ramos
Keyword(s):  
Water Supply ◽  
Energy Recovery ◽  
Water Supply Systems ◽  
Supply Systems ◽  
The City
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