Application of Process Integration to the Synthesis of Heat and Power Utility Systems Including Combined Heat and Power (CHP) and Industrial Heat Pumps

2013 ◽  
pp. 168-200 ◽  
Author(s):  
Thore Berntsson ◽  
Simon Harvey ◽  
Matteo Morandin
Keyword(s):  
Process Integration ◽  
Combined Heat And Power ◽  
Heat Pumps ◽  
Power Utility ◽  
Utility Systems

scholarly journals Analysis of Cooperation Between Central Power Utility and Dispersed Cogeneration Systems Through Time-of-Use Pricing

1998 ◽  
Author(s):  
Ryohei Yokoyama ◽  
Koichi Ito
Keyword(s):  
Load Factor ◽  
Theory Approach ◽  
Power Utility ◽  
Utility Systems ◽  
Utility System ◽  
Cogeneration System ◽  
Annual Total ◽  
Upper Level ◽  
Time Of Use Pricing ◽  
Cooperative Relationship

Because of an increase in peak electricity demand during summer daytime, a decrease in the annual load factor of power generation facilities has been one of the serious problems for central power utility systems. On the other hand, utility-connected dispersed cogeneration systems have been increasingly installed for energy supply in industrial and commercial sectors. This paper analyzes the cooperative relationship between power utility and cogeneration systems through time-of-use pricing. A game-theory approach in mathematical programming, i.e., bilevel programming, is applied to attain this objective. At the upper level, a power utility system determines the time-of-use rates for demand and energy charges of electricity purchased by a cogeneration system to maximize its load factor, and at the lower level, a cogeneration system determines its design and operation to minimize its annual total cost. Through a basic case study, it has been shown how the time-of-use rates are determined to attain the cooperative relationship between power utility and cogeneration systems.

scholarly journals Critical Analysis of Process Integration Options for Joule-Cycle and Conventional Heat Pumps

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 635 ◽  
Author(s):  
Limei Gai ◽  
Petar Sabev Varbanov ◽  
Timothy Gordon Walmsley ◽  
Jiří Jaromír Klemeš
Keyword(s):  
Heat Pump ◽  
Process Integration ◽  
Waste Heat ◽  
Correct Choice ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Large Temperature ◽  
Temperature Changes ◽  
Application Range ◽  
Source And Sink

To date, research on heat pumps (HP) has mainly focused on vapour compression heat pumps (VCHP), transcritical heat pumps (TCHP), absorption heat pumps, and their heat integration with processes. Few studies have considered the Joule cycle heat pump (JCHP), which raises several questions. What are the characteristics and specifics of these different heat pumps? How are they different when they integrate with the processes? For different processes, which heat pump is more appropriate? To address these questions, the performance and integration of different types of heat pumps with various processes have been studied through Pinch Methodology. The results show that different heat pumps have their own optimal application range. The new JCHP is suitable for processes in which the temperature changes of source and sink are both massive. The VCHP is more suitable for the source and sink temperatures, which are near-constant. The TCHP is more suitable for sources with small temperature changes and sinks with large temperature changes. This study develops an approach that provides guidance for the selection of heat pumps by applying Process Integration to various combinations of heat pump types and processes. It is shown that the correct choice of heat pump type for each application is of utmost importance, as the Coefficient of Performance can be improved by up to an order of magnitude. By recovering and upgrading process waste heat, heat pumps can save 15–78% of the hot utility depending on the specific process.

scholarly journals Integration of Different Individual Heating Scenarios and Energy Storages into Hybrid Energy System Model of China for 2030

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2083 ◽  
Author(s):  
Muhammad Faizan Tahir ◽  
Haoyong Chen ◽  
Muhammad Sufyan Javed ◽  
Irfan Jameel ◽  
Asad Khan ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Natural Gas ◽  
Fuel Consumption ◽  
Energy System ◽  
Combined Heat And Power ◽  
Heat Pumps ◽  
Vital Role ◽  
Hybrid Energy System ◽  
Energy System Model ◽  
Hybrid Energy

Traditional energy supply infrastructures are on the brink of facing a major transformation due to energy security concerns, environment pollution, renewable energy intermittency and fossil fuel scarcity. A hybrid energy system constitutes the integration of different energy carriers like electricity, heat and fuel which play a vital role in addressing the above challenges. Various technological options like combined heat and power, heat pumps, electrolysers and energy storages ease out multiple carrier integration in an energy hub to increase system flexibility and efficiency. This work models the hybrid energy system of China for the year 2030 by using EnergyPLAN. Atmosphere decarbonization is achieved by replacing conventional coal and natural gas boilers with alternative individual heating sources like hydrogen operated micro combined heat and power natural gas micro combined heat and power and heat pumps. Moreover, rockbed storage as well as single and double penstock pumped hydro storages are added in the proposed system in order to cope with the stochastic nature of intermittent renewable energy such as wind and solar photovoltaic. The technical simulation strategy is employed to analyze the optimal combination of energy producing components by determining annual costs, fuel consumption and CO2 emissions. The results substantiate that a heat pump and double penstock pumped hydro storage addition to the individual heating and electricity network not only proves to be an economically viable option but also reduces fuel consumption and emissions.

Increasing the Flexibility of Combined Heat and Power Plants With Heat Pumps and Thermal Energy Storage

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Eike Mollenhauer ◽  
Andreas Christidis ◽  
George Tsatsaronis
Keyword(s):  
Thermal Energy ◽  
Electricity Market ◽  
Power Plants ◽  
Combined Heat And Power ◽  
Heat Pumps ◽  
Optimal Operation ◽  
Mixed Integer ◽  
Steam Turbines ◽  
Mixed Integer Linear Program ◽  
District Heating System

Combined heat and power (CHP) plants are efficient regarding fuel, costs, and emissions compared to the separate generation of heat and electricity. Sinking revenues from sales of electricity due to sinking market prices endanger the economically viable operation of the plants. The integration of heat pumps (HP) and thermal energy storages (TESs) represents an option to increase the flexibility of CHP plants so that electricity can be produced only when the market conditions are favorable. The investigated district heating system is located in Germany, where the electricity market is influenced by a high share of renewable energies. The price-based unit-commitment and dispatch problem is modeled as a mixed integer linear program (MILP) with a temporal resolution of 1 h and a planning horizon of 1 yr. This paper presents the optimal operation of a TES unit and a HP in combination with CHP plants as well as synergies or competitions between them. Coal and gas-fired CHP plants with back pressure or extraction condensing steam turbines (STs) are considered, and their results are compared to each other.

Application of Cloud Computing in Electric Power Utility Systems

2020 ◽  
pp. 229-247
Author(s):  
Radoslav M. Raković
Keyword(s):  
Cloud Computing ◽  
Information Security ◽  
Electric Power ◽  
General Purpose ◽  
Business Systems ◽  
Power Utility ◽  
Advantages And Disadvantages ◽  
Utility Systems ◽  
Power Utilities

The concept of “Cloud computing” became very interesting in recent years because it enables optimization of resources used and costs paid for it. Considering all advantages, this approach is applied widely in business systems of general purpose. In recent years, in literature it is possible to find considerations related to application of this approach in corporate systems as electric power utilities. Having in mind that such types of systems represent infrastructure ones that have great impact to the security of people and utilities, a very important question related to information security should be seriously considered. This chapter discusses advantages and disadvantages of application of cloud computing in electric power utility systems.

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