scholarly journals Heating and cooling of municipal buildings with waste heat from ground water

1980 ◽  
Author(s):  
D.S. Morgan ◽  
J. Hochgraf
Keyword(s):  
Ground Water ◽  
Waste Heat ◽  
Heating And Cooling

scholarly journals Competitiveness of the biomethane opposite with the CHP technology of biogas by definite plant size

2013 ◽  
pp. 5-9
Author(s):  
Ilona Barta-Juhász
Keyword(s):  
Heat Recovery ◽  
Waste Heat ◽  
District Heating ◽  
Cost Effective ◽  
Plant Size ◽  
Net Income ◽  
Renewable Energy Resources ◽  
Heating And Cooling ◽  
Emission Reduction Strategies ◽  
Cleaning Technology

The biogas sector has never before aroused so much attention as it does today. Combined heat and power (CHP) reliable and cost-effective technologies that are already making an important contribution to meeting global heat and electricity demand. Due to enhanced energy supply efficiency and utilisation of waste heat renewable energy resources, CHP, particularly together with district heating and cooling (DHC), is an important part of national and regional Green House Gas (GHG) emission reduction strategies. During my work I am going to use the basic data of a certain biogas plant than I assemble one model from that. Against the CHP technology I am going to plan a biogas cleaning-equipment. During my research it revealed, that in the case of a 1 MW output power plant it is not worthy to deal with biogas cleaning between national conditions. Investigating the quantity of heat recovery in the CHP technology it is obvious, that the net income at 1 m3 biogas is at least 72 times more than the cleaning technology (heat recovery is 0%).

Feasibility limits of using low-grade industrial waste heat in symbiotic district heating and cooling networks

2020 ◽  
Vol 22 (6) ◽  
pp. 1339-1357 ◽  
Author(s):  
Maurizio Santin ◽  
Damiana Chinese ◽  
Alessandra De Angelis ◽  
Markus Biberacher
Keyword(s):  
Industrial Waste ◽  
Waste Heat ◽  
District Heating ◽  
Low Grade ◽  
Heating And Cooling ◽  
Industrial Waste Heat

A Method of Power Generation From Low Temperature Medium

2002 ◽  
Author(s):  
Qingjun Cai ◽  
Chung-Lung Chen
Keyword(s):  
Waste Heat ◽  
Stable Operation ◽  
Vapor Bubbles ◽  
Power Generator ◽  
New Device ◽  
Heating And Cooling ◽  
Higher Power ◽  
Long Time ◽  
Generating Capacity ◽  
Cooling Tube

For a long time, how to utilize waste heat to generate electricity has been an interesting and challenging field for energy scientists. This paper presents a new method, ferrofluid power generator (FPG), which takes advantage of waste heat or solar energy to generate electricity in a multiple heating and cooling tube with alternate ferrofluid slug and vapor bubble structures. Based on this method, a new device, a thermomagnetic engine (TME) composed of a straight vacuum tube, a current induced coil, and magnet & ferrofluid slugs (MFS), was designed. Experimental results show that the expanding vapor bubbles push MFSs to generate drastic and continuous oscillating movements under the effect of heat. The pulse voltage signals from the induced coil demonstrate that the TME has a practical structure, potentially higher power generating capacity, and a stable operation.

scholarly journals Study of Hybrid PVA/MA/TEOS Pervaporation Membrane and Evaluation of Energy Requirement for Desalination by Pervaporation

2018 ◽  
Vol 15 (9) ◽  
pp. 1913 ◽  
Author(s):  
Zongli Xie ◽  
Derrick Ng ◽  
Manh Hoang ◽  
Jianhua Zhang ◽  
Stephen Gray
Keyword(s):  
Thermal Energy ◽  
Waste Heat ◽  
Energy Requirement ◽  
Electrical Power ◽  
Electrical Energy ◽  
Commercial Application ◽  
Heating And Cooling ◽  
Pervaporation Membrane ◽  
Multi Stage ◽  
Multiple Effect Distillation

Desalination by pervaporation is a membrane process that is yet to be realized for commercial application. To investigate the feasibility and viability of scaling up, a process engineering model was developed to evaluate the energy requirement based on the experimental study of a hybrid polyvinyl alcohol/maleic acid/tetraethyl orthosilicate (PVA/MA/TEOS) Pervaporation Membrane. The energy consumption includes the external heating and cooling required for the feed and permeate streams, as well as the electrical power associated with pumps for re-circulating feed and maintaining vacuum. The thermal energy requirement is significant (e.g., up to 2609 MJ/m3 of thermal energy) and is required to maintain the feed stream at 65 °C in recirculation mode. The electrical energy requirement is very small (<0.2 kWh/m3 of required at 65 °C feed temperature at steady state) with the vacuum pump contributing to the majority of the electrical energy. The energy required for the pervaporation process was also compared to other desalination processes such as Reverse Osmosis (RO), Multi-stage Flash (MSF), and Multiple Effect Distillation (MED). The electrical energy requirement for pervaporation is the lowest among these desalination technologies. However, the thermal energy needed for pervaporation is significant. Pervaporation may be attractive when the process is integrated with waste heat and heat recovery option and used in niche applications such as RO brine concentration or salt recovery.

Thermal Performance of a Combined Heat, Cooling, and Power Microturbine System

2009 ◽  
Author(s):  
Hannu E. Ja¨a¨skela¨inen ◽  
James S. Wallace
Keyword(s):  
Waste Heat ◽  
Lithium Bromide ◽  
Hot Water ◽  
Cooling Mode ◽  
University Of Toronto ◽  
Heating And Cooling ◽  
Thermal Output ◽  
Operating Constraints ◽  
The University ◽  
Heating Mode

A 240 kWe integrated microturbine chiller/heater system was installed on the campus of the University of Toronto at Mississauga in 2005 to provide heating or cooling in combination with electric power generation. The system consists of four 60 kWe microturbines fueled by natural gas and a 110 ton lithium bromide absorption chiller that utilizes waste heat from the microturbines. The chiller can be operated in cooling mode to supply chilled water in summer for cooling or in heating mode to supply hot water (60°C) in winter for heating. Tests were conducted in both heating and cooling mode to evaluate the effectiveness of heat recovery and results are presented for both modes of operation. However, operating constraints imposed by this particular installation prevent full utilization of thermal output in both heating and cooling mode. Recommendations are provided to guide future installations to make full use of the equipment’s potential.

scholarly journals Techno-economic study of an energy sharing network comprised of a data centre and MURBs for cold climate

2021 ◽  
Author(s):  
Adreon Raymond Murphy
Keyword(s):  
Financial Analysis ◽  
Waste Heat ◽  
Residential Buildings ◽  
Internal Heat ◽  
Cold Climate ◽  
Efficient Operation ◽  
Data Centre ◽  
Heating And Cooling ◽  
Free Cooling ◽  
Energy Sharing

Due to their significant internal heat gain resulting from computer server banks, data centres require cooling year-round, creating an opportunity to transport the waste heat to heat-deficient neighbouring buildings. This thesis evaluates the quantity of multi-unit residential buildings (MURBs) that should be connected to a given data centre in order to maximize the portion of shared energy which provides the MURBs’ heating energy and the data centre’s cooling energy simultaneously. The thesis then evaluates the financial viability and greenhouse gas (GHG) emissions of three different methods with which energy can be shared from a data centre to surrounding MURBs in a community energy network (CEN). The first method, called the Energy Sharing System involves using a heat pump to produce heating and cooling at the same time for the MURBs and the data centre. The second, called the One-Borefield System, has the same energy sharing aspect as the first, with additional heating and cooling coming from geo-exchange. The third method, called the Two-Borefield System, is an innovative approach to geo-exchange, which uses two separate borefields to achieve free cooling, while also incorporating the energy sharing base. The investigation finds that the optimal MURB area that should be connected to a 4 MW cooling load data centre is 110,000 m2 for the Toronto (Canada) climate. The financial analysis shows that the Energy Sharing System was the most profitable, with a 11.9% 30-year after-tax internal rate of return (IRR). This scenario resulted in the most efficient operation, achieving an overall 4.3 COP for heating and free cooling. This scenario would reduce the MURBs’ annual heating related emissions by 2289 tonnes CO2e (57%) and reduce the data centre’s annual space cooling related emissions by 80 tonnes CO2e (53%).

scholarly journals Development of Multi use Refrigeration System

2019 ◽  
Vol 8 (2) ◽  
pp. 2387-2390
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Point Of View ◽  
Small Scale ◽  
Refrigeration Cycle ◽  
Refrigeration System ◽  
Conservation Of Energy ◽  
Heating And Cooling ◽  
Vapour Compression

Conservation of energy is the important factor from global point of view. Waste heat recovery has become significantly necessary and instant effort should be made to conserve this waste energy. Presently the refrigerator system rejects a lot of heat through condenser. This heat can be used for a variety of useful purposes. A multiuse refrigeration setup has been developed in which, both heating and cooling will be done simultaneously with the help of single vapour compression refrigeration cycle. It has a waste heat recovery system from the compressor for heating effect. Here without disturbing refrigeration cycle, the waste heat energy is used for useful work. The study has shown that such a system is technically feasible and economically viable. This concept has a scope of applications in variety of products such as air conditioners, freezers, water coolers and small scale refrigeration plants. This project leads to hybrid heating and cooling application with same vapour compression refrigeration system

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