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Secondary HVAC Systems
Published in Moncef Krarti, Energy Audit of Building Systems, 2020
Waste heat recovery can be achieved by heat exchangers and can take several forms and shapes depending on the systems involved in the exchange of thermal energy. In particular, heat exchangers can be grouped into three categories depending on the temperature involved: Low-temperature heat exchangers with fluid temperatures less than 230°C (450°F). Applications of low-temperature heat exchangers are common in buildings such as preheating of ventilation air with exhaust air.Medium-temperature heat exchangers with fluid temperatures ranging from 230°C (450°F) to 650°C (1,200°F). Examples of medium-temperature heat recovery systems include incinerators.High-temperature heat exchangers with fluid temperatures above 650°C (1,200°F). Generally, the use of high-temperature heat exchangers is specific to industrial processes such as in steel/aluminum furnaces.
Energy: Waste Heat Recovery
Published in Brian D. Fath, Sven E. Jørgensen, Megan Cole, Managing Air Quality and Energy Systems, 2020
After the quantity of the waste stream is correctly determined, step two is to find the dollar value of the waste heat stream to determine how much capital cost a potential project can bear, or if it even makes economical sense. In all waste heat recovery projects, the heat recovered will displace a medium, such as steam, which would have to be generated using another piece of equipment, such as a boiler. This equipment likewise has a related efficiency, and the heat output is always less than the heat input. To determine the dollar value of the waste heat stream, use Eqs. 3 and 4 below: Value=Q×unit cost
Energy Management and Energy Conservation Opportunities
Published in Anil Kumar, Om Prakash, Prashant Singh Chauhan, Samsher, Energy Management, 2020
Anil Kumar, Om Prakash, Prashant Singh Chauhan, Samsher
Waste Heat RecoveryRetrieve heat from engine exhausts, drying oven exhausts, engine cooling water, hot flue gas, low pressure waste steam, boiler blowdown, etc.Retrieve heat from incinerator off-gas.Use waste heat for outside air heating, fuel oil heating, boiler feed water heating, etc.Chiller waste heat use to preheat hot water.Practice heat pumps.Practice absorption refrigeration.Use air-to-air exchangers, run-around systems, heat pipe systems and thermal wheels.
Membrane desalination of ballast water using thermoelectric energy from waste heat
Published in Journal of Marine Engineering & Technology, 2022
As mentioned earlier, the efficiency of main engines in marine vessels is around 50% despite numerous efforts to increase the fuel efficiency in the industry (Nguyen 2017). The remaining energy associated with the fuel is lost in different forms as shown in Figure 1(C). These include exhaust gases, cooling streams and radiation. Inclusion of waste heat recovery systems will provide opportunities for energy recovery while enhancing process efficiency, and reducing fuel consumption, thus minimising environmental emissions (Kristiansen et al. 2012). For example, by including a TEG unit, about 6% of total energy can be recovered (Figure 1D). It increases the overall fuel energy efficiency of the system to 55% (Kristiansen and Nielsen 2010).
A techno-economic survey on high- to low-temperature waste heat recovery cycles for UK glass sector
Published in International Journal of Green Energy, 2023
Narges H. Mokarram, Zhibin Yu, Muhammad Imran
According to data from the US, Germany, and Europe (EU-12), 750 MWe, 500 MWe, and 3000 MWe, respectively, of heat can be recovered through the production of electricity from industrial waste heat (Sovacool et al. 2021). Waste heat recovery has a particularly significant potential in some industries, such as cement, glass, steel, etc. The 0.5 MWe ORC power cycle at the OI (Owens-Illinois manufacturer) Glass container plant in Villotta di Chions, Italy, and the Siemens waste heat recovery sites in Germany, which convert 60% of their waste heat energy to power, are examples of waste heat recovery sites that have already been installed and are in operation in Europe (The European Container Glass Federation-) .
A new method to multi – objective optimization of shell and tube heat exchanger for waste heat recovery
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
With the growth of the human population and the global economy, the global energy need increases every year. However, fossil energy sources are decreasing gradually and environmental problems are increasing day by day. Therefore, waste heat recovery has been one of the key issues for reducing greenhouse gas emissions and increasing energy efficiency and savings. The main areas of use of waste heat in the industry are power plants, petroleum refineries, chemicals, cement, metal shaping and paper industries and the global waste heat recovery market size is estimated to be 63.42 billion American dollars in 2021 (Grand View Research, 2021).