3. An industrial process has an annual average electricity demand of 2.45 GWh/yr and a heat...
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3. An industrial process has an annual average electricity demand of 2.45 GWh/yr and a heat demand of 12,016.8 GJ/yr. The heat demand is currently served by a gas-fired boiler and electricity is purchased from the local utility. It is proposed to install a CHP (combined heat and power) unit, comprising a Stirling engine and a waste heat recovery (WHR) boiler. The anticipated operational hours are 6,205.5 hours-per-year. Data: Existing gas boiler LHV efficiency-75% CHP unit electrical output - 600 kW. Annual average CHP unit LHV electrical heat rate=12,166.5 kJ/kWh, CHP unit usable heat output = 3,222 MJ/h CHP unit availability - 90% Electricity tariff-37.5 /MWh Natural gas tariff -2.50 /GJ (LHV) Installed cost of CHP unit - 384,000 Maintenance cost of CHP unit-8.57 /kWh, b) Outline the design and operation of the proposed CHP system using ample schematics (including an energy balance diagram for the unit) to illustrate your answer. (15 marks) Draw a 'balance of energy demand' comparing the existing and proposed energy supply systems. Calculate the overall efficiency, the annual heat utilization, and the net annual savings of the CHP unit; hence determine the payback period required. Briefly comment on the results. (15 marks) 3. An industrial process has an annual average electricity demand of 2.45 GWh/yr and a heat demand of 12,016.8 GJ/yr. The heat demand is currently served by a gas-fired boiler and electricity is purchased from the local utility. It is proposed to install a CHP (combined heat and power) unit, comprising a Stirling engine and a waste heat recovery (WHR) boiler. The anticipated operational hours are 6,205.5 hours-per-year. Data: Existing gas boiler LHV efficiency-75% CHP unit electrical output - 600 kW. Annual average CHP unit LHV electrical heat rate=12,166.5 kJ/kWh, CHP unit usable heat output = 3,222 MJ/h CHP unit availability - 90% Electricity tariff-37.5 /MWh Natural gas tariff -2.50 /GJ (LHV) Installed cost of CHP unit - 384,000 Maintenance cost of CHP unit-8.57 /kWh, b) Outline the design and operation of the proposed CHP system using ample schematics (including an energy balance diagram for the unit) to illustrate your answer. (15 marks) Draw a 'balance of energy demand' comparing the existing and proposed energy supply systems. Calculate the overall efficiency, the annual heat utilization, and the net annual savings of the CHP unit; hence determine the payback period required. Briefly comment on the results. (15 marks)
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a Design and Operation of the Proposed CHP System To design and illustrate the proposed CHP system we can use the following schematic diagram Stirling ... View the full answer
Related Book For
Macroeconomics Principles Applications And Tools
ISBN: 9780134089034
7th Edition
Authors: Arthur O Sullivan, Steven M. Sheffrin, Stephen J. Perez
Posted Date:
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