CHP based cooling for Mannheim
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1 CHP based cooling for Mannheim 34th Congress of Euroheat & Power, May 2009, Venice Dr. Stefan Holler
2 The municipal utility network of MVV Energie AG Seite 2 34th Congress of Euroheat & Power, May 2009
3 Business activities of the MVV Energie Group Core business Fields of growth Electricity Environmental energy District heating Gas Value-added services Water Total of 1.15 million customers in Germany and Eastern Europe for electricity, district heating and gas Ranked No. 5 among German district heating utilities in terms of volume (2006/07 FY) Seite 3 34th Congress of Euroheat & Power, May 2009
4 Agenda Introduction Cadastre of cooling Scenarios for a district cooling system Profitability analysis Conclusions Seite 4 34th Congress of Euroheat & Power, May 2009
5 Introduction Demand for building acclimatisation rises continuously. Several references throughout Europe show the technical feasibility of district cooling. Scope of the feasibility study is a district cooling system for a commercial area in Mannheim, Germany. Different concepts for cooling supply are compared in terms of technology energy efficiency profitability District Cooling gets growing attention in Europe Ecoheatcool, Seite 5 34th Congress of Euroheat & Power, May 2009
6 Different concepts for cooling supply District cooling with centralised chillers Decentralised chillers Cold water network Compression chillers Absorption chillers Cool thermal storage Cooling demand of commercial buildings Compression chillers Evaluation and comparison of technology and economics Seite 6 34th Congress of Euroheat & Power, May 2009
7 Evaluation of energy demand for cooling Electricity demand Electricity demand for cooling Building with compression chiller Building without cooling system April July (demand July) - (demand April) Ratio = annual average demand Seite 7 34th Congress of Euroheat & Power, May 2009
8 Cadastre of cooling Electrical energy demand for cooling of commercial buildings in Mannheim Selected site Seite 8 34th Congress of Euroheat & Power, May 2009
9 Site for district cooling system Key data for selected site Commercial area of 9 buildings 3 Coincidence factor: 0, Total installed cooling capacity: 18,2 MW Total length of the cold water system: 1,5 km. 5 Specific cooling capacity of system: 13,5 kw/m P C = W el COP t avg Annual full load utilization hours: 2000 h P c W el COP t avg cooling capacity, W difference of electricity demand between April and July, kwh coefficient-of-performance average operation time, h Seite 9 34th Congress of Euroheat & Power, May 2009
10 Scenarios for a district cooling system Scenario Compression Chillers Absorption Chillers Cool Thermal Storage #0 19 units - - V=6.500 m³ #1 6 x 2,6 MW 3 x 1,0 MW - - #2 5 x 2,6 MW - 5,5 MW #3 2 x 2,6 MW 3 x 2,6 MW 5,5 MW #4-5 x 2,6 MW 5,5 MW Seite 10 34th Congress of Euroheat & Power, May 2009
11 Load curve for combination of chillers and thermal storage System dimensioning principle for scenario #3. Load curve of a summer day with maximum load. Cool thermal storage Compression chiller Absorption chiller Seite 11 34th Congress of Euroheat & Power, May 2009
12 Results of profitability analysis Specific costs of cooling (according to German guideline VDI 2067) 100 [EUR/MWh] Specific costs of cooling Energy and water costs Operating costs Capital costs Szenario 0 Szenario 1 Szenario2 Szenario3 Szenario Seite 12 34th Congress of Euroheat & Power, May 2009
13 Conclusions A cadastre of cooling is a useful tool for identifying potential areas for a district cooling system. The new method of evaluating the cooling demand of a building from monthly electricity data gives plausible results. Under the specific premises of the chosen commercial district a cold water system with centralised centrifugal compressors and chilled water storage is the most economic alternative. High efficiency of modern compression chillers provides some advantages versus absorption chillers at current energy tariffs. Especialy, the application of a cool thermal storage enables the use of low energy tariffs for times of charging. Total costs of a district cooling system are very sensitive towards energy prices. A system with absorption chillers could only be profitable and achieve equal costs if a variable heat tariff is offered by the local district heating company Seite 13 34th Congress of Euroheat & Power, May 2009
14 Thank you! 34th Congress of Euroheat & Power, May 2009, Venice Dr. Stefan Holler
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