Energy consumption and heat recovery of refrigeration ... - Sabroe

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In terms of money the energy in kWh/year for the most efficient arenas can be shown as follows:
RefrigerationHeating of standsHeating and dehumidificationHot water for resurfacingDomestic hot waterLighting360,000 kWh/year232,000 kWh/year80,000 kWh/year48,000 kWh/year40,000 kWh/year40,000 kWh/year800000 kWh/yearand if you want to use the Finnish market price of energy according to www.energy.eu you can calculate thisin to money:Finnish price of energy 0.0559 kWhhttp://www.energy.eu/Refrigeration20,124 €/yearHeating of stands12,969 €/yearHeating and dehumidification 4,472 €/yearHot water for resurfacing 2,683 €/yearDomestic hot water2,236 €/yearLighting2,236 €/yearTotal expenditure 44,720 €/yearThe expenditure on hot water production can be reduced as shown in the calculation here under.Heat recoveryBasically the heat recovery systems allow you to collect the heat from the refrigeration systems warm side.The primary function of the refrigeration system is to keep the ice cold and not to create how water. The coldside and the temperature required here are therefore determined by the ice rink and the purpose of it. Thewarm side is defined by what the refrigeration system can do for you. There is a limit to how high thecondensing pressure can become because you lose capacity as the condensing temperature increases anddue to mechanical stresses in the system.In current ice rink systems part of the heat is recovered, but at a relative low level. If you are recovering thesuperheat of the compressed gas you can recover about 10% of the heat giving a temperature of about 60°Cgoing a capacity of about 30 kW going to 0 kW at 90°C.Alternatively you can use the condensing temperature between 20-40°C but with a capacity of 400 kW. Thehigher the condensing temperature becomes the lower the cooling capacity and the overall efficiencydecreases.A third possibility is to use a heat pump that can generate 70°C hot water using the warm side of the coolingsystem as heat source. Basically this is staging the compressor system and that has always been better forefficiency. This is the ultimate way to save money for space heating and for heating tap water also comparedto oil burners.We will demonstrate how it is possible to generate 70°C water at a competitive price using local prices forelectricity and natural gas.
Page 4 and 5: The assumptionsWe will assume that
Page 6: Heating, ventilation and dehumidifi

Energy consumption and heat recovery of refrigeration ... - Sabroe

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