RENEWABLES FOR HEATING AND COOLING

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RENEWABLES FOR HEATING AND COOLING ( renewables-for-heating-and-cooling )

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Figure 17 Annual collector yield of heat from glazed flat plate and evacuated tube collectors and from unglazed systems in operation at the end of 2005 by economic region.2 PJ / year 100 80 60 40 20 0 Solar cooling Glazed flat plate & evacuated tube Unglazed China + Taiwan Others Europe Japan United States + Canada Australia + New Zealand Data on solar-assisted cooling systems (SAC) are hard to find but the total capacity is likely to be very small. Currently Europe has at least 40 systems in service for air conditioning of buildings (25 of them in Germany) with a combined collector area of approximately 17 000 m2 and total capacity of 4.4 MWth. (REN21, 2007). Other assessments claim around 120-150 systems are operational in Europe with capacity over 12 MWth and collector area 36 000 m2 giving 3 m2/kW of cooling capacity mainly used 49 in buildings but some by industry such as for wine cooling (Piria, 2007; Henning, 2007). Other regions are also showing a growing interest in the promising application of SAC that is also attracting increasing interest from private customers, hotel owners and industry (Sarasin Bank, 2005). Significant market growth is expected once the costs are further reduced as a result of continued RD &D investment. Biomass The variety of biomass resources are widely distributed so much of the data on heat applications is very uncertain. Estimates of solid biomass used for the production of heat (excluding traditional biomass) range from 5 to 10 times the amount of the total heat produced from both solar and geothermal sources (REN 21, 2006). Total biomass resources used for heat, including liquid and gaseous forms, may reach far higher levels (Figure 18) (IPCC, 2007). This useful indication of biomass resource flows and bioenergy outputs shows around 35 EJ/yr of traditional biomass resources are consumed annually and a further 9.7 EJ/yr is used for “modern” bioenergy applications (IPCC, 2007). Of this around 3 EJ is thought to be used in the building and industry sectors for heat production, including the heat component from combined heat and power (CHP) and that used for the drying of agricultural and forest products. Biomass heating is mainly used in countries with a good resource availability and particularly where district heating systems are already utilised, mainly in Sweden, Austria, Finland, Denmark and Norway (Figure 19). Biomass used in individual buildings for water heating and space heating is not included in these figures since the data is difficult to obtain and typically not covered in national statistics. It is therefore very difficult to estimate the total value of biomass used for heating with more accuracy than is given above.

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