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Sökning: WFRF:(Kovacs Peter) > Högskolan Dalarna

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  • Haller, Michel Y., et al. (författare)
  • Dynamic whole system testing of combined renewable heating systems : The current state of the art
  • 2013
  • Ingår i: Energy and Buildings. - : Elsevier BV. - 0378-7788 .- 1872-6178. ; 66:Nov, s. 667-677
  • Tidskriftsartikel (refereegranskat)abstract
    • Objective For the evaluation of the energetic performance of combined renewable heating systems that supply space heat and domestic hot water for single family houses, dynamic behaviour, component interactions, and control of the system play a crucial role and should be included in test methods. Methods New dynamic whole system test methods were developed based on "hardware in the loop" concepts. Three similar approaches are described and their differences are discussed. The methods were applied for testing solar thermal systems in combination with fossil fuel boilers (heating oil and natural gas), biomass boilers, and/or heat pumps. Results All three methods were able to show the performance of combined heating systems under transient operating conditions. The methods often detected unexpected behaviour of the tested system that cannot be detected based on steady state performance tests that are usually applied to single components. Conclusion Further work will be needed to harmonize the different test methods in order to reach comparable results between the different laboratories. Practice implications A harmonized approach for whole system tests may lead to new test standards and improve the accuracy of performance prediction as well as reduce the need for field tests.
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  • Ollas, Patrik, et al. (författare)
  • Testing and evaluation of heat storage tanks according to Eco Design and transitional methods
  • 2014
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • In 2013 the Eco Design and Energy Labelling directives for water heaters and for space- and combination heaters came into force as regulations. Additionally, there is the option for “package labels” allowing for various combinations of e.g. solar collectors, boilers and storage tanks to be labelled by the supplier or the dealer. The package is then rated by means of energy calculations based on component data. In late 2013 SP Technical Research Institute of Sweden on behalf of the Swedish Energy Agency conducted a series of tests on five different hot water storage tanks available on the Swedish market for single-family houses. The objectives were to assess the feasibility of the transitional methods for storage testing and to provide an overview of the compliance of storage tanks on the Swedish market compared to the upcoming regulations. The tests were performed according to requirements for hot water stores as well as according to those for water heaters. Results point out some problems with the current methodology and show a need for improvement of tank performance for the tested models as only one out of five tanks got a rating C or better thus complying with the minimum requirements set by the regulation.
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