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Evaluation and control of thermal losses and solar fraction in a hot water solar system

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  • Paolo Valdiserri

Abstract

Water heating for domestic needs contributes significantly to energy demands in the residential sector. The paper reports an energetic analysis of a solar hot water system performed on a dwelling located in different European cities. The study is focused on a group of apartments, where the domestic hot water is provided by a solar system coupled with a storage tank. A recirculation loop, composed by a pump and a system of pipes from the tank to the more distant apartment is also considered in the study. The loop overcomes the problem of long waiting times for hot water for the user by keeping it flowing inside the system. Since the recirculation loop is compulsory in this kind of plants, a dynamic energetic analysis is performed in order to analyze the pipe heat loss influence on the solar fraction. Dynamic simulations are performed using TRNSYS by interrupting the flow in the recirculation loop during the night and monitoring the temperature in the circulation loop. The study shows the sizing process of the whole system, the variation of the solar fraction and heat loss fraction for all the analyzed cases.

Suggested Citation

  • Paolo Valdiserri, 2018. "Evaluation and control of thermal losses and solar fraction in a hot water solar system," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 13(3), pages 260-265.
    • Handle: RePEc:oup:ijlctc:v:13:y:2018:i:3:p:260-265.
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    File URL: http://hdl.handle.net/10.1093/ijlct/cty025
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    Citations

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    Cited by:

    1. Chang-Hyun Park & Yu-Jin Ko & Jong-Hyun Kim & Hiki Hong, 2020. "Greenhouse Gas Reduction Effect of Solar Energy Systems Applicable to High-rise Apartment Housing Structures in South Korea," Energies, MDPI, vol. 13(10), pages 1-13, May.
    2. Edoardo Alessio Piana & Benedetta Grassi & Laurent Socal, 2020. "A Standard-Based Method to Simulate the Behavior of Thermal Solar Systems with a Stratified Storage Tank," Energies, MDPI, vol. 13(1), pages 1-22, January.
    3. Silvia Cesari & Paolo Valdiserri & Maddalena Coccagna & Sante Mazzacane, 2020. "The Energy Saving Potential of Wide Windows in Hospital Patient Rooms, Optimizing the Type of Glazing and Lighting Control Strategy under Different Climatic Conditions," Energies, MDPI, vol. 13(8), pages 1-24, April.
    4. Anh Tuan Le & Liang Wang & Yang Wang & Ngoc Tuan Vu & Daoliang Li, 2020. "Experimental Validation of a Low-Energy-Consumption Heating Model for Recirculating Aquaponic Systems," Energies, MDPI, vol. 13(8), pages 1-20, April.

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