Single-Pass Open-Loop solar thermal energy systems: On maximum energy delivery by variable flow rate

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

For single-pass open-loop solar thermal energy systems, in which the flow rate can vary with radiation but is constrained to have a given annual average, an upper bound is derived for the yearly energy delivery. Compared to the corresponding constant flow rate, single-pass open-loop system, the upper bound for additional yearly delivery is found to be negligible for solar systems with practical design parameters. This implies that the sophistication and expense involved in searching for, and implementing, optimal variable (radiation-dependent) collector flow rate strategies for these systems may not be worth the effort. The sensitivity of this upper bound to climatic and collector characteristics is determined analytically, and is illustrated by several numerical examples. The results derived are general in that they apply to all collector types.

Original languageEnglish
Pages (from-to)273-276
Number of pages4
JournalJournal of Solar Energy Engineering, Transactions of the ASME
Volume107
Issue number4
DOIs
StatePublished - 1 Jan 1985

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology

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