Greenhouse floor heating system optimization using long-term thermal performance design curves

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Steady-state design curves suitable for the determination of long-term thermal performance of the floor heating system are presented in the paper. The dominant design variables considered in the system synthesis are: pipe diameter and spacing, floor depth, greenhouse main air mass temperature, hot water temperature, water flow rate and plant canopy density. The design curves are generated for a wide range of these parameter values. The nomograms are presented in terms of the greenhouse heat gain per unit floor area as a function of the floor depth, with other variables as parameters. The set of design curves also includes the values of the rate of change of heat flux with the floor depth. This facilitates in design optimization by reducing the three dimensional search in geometric parameter, namely, pipe diameter and spacing, and floor depth, to a two dimensional search. The utility of nomograms is illustrated through a design example for a floor heated greenhouse located in the midwest region of the United States. The optimum parameter values for the floor heating system are estimated using the classical calculus technique.

Original languageEnglish (US)
Pages (from-to)469-481
Number of pages13
JournalSolar Energy
Volume28
Issue number6
DOIs
StatePublished - Jan 1 1982

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Greenhouses
Heating
Nomograms
Pipe
Hot Temperature
Water
Heat flux
Flow rate
Air

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

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title = "Greenhouse floor heating system optimization using long-term thermal performance design curves",
abstract = "Steady-state design curves suitable for the determination of long-term thermal performance of the floor heating system are presented in the paper. The dominant design variables considered in the system synthesis are: pipe diameter and spacing, floor depth, greenhouse main air mass temperature, hot water temperature, water flow rate and plant canopy density. The design curves are generated for a wide range of these parameter values. The nomograms are presented in terms of the greenhouse heat gain per unit floor area as a function of the floor depth, with other variables as parameters. The set of design curves also includes the values of the rate of change of heat flux with the floor depth. This facilitates in design optimization by reducing the three dimensional search in geometric parameter, namely, pipe diameter and spacing, and floor depth, to a two dimensional search. The utility of nomograms is illustrated through a design example for a floor heated greenhouse located in the midwest region of the United States. The optimum parameter values for the floor heating system are estimated using the classical calculus technique.",
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Greenhouse floor heating system optimization using long-term thermal performance design curves. / Puri, Virendra.

In: Solar Energy, Vol. 28, No. 6, 01.01.1982, p. 469-481.

Research output: Contribution to journalArticle

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