Analysis and summary of a solar air collector-groundwater heat storage-greenhouse heating system

Conference · Thu Jan 01 04:00:00 EST 1981 · ASAE Publ.; (United States)

OSTI ID:6486702

Dale, A C; Puri, V M; Barrett, J R; Hammer, P A

An air-type solar energy collector with reflective wings at the top and bottom was developed and adapted to heat a soil and groundwater heat storage from which energy was reclaimed to heat a greenhouse. Collector efficiency correlation for summer and winter months are presented for seasonal collector tilts of 30/sup 0/ and 60/sup 0/, respectively. The collector performance data and correlations show that summer performance on an average was 30 percent better than winter months. In addition, a model for the determination of solar radiation augmentation due to reflectors is presented. The model shows total radiation increments of 25 percent and 18 percent for summer and winter seasons, compared to average reported value of 22 percent. A three dimension finite difference unsteady state model for determining heat transfer to and from pipes buried in soil was developed. Validation was done by comparing the actual and pedicted hourly soil temperature distribution values for typical summer and winter days. The standard deviation between actual and predicted hourly soil temperature values was + 0.83/sup 0/C. The greenhouse subsystem performance was documented by showing the weekly breakdown of a typical winter season heating requirement supplied by the solar and auxiliary heating systems. Only about 5 percent of the heating requirement was supplied by the solar system. This low system efficiency was attributed to the inability of storage unit to retain heat for an extended period of time due to rapid heat loss to the surroundings.

• Research Organization: Purdue Univ., West Lafayette, IN
• OSTI ID: 6486702
• Report Number(s): CONF-8009144-(Vol.2)
• Conference Information: Journal Name: ASAE Publ.; (United States) Journal Volume: 4-81
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140901* -- Solar Thermal Utilization-- Space Heating & Cooling
AIR HEATERS
BUILDINGS
CONCENTRATING COLLECTORS
DESIGN
ENERGY STORAGE
ENERGY SYSTEMS
EQUIPMENT
FINITE DIFFERENCE METHOD
GREENHOUSES
GROUND WATER
HEAT STORAGE
HEATERS
HEATING
HEATING SYSTEMS
HYDROGEN COMPOUNDS
ITERATIVE METHODS
NUMERICAL SOLUTION
OXYGEN COMPOUNDS
PERFORMANCE
SENSIBLE HEAT STORAGE
SOILS
SOLAR AIR HEATERS
SOLAR COLLECTORS
SOLAR CONCENTRATORS
SOLAR EQUIPMENT
SOLAR HEATING
SOLAR HEATING SYSTEMS
SOLAR REFLECTORS
SOLAR SPACE HEATING
SPACE HEATING
STORAGE
WATER