Computer simulation and evaluation of Alpine-type passively heated and cooled greenhouse system

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7079678

Akhter, M P

Greenhouse operations are labor, capital, and energy intensive. the energy cost for its operation vary in between 15 and 20% of the total production cost. A passively heated and cooled solar greenhouse design was analyzed to study its energy savings. An Alpine type passively heated and cooled greenhouse system was studied through a dynamic simulation model and measured greenhouse environmental data. The Alpine greenhouse had a built-in Trombe wall system to store thermal energy during the day, which is recovered during the cool night. The Trombe wall was responsible for the maintenance of inside greenhouse air temperature above the outside air temperature during cool winter nights. It offers an energy savings of 44.5 GJ/year. The greenhouse natural ventilation was also analyzed. The summer operation of the greenhouse required an additional ventilation of 500 m{sup 3}/min to keep the inside temperature from rising 2 to 3{degree}C above the outside ambient air temperature. The dynamic simulation model accurately predicted the greenhouse environment, and is a reliable tool to design, analyze or select a passively heated and cooled greenhouse system.

• Research Organization: Nebraska Univ., Lincoln, NE (USA)
• OSTI ID: 7079678
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140901* -- Solar Thermal Utilization-- Space Heating & Cooling
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
AMBIENT TEMPERATURE
BUILDINGS
COMPUTERIZED SIMULATION
CONVECTION
DESIGN
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
GREENHOUSES
HEAT TRANSFER
HEATING SYSTEMS
MASS TRANSFER
NATURAL CONVECTION
PASSIVE SOLAR COOLING SYSTEMS
PASSIVE SOLAR HEATING SYSTEMS
SIMULATION
SOLAR COOLING SYSTEMS
SOLAR EQUIPMENT
SOLAR HEATING SYSTEMS
TROMBE WALLS
VENTILATION
WALLS