Absorption equipment for solar air conditioning
An absorption chiller unit was added to the solar heating system in an elementary school in Timonium, Maryland, to supply the building with air conditioning. In a lithium bromide absorption chiller system, the refrigerant is vaporized by a generator as heat from the solar collectors or storage area is supplied. The vapor is condensed, then evaporated into a gas, and then absorbed by a solution of water and lithium bromide. When the cooling tower water circuit is allowed to decrease below 70-80/sup 0/F, the absorber-condenser circuit temperature is reduced, requiring a lower inlet hot water temperature to maintain an efficient coefficient of performance value. Thorough analysis of several factors is recommended in designing the solar cooling system. Load curves depicting times and ambient temperatures of system usage can be correlated with graphs representing the annual number of hours in a specific area that a range of ambient temperatures is sustained. An absorption chiller system can be tailored to the load capacity required by a system by calculating the equivalent heat source temperature (EHST) required from the solar collectors to provide the appropriate chilled water temperature (CHWT) and the equivalent cooling water temperature (ECWT). Graphical comparison of the EHST versus COP at various CHWT and ECWT values will permit proper sizing of the solar collection and storage system. The installation of a heat energy flywheel within the system is recommended. It was concluded that the feasibility of solar-powered air conditioning has been demonstrated, and that a solar system may be most financially justifiable for a commercial building when it is used to both heat and cool.
- OSTI ID:
- 6493202
- Journal Information:
- Build. Syst. Des.; (United States), Journal Name: Build. Syst. Des.; (United States) Vol. 75:4; ISSN BUSDB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140901* -- Solar Thermal Utilization-- Space Heating & Cooling
ABSORPTION REFRIGERATION CYCLE
AIR CONDITIONERS
AIR CONDITIONING
ALKALI METAL COMPOUNDS
AMBIENT TEMPERATURE
APPLIANCES
BROMIDES
BROMINE COMPOUNDS
BUILDINGS
CENTRAL REGION
DESIGN
EDUCATIONAL FACILITIES
ELECTRIC APPLIANCES
FLYWHEELS
HALIDES
HALOGEN COMPOUNDS
HEATING
LITHIUM BROMIDES
LITHIUM COMPOUNDS
LITHIUM HALIDES
MARYLAND
MECHANICAL ENERGY STORAGE EQUIPMENT
NORTH AMERICA
PERFORMANCE
SCHOOL BUILDINGS
SOLAR AIR CONDITIONERS
SOLAR AIR CONDITIONING
SOLAR COOLING SYSTEMS
SOLAR HEATING
SOLAR SPACE HEATING
SPACE HEATING
TEMPERATURE EFFECTS
USA