Performance of evacuated tubular solar collectors in a residential heating and cooling system. Final report, 1 October 1978-30 September 1979
Operation of CSU Solar House I during the heating season of 1978-1979 and during the 1979 cooling season was based on the use of systems comprising an experimental evacuated tubular solar collector, a non-freezing aqueous collection medium, heat exchange to an insulated conventional vertical cylindrical storage tank and to a built-up rectangular insulated storage tank, heating of circulating air by solar heated water and by electric auxiliary in an off-peak heat storage unit, space cooling by lithium bromide absorption chiller, and service water heating by solar exchange and electric auxiliary. Automatic system control and automatic data acquisition and computation are provided. This system is compared with others evaluated in CSU Solar Houses I, II and III, and with computer predictions based on mathematical models. Of the 69,513 MJ total energy requirement for space heating and hot water during a record cold winter, solar provided 33,281 MJ equivalent to 48 percent. Thirty percent of the incident solar energy was collected and 29 percent was delivered and used for heating and hot water. Of 33,320 MJ required for cooling and hot water during the summer, 79 percent or 26,202 MJ were supplied by solar. Thirty-five percent of the incident solar energy was collected and 26 percent was used for hot water and cooling in the summer. Although not as efficient as the Corning evacuated tube collector previously used, the Philips experimental collector provides solar heating and cooling with minimum operational problems. Improved performance, particularly for cooling, resulted from the use of a very well-insulated heat storage tank. Day time (on-peak) electric auxiliary heating was completely avoided by use of off-peak electric heat storage. A well-designed and operated solar heating and cooling system provided 56 percent of the total energy requirements for heating, cooling, and hot water.
- Research Organization:
- Colorado State Univ., Fort Collins (USA). Solar Energy Applications Lab.
- DOE Contract Number:
- AS02-76CS32577
- OSTI ID:
- 6216150
- Report Number(s):
- COO-2577-20
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EVACUATED TUBE COLLECTORS
PERFORMANCE
HOUSES
SOLAR AIR CONDITIONING
SOLAR SPACE HEATING
SOLAR WATER HEATING
ABSORPTION REFRIGERATION CYCLE
AUXILIARY HEATING
CLIMATES
COLORADO
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CONTROL SYSTEMS
COOLING LOAD
COST
DATA ACQUISITION
EXPERIMENTAL DATA
HEAT EXCHANGERS
HEATING LOAD
SENSIBLE HEAT STORAGE
SOLAR FRACTION
TANKS
AIR CONDITIONING
BUILDINGS
CONTAINERS
DATA
ENERGY STORAGE
EQUIPMENT
EVACUATED COLLECTORS
HEAT STORAGE
HEATING
INFORMATION
NORTH AMERICA
NUMERICAL DATA
RESIDENTIAL BUILDINGS
ROCKY MOUNTAIN REGION
SIMULATION
SOLAR COLLECTORS
SOLAR EQUIPMENT
SOLAR HEATING
SPACE HEATING
STORAGE
USA
WATER HEATING
140901* - Solar Thermal Utilization- Space Heating & Cooling
140907 - Solar Thermal Utilization- Water Heating