Solar-assisted heat pump-swimming pool synergistics for domestic heating
In this study for a 150m/sup 2/ home, clear performance and economic advantages are shown for a solar-assisted heat pump, providing domestic hot water and space heating and cooling, when the pump uses a year-round solar-heated swimming pool as a large thermal energy reservoir. The pool can cycle seasonably between 18 and 31/sup 0/C (64 and 88/sup 0/F), allowing year-round swimming, and provide an excellent water source for the heat pump and low cost, low temperature plastic solar panels operating at their near-optimum efficiency. The system has been optimized by examining the performance and cost characteristics of different glazed and unglazed solar panel collector (areas from 28 to 150m/sup 2/ and orientation from horizontal to 60/sup 0/ tilt) for sites in San Francisco Bay Area and in San Joaquin Valley. Actual experimental data has been used whenever possible, together with numerical simulations for performance. The optimum system was found to use 75m/sup 2/ of $44/m/sup 2/ unglazed collector at 48/sup 0/ tilt, a 300 GJ/year (30,000 Btu/h) capacity heat pump, and a standard size swimming pool with a solar blanket cover. Solar energy supplied about 85% of the energy requirements at $6.62/GJ ($6.62/10/sup 6/Btu) in July 1979 dollars. With 20 year financing (10% interest), the payout period (re-breakeven) was projected at 7 years and net savings in year 2000 at $42,701 (using the California State Tax Credit) compared against a conventional all-natural gas system. Discounting these savings back to July 1979, the present value of $6,350 would be equivalent to a 9.5% return on investment.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5697196
- Report Number(s):
- UCRL-83458; CONF-800101-1
- Resource Relation:
- Conference: Systems simulation and economics analysis conference, San Diego, CA, USA, 23 Jan 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SOLAR COOLING SYSTEMS
OPTIMIZATION
PERFORMANCE
SOLAR HEATING SYSTEMS
SOLAR WATER HEATERS
SOLAR-ASSISTED HEAT PUMPS
ECONOMICS
SWIMMING POOLS
SENSIBLE HEAT STORAGE
ANNUAL ENERGY STORAGE
CALIFORNIA
COST
COVERINGS
DESIGN
HOUSES
LIFE-CYCLE COST
NUMERICAL SOLUTION
PAYBACK PERIOD
SOLAR AIR CONDITIONERS
SOLAR AIR CONDITIONING
SOLAR SPACE HEATING
SOLAR WATER HEATING
THERMAL INSULATION
AIR CONDITIONERS
AIR CONDITIONING
APPLIANCES
BUILDINGS
ELECTRIC APPLIANCES
ENERGY STORAGE
GAS APPLIANCES
HEAT PUMPS
HEAT STORAGE
HEATERS
HEATING
HEATING SYSTEMS
NORTH AMERICA
RESIDENTIAL BUILDINGS
SOLAR HEATING
SPACE HEATING
STORAGE
SURFACE WATERS
USA
WATER HEATERS
WESTERN REGION
140901* - Solar Thermal Utilization- Space Heating & Cooling
140907 - Solar Thermal Utilization- Water Heating