Heating facilities for the city schools, Ephrata, Washington

Technical Report · Wed Dec 31 04:00:00 EST 1980

DOI:https://doi.org/10.2172/6869920· OSTI ID:6869920

The City of Ephrata, Washington has an existing well that has the capability of pumping 2200 gallons per minute of 86/sup 0/F water into the City drinking water system. To determine the economic practicality of using the City water to heat the schools, one school (Middle School) was selected for evaluation. Two cases were considered. Case 1 uses a two stage water-to-water heat pump to produce a 190/sup 0/F circulating hot water steam. This would be compatible with the existing system and essentially no retrofit costs for the room convective heating system would be incurred. Case 2 uses a single stage water-to-water heat pump to produce a 140/sup 0/F circulating hot water stream. Retrofit costs would incur for additional room convection equipment. In both cases the heat pump is sized to furnish the total heating and hot water requirements of the school. However, one of the existing boilers is left in place to serve as standby. The Middle School evaluation shows the single stage heat pump to be most cost effective, having a return on invested capital of about 19%. Projecting the single stage evaluation to include all the schools, the total conversion cost would be about $800,000. This includes a retrofit allowance of $100,000. The return on investment would be about 19%. Total annual savings in fuel oil consumption would be nearly 150,000 gallons, amounting to a first year savings of about $134,000. Peak water usage would be 1000 gallons per minute, about 45% of that available. Annual water usage would be about 90 million gallons, about 14% of the water used during 1978. This water would be returned to the drinking water system after extraction of heat. (MHR)

• Research Organization: Oregon Inst. of Tech., Klamath Falls (USA)
• DOE Contract Number: AC79-79BP15325
• OSTI ID: 6869920
• Report Number(s): DOE/BP/15325-T3
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
151000* -- Geothermal Energy-- Direct Energy Utilization
BUILDINGS
DRINKING WATER
ECONOMIC ANALYSIS
ECONOMICS
EDUCATIONAL FACILITIES
FEASIBILITY STUDIES
GEOTHERMAL HEATING
GEOTHERMAL HEATING SYSTEMS
GEOTHERMAL SPACE HEATING
Geothermal Legacy
HEAT PUMPS
HEATING
HEATING LOAD
HEATING SYSTEMS
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
SCHOOL BUILDINGS
SPACE HEATING
WATER
WATER SOURCE HEAT PUMPS