Development of three-pipe DHC system with once-through domestic hot water supply

Technical Report · Fri Mar 01 00:00:00 EST 1991

OSTI ID:5556857

Wide use of computers in the United States and installation of different heat recovery systems in buildings reduce the requirements for heating. At the same time, heating, cooling and domestic hot water are often required simultaneously or in a daily cycle (morning heating and afternoon cooling). Also at any given time, some buildings in a service area may require heating, while others require cooling. The present method of serving these needs is the use of four-pipe system with supply and return pipes for heating and domestic hot water service and supply and return pipes for cooling. Both such systems typically circulate water from the district heating and cooling (DHC) plant through user heat exchangers back to the DHC plant in a closed cycle. In order to reduce costs, a three-pipe system is proposed. One pipe supplies hot water for heating and domestic hot water, the second pipe supplies chilled water, and the third pipe is a common return. The purpose of this project was to perform a preliminary investigation of the three-pipe system with once-through hot water supply. In order to accomplish this goal the following tasks have been performed: (1) Technical and economic analysis of the applicability of the three-pipe system in different climatic zones of the United States, (2) Assessment of the corrosion control methods and treatment in the DHC systems, (3) Assessment of the existing code requirements as applied to the three-pipe system with once-through water supply, and (4) Corrosion and water quality field tests in the Jamestown District Heating System as applicable to the once-through water supply. 10 refs., 11 figs.

• Research Organization: Joseph Technology Corp., Inc., Woodcliff Lake, NJ (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: FG01-89CE26595
• OSTI ID: 5556857
• Report Number(s): DOE/CE/26595-T1; ON: DE91014371
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
DISTRICT COOLING
DESIGN
DISTRICT HEATING
CLIMATES
CORROSION
COST
DRINKING WATER
ECONOMIC ANALYSIS
HEAT EXCHANGERS
PIPES
WATER HEATING
WATER QUALITY
CHEMICAL REACTIONS
COOLING
ECONOMICS
ENVIRONMENTAL QUALITY
HEATING
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
WATER
320603* - Energy Conservation
Consumption
& Utilization- Municipalities & Community Systems- Public Utilities- (1980-)