By-Pass Blending Station: An Innovative Secondary In-Building Pump System for District Heating and Cooling Systems

Solar Energy ◽  
2004 ◽  
Author(s):  
M. Liu ◽  
D. Barnes ◽  
K. Bunz ◽  
N. Rosenberry
Keyword(s):  
Distribution Systems ◽  
Pump Energy ◽  
District Heating ◽  
Water Systems ◽  
Pump System ◽  
Cooling Systems ◽  
Heating Systems ◽  
Heating And Cooling ◽  
Secondary Systems ◽  
Pump Head

An innovative secondary in-building pump system called the By-pass Blending Station (BBS) has been developed to reduce building pump energy consumption and maintain the desired return water temperatures in district heating and cooling systems. This method applies where district systems provide sufficient pump head for in-building water circulation. The BBS moves only the returned by-pass flow. Therefore, it uses less pump energy than the ASHRAE recommended method, which moves the entire building water flow by using in-building pump. The pump in the BBS is smaller than that of the ASHRAE recommended in-building secondary pump system. The BBS can be used in both constant and variable flow secondary systems. This paper compares the ASHRAE recommended secondary in-building pump with BBS systems using chilled water systems. The BBS only applies to cases where the primary distribution systems provide sufficient pump head for in-building circulation, which are typically found in commercial district cooling and heating systems.

Power Piping

2010 ◽  
Keyword(s):  
High Temperature ◽  
District Heating ◽  
Cooling Systems ◽  
Heating Systems ◽  
Geothermal Heating ◽  
Heating And Cooling ◽  
Piping Systems ◽  
Minimum Requirements ◽  
Pressure Water ◽  
Temperature Water

ASME B31.1 prescribes minimum requirements for the design, materials, fabrication, erection, test, inspection, operation, and maintenance of piping systems typically found in electric power generating stations, industrial and institutional plants, geothermal heating systems, and central and district heating and cooling systems.It also covers boiler-external piping for power boilers and high-temperature, high pressure water boilers in which steam or vapor is generated at a pressure of more than 15 psig; and high temperature water is generated at pressures exceeding 160 psig and/or temperatures exceeding 250 degrees F.

Power Piping

2012 ◽  
Keyword(s):  
High Temperature ◽  
District Heating ◽  
Cooling Systems ◽  
Heating Systems ◽  
Geothermal Heating ◽  
Heating And Cooling ◽  
Piping Systems ◽  
Minimum Requirements ◽  
Pressure Water ◽  
Temperature Water

ASME B31.1 prescribes minimum requirements for the design, materials, fabrication, erection, test, inspection, operation, and maintenance of piping systems typically found in electric power generating stations, industrial and institutional plants, geothermal heating systems, and central and district heating and cooling systems.It also covers boiler-external piping for power boilers and high-temperature, high pressure water boilers in which steam or vapor is generated at a pressure of more than 15 psig; and high temperature water is generated at pressures exceeding 160 psig and/or temperatures exceeding 250 degrees F.

Power Piping

2014 ◽  
Keyword(s):  
High Temperature ◽  
District Heating ◽  
Cooling Systems ◽  
Heating Systems ◽  
Geothermal Heating ◽  
Heating And Cooling ◽  
Piping Systems ◽  
Minimum Requirements ◽  
Pressure Water ◽  
Temperature Water

ASME B31.1 prescribes minimum requirements for the design, materials, fabrication, erection, test, inspection, operation, and maintenance of piping systems typically found in electric power generating stations, industrial and institutional plants, geothermal heating systems, and central and district heating and cooling systems.It also covers boiler-external piping for power boilers and high-temperature, high pressure water boilers in which steam or vapor is generated at a pressure of more than 15 psig; and high temperature water is generated at pressures exceeding 160 psig and/or temperatures exceeding 250 degrees F.

Power Piping

2010 ◽  
Keyword(s):  
High Temperature ◽  
District Heating ◽  
Cooling Systems ◽  
Heating Systems ◽  
Geothermal Heating ◽  
Heating And Cooling ◽  
Piping Systems ◽  
Minimum Requirements ◽  
Pressure Water ◽  
Temperature Water

ASME B31.1 prescribes minimum requirements for the design, materials, fabrication, erection, test, inspection, operation, and maintenance of piping systems typically found in electric power generating stations, industrial and institutional plants, geothermal heating systems, and central and district heating and cooling systems.It also covers boiler-external piping for power boilers and high-temperature, high pressure water boilers in which steam or vapor is generated at a pressure of more than 15 psig; and high temperature water is generated at pressures exceeding 160 psig and/or temperatures exceeding 250 degrees F.

scholarly journals Dynamic equation-based thermo-hydraulic pipe model for district heating and cooling systems

2017 ◽  
Vol 151 ◽  
pp. 158-169 ◽  
Author(s):  
B. van der Heijde ◽  
M. Fuchs ◽  
C. Ribas Tugores ◽  
G. Schweiger ◽  
K. Sartor ◽  
...  
Keyword(s):  
Dynamic Equation ◽  
District Heating ◽  
Cooling Systems ◽  
Heating And Cooling ◽  
Pipe Model

scholarly journals A Novel Method for Designing Fifth-Generation District Heating and Cooling Systems

2021 ◽  
Vol 246 ◽  
pp. 09001
Author(s):  
Marwan Abugabbara ◽  
Jonas Lindhe
Keyword(s):  
Analytical Solution ◽  
District Heating ◽  
Innovative Technology ◽  
Complete Agreement ◽  
Fluid Temperature ◽  
Existing Buildings ◽  
Cooling Systems ◽  
Heating And Cooling ◽  
Fifth Generation ◽  
Novel Method

District heating and cooling systems have been undergoing continuous development and have now reached the fifth-generation. In this innovative technology, connected buildings share local excess energy that otherwise would be wasted, which consequently reduces primary energy demands and carbon emissions. To date, the issue of implementing fifth-generation district systems on existing buildings has received scant attention, and our research addresses this challenging gap by proposing a novel method for designing these systems. We first explain the possible thermal interactions between connected buildings, and then present an analytical solution for the network energy balance, pipe design, and the prediction of fluid temperature under a fixed temperature difference control strategy. The analytical solution was validated against numerical simulations performed on 11 existing buildings located in Lund, Sweden using Modelica models. A diversity index metric between heating and cooling demands was also included in these models to assess the efficiency of the district system in the building cluster. The results from the analytical and numerical solutions were in complete agreement since Modelica is an equation-based modelling language. The developed models pave the way towards future investigations of different temperature control strategies and new business models that arise from the shift to the fifth-generation.

Solar space heating with air and liquid systems

1980 ◽  
Vol 295 (1414) ◽  
pp. 349-359
Keyword(s):  
Energy Savings ◽  
Solar Heating ◽  
Performance Data ◽  
Space Heating ◽  
Cooling Systems ◽  
Heating Systems ◽  
Fuel Prices ◽  
Heating And Cooling ◽  
Liquid Systems ◽  
And Storage

Seasonal and annual performance data are available on only a limited number of the several thousand solar space heating systems now in operation. The emerging information indicates that most of the heat required in buildings can be supplied by solar energy delivered from flat-plate collectors and stored overnight in tanks of water and bins of rock pebbles. Numerous mechanical and operational problems, mainly in liquid collection and storage systems, demand attention. Annual costs of solar heating equipment and its installation usually exceed current values of energy savings, but fuel prices are expected to escalate at rates which often favour solar purchase today. Detailed performance data on several types of solar heating and cooling systems in buildings of identical design are presented, compared and interpreted. Maintenance and repair requirements are noted and contrasted, and forecasts of use in various applications are presented.

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