Heat Exchanger World Magazine December 2024 | Page 35

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District Heating
“ The change for residents is minimal . They still have a thermostat , a meter and a white box on the wall that produces heat . Their hot water flows from the shower , and their radiators heat up as usual . The only difference is the absence of a gas meter and gas supply , which has been replaced by a hot water supply .” - Paul Steen , Head of Business Development ( North ) at Vattenfall Heat UK
services , and renewable energy solutions . The company offers a wide range of services focused on development and implementation of sustainable energy solutions , including renewable energy projects and energy efficiency improvements , like Shawfair town .
A future-proof solution for multiple scenarios Consulting engineers Hulley & Kirkwood designed the substation solution which uses SWEP B439Hx240 Brazed Plate Heat Exchangers . Each substation has two units , one in service and one in stand-by , and are designed for approximately up to 1,200 kW each . The design was standardized to minimize the number of
Keeping the substation in safe housing .
variants . Currently , four substations are in operation with a total of ten substations planned to supply the needs of Shawfair Town . The temperatures in the heat network are 65 ° C flow and 35 ° C return on the primary side and 60 ° C flow and 30 ° C return on the secondary side . These operating temperatures make the SWEP heat exchangers suitable for the low delta T and stable return temperature as SWEP BPHEs has no moving parts . Also operating pressures of up to 15 bar favor brazed plate heat exchangers instead of more traditional solutions . Hulley & Kirkwood chose SWEP Brazed Plate Heat Exchangers for the solution due to their small footprint and maintenance free design , as well as the technical support from software tool SSP G8 and SWEP experts . As the project was being completed in stages , each substation had to handle five different load and temperature scenarios . The ability to standardize the design using SWEPs ‘ offthe-shelf ’ products makes future maintenance and expansion even more efficient . For consumers , the switch from gas boilers to the heat network system will be effortless . A GBP 120m business plan for further development has been approved by Midlothian Energy Limited for further expansion of the heating network .
Thermal storage vessels that each store 100,000L hot water ( and space for a future 4th ) to satisfy peak demand for the heat network .
Midlothian Energy Limited
Midlothian Energy Limited ( MEL ) is a joint venture between Vattenfall and Midlothian Council with the aim of supplying low-carbon heat to new homes in Midlothian whilst progressing a variety of other energy projects . Vattenfall is working with Scottish FES Group to provide the new Shawfair Town development in Midlothian with low carbon heating via a heat network . The initial phase of the network will supply the 3000 homes plus education and retail properties using waste heat from FFC Environment ’ s Millerhill RERC . For more info , visit swep . net and Vattenfall . co . uk www . heat-exchanger-world . com Heat Exchanger World December 2024
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