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Welcome

Welcome to Danish Exergy Technology A/S

Software and Consulting – Energy – PED – ASME – Aalborg, Denmark

Danish Exergy Technology A/S (DXT) was founded in 2001 by the CEO Keld Sørensen (M.Sc.), who has more than 25 years of experience from the boiler- and plant-industry.

DXT has specialized in software development within the following:

  • Thermal energy systems
  • Boiler- and heatexchanger designs
  • Ventilation
  • PED/EN standards
  • ASME BPVC standards

Danish Exergy Technology A/S (DXT) was founded in 2001 by the CEO Keld Sørensen (M.Sc.), who has more than 25 years of experience from the boiler- and plant-industry.

DXT has specialized in software development within the following:

  • Thermal energy systems
  • Boiler- and heatexchanger designs
  • Ventilation
  • PED/EN standards
  • ASME BPVC standards

One of our projects:

Heat driven cooling technologies in the industry

DXT has worked on a project which uses heat driven cooling technologies to exploit low temperature heat sources with temperature lower than 80°C. The project is dealing with single- and multistage absorption cooling plants with LiBr/H20 and NH3/H20 as working fluids as well as single- and two-pressurized ejector cooling plant based on water. The use of low temperature heat driven cooling plants have the advantage of relatively low outdoor temperatures in Denmark, which makes it possible to use heat sources with temperatures as low as 55°C alongside cooling of the heat source at 50°C and cold-water temperature at 5°C. Because of this, standard plants cannot be used. For heat sources with a temperature at 80°C and a cooling of the heat source of up to maximum 10°C a single-stage absorption plant is preferred. For heat sources with temperatures lower than 70°C it will be necessary to use multistage plants. In connection to cooling below the freezing point the plants based on water/ammonia will generally be preferred. Ejector cooling plants have some design and operation advantages in regard to exploiting gaseous heat sources, specifically gases with high water content, because of the pure fluids used. The ejector plants biggest weakness is that the compression relationship through the ejector is limited, which means that the plants needs to be designed with a relatively low condensing temperature which leads to a large heating surface.

One of our projects:

Heat driven cooling technologies in the industry

DXT has worked on a project which uses heat driven cooling technologies to exploit low temperature heat sources with temperature lower than 80°C. The project is dealing with single- and multistage absorption cooling plants with LiBr/H20 and NH3/H20 as working fluids as well as single- and two-pressurized ejector cooling plant based on water. The use of low temperature heat driven cooling plants have the advantage of relatively low outdoor temperatures in Denmark, which makes it possible to use heat sources with temperatures as low as 55°C alongside cooling of the heat source at 50°C and cold-water temperature at 5°C. Because of this, standard plants cannot be used. For heat sources with a temperature at 80°C and a cooling of the heat source of up to maximum 10°C a single-stage absorption plant is preferred. For heat sources with temperatures lower than 70°C it will be necessary to use multistage plants. In connection to cooling below the freezing point the plants based on water/ammonia will generally be preferred. Ejector cooling plants have some design and operation advantages in regard to exploiting gaseous heat sources, specifically gases with high water content, because of the pure fluids used. The ejector plants biggest weakness is that the compression relationship through the ejector is limited, which means that the plants needs to be designed with a relatively low condensing temperature which leads to a large heating surface.