Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Torben Schmidt Ommen"'
Autor:
Matteo Caramaschi, Laure Meljac, Stefano Poppi, Kasper Østergaard, Martin Kærn, Torben Schmidt Ommen, Brian Elmegaard
Publikováno v:
Caramaschi, M, Meljac, L, Poppi, S, Østergaard, K, Kærn, M, Ommen, T & Elmegaard, B 2022, Low Flammability Limit of Mixtures of Natural Refrigerants: Standards vs Theory . in Proceedings of ECOS 2022-The 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems 2022 . ECOS, 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Copenhagen, Denmark, 03/07/2022 .
Technical University of Denmark Orbit
Technical University of Denmark Orbit
Natural refrigerants are being increasingly adopted by heat pump manufacturers. Heat pumps using flammable refrigerants need to satisfy charge limit requirements from standard IEC/EN 60335-2-40 and EN 378. The allowed refrigerant amount for the speci
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::9c5981e8ad5c3520eaa953e1d0fe8dba
https://orbit.dtu.dk/en/publications/e49dbbd2-6fe0-4c47-84c8-e1c1c428c91d
https://orbit.dtu.dk/en/publications/e49dbbd2-6fe0-4c47-84c8-e1c1c428c91d
Autor:
Tingting Zhu, Jierong Liang, Yanjun Du, Martin Ryhl Kærn, Torben Schmidt Ommen, Jan Eric Thorsen, Brian Elmegaard
Publikováno v:
Zhu, T, Liang, J, Du, Y, Kærn, M R, Ommen, T, Thorsen, J E & Elmegaard, B 2022, Refrigerant Charge Effect on a Booster Heat Pump and Temperature Profile Matching Analysis: an Experimental Study . in Proceedings of ECOS 2022-The 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems 2022 . ECOS, 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Copenhagen, Denmark, 03/07/2022 .
Technical University of Denmark Orbit
Technical University of Denmark Orbit
Booster heat pumps (BHPs) enable the district heating (DH) system to operate at lower temperature levels, which may reduce the DH grid losses and increase the feasibility of implementing a lower temperature heat source. Compared with the existing hea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::50213046c66a37cf9e58b38c3a2e74ee
https://orbit.dtu.dk/en/publications/588933bf-a1bb-4ce5-b8db-e35c0a11eb1b
https://orbit.dtu.dk/en/publications/588933bf-a1bb-4ce5-b8db-e35c0a11eb1b
Publikováno v:
Zhang, J, Kærn, M R, Ommen, T, Elmegaard, B & Haglind, F 2019, ' Condensation heat transfer and pressure drop characteristics of R134a, R1234ze(E), R245fa and R1233zd(E) in a plate heat exchanger ', International Journal of Heat and Mass Transfer, vol. 128, pp. 136-149 . https://doi.org/10.1016/j.ijheatmasstransfer.2018.08.124
The fundamental understanding of the thermal–hydraulic performance of working fluids during condensation is important for the optimal design of the condenser in various thermodynamic cycles. This paper is aimed at obtaining flow condensation heat t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::467b32c7dccb4694bd61bd86aba0d0c4
https://doi.org/10.1016/j.ijheatmasstransfer.2018.08.124
https://doi.org/10.1016/j.ijheatmasstransfer.2018.08.124
Publikováno v:
Thorsen, J E, Svendsen, S, Smith, K M, Ommen, T & Skov, M 2021, ' Feasibility of a booster for DHW circulation in apartment buildings ', Energy Reports, vol. 7, pp. 311-318 . https://doi.org/10.1016/j.egyr.2021.08.141
Energy Reports, Vol 7, Iss, Pp 311-318 (2021)
Energy Reports, Vol 7, Iss, Pp 311-318 (2021)
With increasing focus on the performance of district heating systems, a concept is developed to obtain low district heating return temperatures from domestic hot water systems with a high share of circulation loss. For these systems, it is challengin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a494fe2209de08cd61392c0ce60aaa65
https://orbit.dtu.dk/en/publications/ccfb57dc-a074-4792-835c-d556989b6cfb
https://orbit.dtu.dk/en/publications/ccfb57dc-a074-4792-835c-d556989b6cfb
Publikováno v:
Hartmund Jørgensen, P, Ommen, T & Elmegaard, B 2021, ' Quantification and comparison of COP improvement approaches for large-scale ammonia heat pump systems ', International Journal of Refrigeration, vol. 129, pp. 301-316 . https://doi.org/10.1016/j.ijrefrig.2021.04.016
The number of large-scale heat pumps (HP) implemented in Danish district heating networks has increased in recent years. The installations are often custom-made solutions designed carefully to obtain a high Coefficient of Performance (COP). This stud
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::81a53c08f5cdfa9addd9cc5b0fd00ce1
https://orbit.dtu.dk/en/publications/3c1efd6b-d158-49fc-bf70-71fa4ac80bfa
https://orbit.dtu.dk/en/publications/3c1efd6b-d158-49fc-bf70-71fa4ac80bfa
Autor:
Jonas Kjær Jensen, Wiebke Brix Markussen, Torben Schmidt Ommen, Henrik Pieper, Brian Elmegaard
Publikováno v:
Pieper, H, Ommen, T, Jensen, J K, Elmegaard, B & Markussen, W B 2020, ' Comparison of COP estimation methods for large-scale heat pumps used in energy planning ', Energy, vol. 205, 117994 . https://doi.org/10.1016/j.energy.2020.117994
This paper compares estimation of the coefficient of performance (COP) of a large-scale heat pump (HP) for district heating based on four methods to the COP obtained using a detailed thermodynamic HP model. Four heat sources and varying district heat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c6dc867912acf84c8d8558e01dcde5e8
https://orbit.dtu.dk/en/publications/7001f4d2-b941-4a06-9689-26f7202cf757
https://orbit.dtu.dk/en/publications/7001f4d2-b941-4a06-9689-26f7202cf757
Publikováno v:
Meesenburg, W, Ommen, T, Thorsen, J E & Elmegaard, B 2020, ' Economic feasibility of ultra-low temperature district heating systems in newly built areas supplied by renewable energy ', Energy, vol. 191, 116496 . https://doi.org/10.1016/j.energy.2019.116496
Future district heating systems are expected to supply lower temperatures to increase system efficiency and enable exploitation of renewable heat sources. To answer whether it is beneficial to lower district heating temperatures below the level where
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b08b9541c6a00bfd39fdd85278a1711b
https://orbit.dtu.dk/en/publications/a026d923-21ff-4884-8402-ebae719076b8
https://orbit.dtu.dk/en/publications/a026d923-21ff-4884-8402-ebae719076b8
Publikováno v:
Meesenburg, W, Ommen, T, Markussen, W B & Elmegaard, B 2020, Influence of component sizing on the dynamic behaviour of fast-regulating two-stage ammonia heat pumps . in Proceedings of ECOS 2020: 33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems . 33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Osaka, Japan, 29/06/2020 .
Technical University of Denmark Orbit
Technical University of Denmark Orbit
Large-scale heat pumps allow for efficient conversion of electricity and low-grade heat into heat at higher temperatures that can be used to supply district heating networks. In systems that are characterised by high shares of renewable power, heat p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::2c2234a66606cee49b65ab235feedefb
https://orbit.dtu.dk/en/publications/348670e2-4a8a-489b-8a7c-398e2f8abdd7
https://orbit.dtu.dk/en/publications/348670e2-4a8a-489b-8a7c-398e2f8abdd7
Publikováno v:
Pieper, H, Ommen, T, Elmegaard, B, Volkovac, A & Markussen, W B 2020, ' Optimal design and dispatch of electrically driven heat pumps and chillers for a new development area ', Environmental and Climate Technologies, vol. 24, no. 3, pp. 470-482 . https://doi.org/10.2478/rtuect-2020-0117
Environmental and Climate Technologies, Vol 24, Iss 3, Pp 470-482 (2020)
Environmental and Climate Technologies, Vol 24, Iss 3, Pp 470-482 (2020)
Large-scale heat pumps (HPs) and refrigeration plants are essential technologies to decarbonise the heating and cooling sector. District heating and cooling (DHC) can be supplied with low carbon footprint, if power generated from renewable energy sou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2eae2c572ae0fb45d64e1b65d5bc8b91
https://orbit.dtu.dk/en/publications/ade4bd02-3f8c-4b7a-a158-1d998204fe33
https://orbit.dtu.dk/en/publications/ade4bd02-3f8c-4b7a-a158-1d998204fe33
Autor:
Torben Schmidt Ommen, Jan Eric Thorsen
Publikováno v:
Thorsen, J E & Ommen, T 2018, ' Field experience with ULTDH substation for multifamily building ', Energy Procedia, vol. 149, pp. 197-205 . https://doi.org/10.1016/j.egypro.2018.08.184
Ultra-low temperature district heating (ULTDH) substations may be an important enabler for integrating higher shares of renewables and waste heat in the district heating (DH) network. In the paper, we describe a concept and first experimental results
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::923419755b3710dc8ff9efd76b6fc9d1
https://doi.org/10.1016/j.egypro.2018.08.184
https://doi.org/10.1016/j.egypro.2018.08.184