Highly efficient Thermodynamic Cycle with Isolated System Energy Charging (ISEC)
The objective is to demonstrate an improvement in the energy efficiency of heat pumps with up to 50 % bt using a novel technology where heat pumps are operated together with an optimal usage of storages which will reduce the average temperature level in the heat pump. The payback time for the investment is expected to be less than three years.
The project aims at developing and demonstrating how a high-efficiency heating unit based on the traditional thermodynamic cycle process in a heat pump can achieve an energy saving potential up to 50 % by using a newly developed “Isolated System Energy Charging”. (ISEC) concept. By heating one tank at a time, the condensing temperature (or evaporating temperature) of the heat pump can be made vary. This means that a condensing temperature which is only slightly higher than the medium temperature of the liquid during the heating process is obtained during the heating process.
The ISEC concept consists of use of two or more tanks. On tank is heated while the other tank, which previously has been charged, is discharged. When the second tank has been discharged, the first tank is fully charged with heat, and the system switches to discharge the first tank while the second tank is being charged. Seen from the heat source and the heat sinks perspective, the introduction of the ISEC concept does not change the conditions.
Project activities range from theoretical calculation, design and construction of individual components, overall management, construction during the experimental stage and construction of actual systems during the demonstration stage.
The results show that it is a feasible technology to operate and control both the storage system and the heat pump together. Calculations, based on R717, show that it is possible to improve the performance by 25 % when heating water from 40 to 80 °C and at the same time cooling water from 30 to 25 °C. Furthermore, a 50 % increase in the performance is measured, based on R134a and without sub-cooling, in cases where water is heated from 15 to 60 °C with an outlet temperature of 13 °C from the evaporator.
Key figures
Category
Dokumenter
Participants
| Partner | Subsidy | Auto financing |
|---|---|---|
| Teknologisk Institut | 1,38 mio. DKK | 2,49 mio. DKK |
| innotek | 0,35 mio. DKK | 0,26 mio. DKK |
| METRO THERM A/S | 0,22 mio. DKK | 0,34 mio. DKK |
| Svedan | 0,43 mio. DKK | 0,29 mio. DKK |
| ARLA FOODS AMBA | ||
| ALFA LAVAL COPENHAGEN A/S | 0,31 mio. DKK | 0,63 mio. DKK |
| Bjerringbro Fjernvarme | 0,07 mio. DKK | 0,05 mio. DKK |
| Danmarks Tekniske Universitet (DTU) | 0,82 mio. DKK | 0,15 mio. DKK |
