This report is written by Mads Nørgaard, Aarhus School of Marine and Technical Engineering 2013. Title of the project is: A future refrigeration system at Horsens Hospital. This project is about how Horsens Hospital in the future can solve a cooling capacity problem. Horsens Hospital is expected to get a cooling capacity problem due to the expansion with more buildings in the future years. This expansion is taking place as a part of transforming it to an acute hospital.
This project answers how a future refrigeration system can be built to generate cooling on an energy saving and reliable way. As a part of this refrigeration system the potential from using a heat pump will be discussed. Using a heat pump is meant to create cooling, while using the waste heat in the water heating system and thereby use less fossil fuel to create heating. To investigate whether it will be possible to use a heat pump, as a part of future refrigeration system, expert advices and articles about the subject will be used. Parts of the existing systems will be introduced in this report, so everyone with knowledge about the subject, can follow the mindset and get an outcome by reading this report. When describing the existing system, advices will also be mentioned.
To support the theories follows two proposed refrigeration solutions. The solutions will be compared with the existing systems, and the energy savings potential and payback times will be calculated.
The report also deals with topics such as what a good refrigerant could be, for the future refrigeration solution, and which taxes and regulations this involves. In these years we see a partial phasing of synthetic refrigerant. These synthetic refrigerants cause an environmental impact and are taxed in Denmark. The government is only interested in using natural refrigerants in Denmark in the future. A natural refrigerant is not taxed and will not lead to environmental impact. One of the natural refrigerants, known as natural hydrocarbons, is used in both of the proposed refrigeration solutions. HC refrigerant is a flammable and explosive gas. The report deals with all the safety precautions which must be observed, when using these refrigerants. Safety precautions as: ATEX certified electrical materials, gas detection and ventilations etc.
Rules and regulations regarding the use of these gasses come from the Danish Labor Inspections. The most important rules will be mentioned, the rest of the rules will follow as an appendix to make the future job easier. The report also deals with rules from the Danish Environmental Protection Agency regarding sound levels and how a future refrigerant solution can comply with the acceptable sound levels