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CHAPTER 4: CO:tvrPARlSONBETVVEENR-22AND CO2 SYSTEM 90 water per day. The WHSIM Statistical software is programmed to increase the water consumption with a certain factor for the winter time. It is assumed that the hotel is at maxim um capacity for the full year. Figure 4.1 is a schematic representation of a typical layout of the components as mentioned above. Both the heat pump systems are evaluated with the heat pump installed in parallel with two storage vessels in series. The ILH system is installed in the same way as the heat pumps but with the ILH in parallel with the series-connected vessels. The capacity of one storage vessel is 7900 Htres giving a total storage capacity of 15800 litres. For the system there are two thermostats determining the operation of the heat pump system and the in-line heater system. The thermostats are situated near the top of the hot vessel and the bottom of the cold vessel. It is important that both the systems are compared at the same ambient conditions and at the same demand for hot water by users. When compared under the same conditions a ciear comparison could be derived to see how the systems will operate in relation to each other. For comparison purposes the location was selected as Johannesburg and will therefore be operated at the same weather conditions over a period of one year. WHSIIVI can also show the results for a single day in summer and a single day in winter for more detailed hourly comparisons. The summer day was chosen as the 9th of December and the winter day as the 29th of July. The winter periods are considered to be from the first of June to the end of August and the summer periods are from the first of September to the end of May. The input files for the above-mentioned are shown in Appendixes B. A Techno-Economical Analysis ofa CO2 Heat Pump. School ofMecharncal Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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