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CHAP1ER 4: COMPARlSON BET\VEEN R-22 AND CO2 SYS1EM 98 For winter, figure 4.8 shows the top temperatures inside storage vessel 1 for all three the systems, and Figure 4.9 shows the bottom temperatures inside storage vessel 2 for all three the systems. From the bigger deviation in the temperature of the storage vessels it can be seen that the hot water demand for the winter period is higher than for the summer condition. The larger temperature drop in storage vessel 1 could be because the heat pump is most likely not operating at that period of the morning due to low ambient conditions and are therefore struggling to keep up with the demand for hot water. This could also be seen because the ILH does not have a significant temperature drop since it can operate at low ambient temperatures. The difference in the water temperatures at the bottom and top thermostats are much bigger in storage vessel 1 for the winter period compared to the summer period. This could be because the demand for hot water is not as easily met as for the summer conditions and the tanks are losing temperature easier because of the colder ambient surroundings. The in-line heater will most likely also be in operation more often than for the summer period due to the larger water consumption and heat losses in the winter. The ILH system will also have to be in operation more often because it can be seen that at certain periods the ILH system is also struggling to cope with the demand and therefore· has a slight decrease in its temperature profile. A Techno-Economical Analysis of a CO2 Heat Pump. School of Mechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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