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-~~-.--...-...--~-----.-.. CHAPIER4: CO.MPARISONBET\VEENR-22AND CO2 SYSTEM 101 In a comparison between the heat pump systems and the ILH system it is seen that the CO2 heat pump system is operating closer to the ILH system having only a SoC temperature difference in the supply to the hotel than the ILH. Table 4.2 gives the summarized results for both the heat pump systems and the ILH system for the one winter day and one summer day. The table includes the total daily water consumption that was used by the occupants. The average outlet temperature is the average temperature supplied by the two heat pump systems to the storage vessel 1 and will be the supply temperature to the building. It finally gives the average heat pump COP for a full day. The daily water consumption by the reCipients are more or less the same for all three the systems in the summer and winter condition. The increase of hot water demand in the winter condition can be clearly seen. This corresponds with the water temperature profiles shown for the winter analysis above. Therefore the heat pump systems will clearly be operating more frequently at the winter conditions. i i CO2 R-22 i ILH CO2 R-22 ILH Total daily water consumption Summer Ave outlet Temp 58.0 C 58.0 C 57.8 C 59.1 C 58.8 C 58.9 C Ave COP 3.09 2.77 1 3.33 2.63 1 Table 4.2: Summer and winter summarized results for all three systems. 11173.71 11130.31 11232.1 1 18061.0 I 18300.4 I 17714.5 I Winter The outlet temperatures for all three the systems are more or less the same for both the heat pump systems and ILH system at both the summer and winter conditions. This is expected since both the heat pump systems are manufactured with either a head pressure valve or a variable speed pump determining the water flow that ensures a constant discharge temperature from the heat pumps. The ILH has a water regulating valve ensuring a constant discharge temperature. It can be expected that for the winter conditions the water mass flow will be lower than for the summer conditions. A Techno-Economical Analysis ofa CO, Heat Pump. School ofMechanical Engineering, North-West UniversityPDF Image | CO2 HEAT PUMP Analysis
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