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14 декабря, 2021
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Solar desiccant cooling system in field test office building
Figure 3 shows the example of the solar desiccant cooling operation in summer. The collected hot air is used for the regeneration of AHU A and the excessive solar thermal energy is directly exhausted to outdoor. AHU B is operated in dehumidification cooling. Fresh air passed through the foundation pit is cooled to be the air of high relative humidity. The fresh air from the foundation pit is dehumidified by AHU B and is supplied to indoor. When AHU A is finished in regeneration process, AHU A is switched in dehumidification cooling operation and AHU B is switched in regeneration operation. Two set of the solar desiccant cooling system as shown in Figure 3 are installed in the field test office building as shown in Figure 5.
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Hum 1 |
dity ratio 1 AHU a out — —- 1— 1-4- -.-U — 1- V 1 1 1 1 ҐІ і 1 Lu—1»/ I if |
let in rec — Л*’1| 1 jl 1 |
eneration A г V і Г^ I 111 і і I |
^Hu B outlet in regeneration -U — J — -1— 1— L — 4- — 4- — 1- 1— Qutdoor |
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і 1 iv^4—1 i |
1 1 1 1 1 1 —і — + — Iі— I- i і і i |
і і 1 і ^—U |
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и —і — +- 1— L"’l 1 1 1 ‘"71 *T і і і l / l |
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Ц—і і і і—r і і і і і і і і і і і |
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AHU A outlet in dehumidification AHU B, outlet in dehumidification |
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600 700 800 900 1000 1100 12 00 1300 1400 1500 1600 1700 1800 190C |
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30 25 20 ^ 15 10 5 |
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C. The supplied air is dehumidified from the outdoor air by the humidity ratio of over 4.6g/kg. The cooling performance of this system was between 4-10 kW from 9:00 to 17:30. About the half of the system performance is occupied by the cooling effect of the foundation pit. Figure 7 shows the fresh air heat load for the EHP without a solar desiccant cooling system. The latent heat load is 68% of total fresh air heat load of 295MJ/day. The fresh air heat load of 73% is processed by the solar desiccant cooling system, because the daily performance of the solar desiccant cooling system is 214MJ/day as shown in Figure 6.
Though the field test space was cooled with both two solar desiccant cooling systems and EHP, the space cooling using EHP only was examined in a week per a month in order to evaluate the performance of the solar desiccant cooling system directly. The field test results for the solar desiccant cooling showed that the reduced daily electric power consumption of the EHP was 36% for the operation of the solar desiccant cooling system compared with the operation stop as shown in Figure 8. Two days when the weather data and the indoor thermal environment conditions were similar were selected to be the direct comparison.
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25 -40% I
20 15 10 5 0
comparison of this system performance. The average of daily cooling performance for the solar desiccant cooling system is 138.6MJ/day in August, 2007. The cooling performance is assumed by twice times in this building, because two set of the solar desiccant cooling system is installed.
3.5. Field test results in winter
The field test results for the solar space heating showed that the reduced daily electric power consumption of the EHP was 40% for the operation of the solar space heating systems compared with the operation stop as shown in Figure 10. The direct comparison was carried out as like the summer field test.