Outdoor Air-Cooling System for a Computer Room and Its Corresponding Energy-Saving Effect
Abstract
:1. Introduction
2. Application Site and System Installation
2.1. Test-Bed Model
2.2. On-Site Installation and Operation
3. Results and Discussion
3.1. Analysis of Operation Results
3.2. Energy-Saving Effect Analysis
4. Conclusions
- Efficient arrangement of the computer equipment, supply, and exhaust vents produce a uniform temperature range in the indoor space to increase the indoor setting temperature, reducing the energy consumption for cooling. In this study, although the set temperature in the computer room was increased by 2 °C, the average indoor temperature was reduced by 1.5 °C, improving the indoor environment and saving energy.
- A comparison of the power consumption of the existing computer room cooling method using only air conditioners and the proposed method shows that introducing the outdoor air cooling system yielded approximately 66% energy saving in the winter from November to February, 37% in the mid-season from March to May and from September to October, and 6% in the summer from June to August. Consequently, energy savings of approximately 40% or more per year can be achieved.
Author Contributions
Funding
Conflicts of Interest
Abbreviations
SA | Supply air volume (m3/h) |
EA | Exhaust air volume (m3/h) |
RA | Return air volume (m3/h) |
OA | Outdoor air volume (m3/h) |
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Test Bed | Servers | Facilities |
---|---|---|
Site: Koyang, Kyeonggi Floor area: 156.48 m2 Height: 2.97 m Heat transmission rate wall: 0.48 W/(m2·°C) Heat transmission rate window: 3.3 W/(m2·°C) | Number of racks: 32 (600 × 1000 × 2000) Heat release rate from servers: 40 kW (Estimated) | Air conditioner: 15 RT Dual × 2 SA Fan Air volume: 19,800 m3/h |
Before | After | |
---|---|---|
Operating set condition | 22 °C ± 2 °C DB, 50% ± 5% RH | 24 °C + 1 °C DB, 40–60% RH |
Temperature range | 26–31 °C | 21–26 °C |
Equipment | Fan Air Volume (m3/h) | Electricity Consumption (kW) |
---|---|---|
SA Fan | 9900 × 1 EA | 3.2 × 2 EA |
Compressor | - | 7.2 × 4 EA |
EA Fan, Inverter | 19,800 × 1 EA | 4.7 × 1 EA |
Conventional | Outdoor Air Introduced | |
---|---|---|
Indoor setting condition | 22 °C ± 2 °C DB, | 24 °C + 1 °C DB, |
50% ± 5% RH | 40–60% RH | |
Averaged indoor temperature (°C) | 27.6 | 26.1 |
Electric power consumption (kWh/day) | 664 | 363 |
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Hwang, J.; Lee, T. Outdoor Air-Cooling System for a Computer Room and Its Corresponding Energy-Saving Effect. Energies 2020, 13, 5719. https://doi.org/10.3390/en13215719
Hwang J, Lee T. Outdoor Air-Cooling System for a Computer Room and Its Corresponding Energy-Saving Effect. Energies. 2020; 13(21):5719. https://doi.org/10.3390/en13215719
Chicago/Turabian StyleHwang, JiHyun, and Taewon Lee. 2020. "Outdoor Air-Cooling System for a Computer Room and Its Corresponding Energy-Saving Effect" Energies 13, no. 21: 5719. https://doi.org/10.3390/en13215719
APA StyleHwang, J., & Lee, T. (2020). Outdoor Air-Cooling System for a Computer Room and Its Corresponding Energy-Saving Effect. Energies, 13(21), 5719. https://doi.org/10.3390/en13215719