In order for better selection and energy saving design of data center air conditioning system

energy consumption models for three types of data center air conditioning

air cooling direct expansion unit

dual cooling source chiller and combined refrigeration unit with heat pipe

were established. The annual energy efficiency ratio (AEER) and annual energy consumption of the three types of air-conditions with the same air conditioning load and return air parameters were calculated and analyzed based on the meteorological data of four cities

i.

e.

Harbin、Beijing

Shanghai and Guangzhou in DEST

. The results showed that the AEER of these three units increase along with the decrease of the average temperature from south to north. As a result

the AEER of them are 4.07-4.45、4.00-6.84 and 4.27-8.20. Comparing the combined refrigeration unit with heat pipe with air cooling direct expansion unit and dual cooling source chiller

the energy saving rate of the heat pipe is 4.8%-46% and 6.4%-16.6% respectively. In comparison with the air cooling direct expansion unit

the energy saving of dual cooling source unit are obvious

because it can use natural cooling resource to replace or partially replace the compression refrigeration. Compared with dual cooling source chiller

combined refrigeration unit with heat pipe has the advantages of low refrigerant transporting power

high heat exchange efficiency and anti-freezing. Therefore

combined refrigeration unit with heat pipe is the first choice for the data center air conditioning system in low annual temperature area.