Cooling operation characteristics of multi-A/C(air conditioner)s were experimentally investigated for combination of indoor units (A+B, A+C, B+C) and operating conditions (standard, overload, low temperature and low temperature freezing). The operating data and performance of the air conditioner were measured using a multi-calorimeter. We also observed compressor frequency and pressure variations. From the experimental results, it was found that the cooling performance and the operating characteristics depend on operation combination of indoor units, in the case of 2 room simultaneous operation. In the four types of cooling tests, the cooling capacity and COP of the 3 room simultaneous operation and 2 room simultaneous operation were similar. Through this experimental study, data on the simultaneous operation characteristics of 2 room simultaneous operation according to the changes of indoor and outdoor temperature of four kinds were obtained.

ABSTRACT
 1. 서론
 2. 실험장치 및 방법
  2.1 실험장치
  2.2 실험방법
 3. 실험 결과
  3.1 2실 동시운전 시 능력 비교
  3.2 2실 동시운전 시 COP 비교
  3.3 2실 동시운전 시 압력 및 주파수 비교
 4. 결론
 References

• 양동학(Dep. of Mech. Eng., Sunmoon University) | Dong-Hak Yang Corresponding Author
• 권영철(Dep. of Mech. Eng., Sunmoon University) | Young-Chul Kwon