Your Air-Conditioner Might Be Leaking, Be Careful!

Figure 1: Refrigerant started leaking on March 21; however, the store manager kept using the refrigeration unit for a week. Eventually, the refrigeration unit broke, and the store went out of operations.
Figure 2: Greina is a two-step framework. In the first step, Greina learns the typical temperature profile of the room through sensory data. In the second step, Greina compares estimated room temperature with the actual room temperature for leakage detection.
Figure 3: Store manager frequently visits the cold-room (especially during the day) which results in high temperature during the working hours. To ensure, Greina doesn’t confuse these deviations with refrigerant leakage, Greina maintains a bucket.
Figure 4: For each room r, Greina maintains a bucket variable (b_r) to indicate the state of refrigeration unit at the end of each hour. Bucket value helps Greina in gaining confidence before notifying the users.

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