In the field of HVAC engineering, electricity has been utilized to energize the air-conditioning and refrigeration systems since the last decades. Normally one-third to half of the annual total electricity consumption is used for air-conditioning and refrigeration in the metropolis worldwide as reported. The most commercially developed solar cooling technology is the absorption system. In an absorption cycle, a refrigerant and an absorbent are a pair of substances that work together. NH3-H20 and LiBr-H20 are the most common working pairs in refrigeration and air conditioning absorption refrigeration system. Although the NH3-H20 cycle is an older technology, it still remains essentially applied to large scale process plants, and LiBr-H20 absorption cycle concentrates most of the current research.