Single-and double-effect absorption refrigerator

In an absorption refrigerator having:

• a first drum including an evaporator and an absorber;
• a high-temperature regenerator;
• a second drum including a low-temperature regenerator having a low-temperature heat source which is vaporized liquid absorbent derived from the high-temperature regenerator and a condenser;
• a low-temperature heat exchanger;
• a high-temperature heat exchanger;
• and a pump for circulating low-concentration liquid absorbent,
• a single-and double-effect absorption refrigerator comprising:
• a third drum including a preliminary low-temperature regenerator having a low-temperature heat source and a condenser;
• a piping for low-concentration liquid absorbent extending from the absorber to the preliminary low-temperature regenerator through the pump for low-concentration liquid absorbent;
• a piping for intermediate-concentration liquid absorbent having a pump for intermediate-concentration liquid absorbent and extending from the preliminary low-temperature regenerator to the high-temperature regenerator;
• a pipe for high concentration liquid absorbent extending from said low temperature regenerator to said low-temperature heat exchanger;
• and
• a pipe for liquid absorbent connecting a part of said piping for intermediate-concentration liquid absorbent provided on a drawing side of the pump for intermediate-concentration liquid absorbent to said pipe for high-concentration liquid absorbent.

In an absorption refrigerator having:

• a first drum including an evaporator and an absorber;
• a high-temperature regenerator;
• a second drum including a low-temperature regenerator and a condenser;
• a low-temperature heat exchanger;
• a high-temperature heat exchanger;
• and a pump for low-concentration liquid absorbent,
• a single-and double-effect absorption refrigerator comprising:
• a third drum including a preliminary low-temperature regenerator having a low-temperature heat source, and a condenser;
• a first pipe for liquid refrigerant extending downwards from the condenser in the second drum to the evaporator and having a U-seal provided intermediate the condenser in the second drum and the evaporator;
• and
• a second pipe for liquid refrigerant extending downwards from the condenser in said third drum to an upstream side of the U-seal of said first pipe for liquid refrigerant and having a U-seal provided intermediate the condenser in said third drum and the upstream side of the U-seal of said first pipe for liquid refrigerant.