Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Solar Refrigeration


Published on

Published in: Education, Business, Technology
  • EcoSolarCool refrigerators and freezers are powered by solar energy and designed with advanced technology,
    combing the latest innovative compressors and computerized digital
    control systems. They offer huge savings on consumers' energy bills and are an excellent alternative especially compared to existing propane powered products. Our solar refrigerators range from 4.1 cu ft to 6.2 cu ft and our freezers from 3.5 cu ft to 8.8 cu ft. Learn more by visiting
    Are you sure you want to  Yes  No
    Your message goes here
  • nice
    Are you sure you want to  Yes  No
    Your message goes here

Solar Refrigeration

  1. 1. Solar refrigeration including the most latest technology
  2. 2. The principle of working an ordinary solar ice maker <ul><li>Solar Icemaker operates in two modes ,first mode works in the day and second one in the night. </li></ul><ul><li>During the day, solar energy is used to generate liquid ammonia refrigerant. </li></ul><ul><li>During the night, the generator is cooled and ice is formed in the evaporator compartment as ammonia is reabsorbed to the generator. </li></ul>
  3. 3. Operation of the Intermittent Ammonia-water System <ul><li>The operation of the intermittent aqua-ammonia system can be divided into two phases. </li></ul><ul><li>The regeneration phase </li></ul><ul><li>During the regeneration phase heat is supplied to the generator-absorber which contains an ammonia solution of high concentration, As the solution is heated the pressure rises and once condensation pressure is reached ammonia distills off and condenses in the evaporator-condenser which is immersed in a bucket of water, Fig. 2.1 </li></ul><ul><li>The refrigeration phase </li></ul><ul><li>During the refrigeration phase the heat source is removed and the generator-absorber is allowed to cool. The pressure drops and the ammonia starts evaporating drawing heat from the surroundings thus producing cooling. The weak ammonia solution in the generator-absorber absorbs the evaporated ammonia and the process continues until all the ammonia in the condenser is evaporated, Fig. 2,2, </li></ul>
  4. 5. Solid-adsorption ice-maker <ul><li>It consists of a solar collector, a condenser/heat-exchanger and an evaporator that is placed in a refrigerator box. </li></ul><ul><li>The inside of the collector is lined with an adsorption bed packed with activated carbon absorbed with methanol. </li></ul><ul><li>The refrigerator box is insulated and stocked with aluminum trays filled with water. The activated carbon can adsorb a large amount of methanol vapor in ambient temperature and desorbs it at a higher temperature (around 100 degrees C). </li></ul><ul><li>The schematic diagram of the solar refrigeration system is shown in Fig.1 </li></ul>
  5. 7. The procedure of working of the solid-adsorption ice-maker <ul><li>It also works in two modes i.e. the day mode and night mode. </li></ul><ul><li>Day mode </li></ul><ul><li>During the daytime, the sunshine irradiates the collector, so the collector is heated up and the methanol is desorbed from the activated carbon. In desorption, the liquid methanol adsorbed in the charcoal heats up and vaporizes. The methanol vapor condenses and is stored in the evaporator </li></ul><ul><li>Night mode </li></ul><ul><li>At night, the collector temperature decreases to the ambient temperature, and the charcoal adsorbs the methanol from the evaporator. </li></ul><ul><li>The liquid methanol in the evaporator vaporizes and adsorbs the heat from the water contained in the trays. </li></ul><ul><li>The methanol evaporates at a temperature of about –10 degrees C, so the water temperature can be as low as –5 degrees C and becomes icy. </li></ul><ul><li>The ice maker operates in an intermittent way to produce the refrigerating effect. </li></ul>
  6. 8. A hybrid solar power system <ul><li>The schematic design of a hybrid solar powered water heater and refrigerator is shown in Fig.3. The system consists of a solar collector, water tank adsorber / generator, condenser, evaporator, receiver, ice-box etc. </li></ul><ul><li>The working principle is based on the combination of a solar water heater and adsorption refrigeration. In the morning, the solar collector heats the water tank and along with the increase of water temperature, the temperature in the adsorbent bed rises. In an ideal process, the adsorbent temperature could reach a level very close to the water temperature in the tank. </li></ul>
  7. 9. <ul><li>Solar collector; 2.water tank; 3. adsorber; 4. condenser; 5. receiver; 7. </li></ul><ul><li>evaporator; 8. refrigerator </li></ul>
  8. 10. CONCLUSION <ul><li>Solar-powered refrigeration has a good advantage when compared to other applications. </li></ul><ul><li>The feasibility of producing ice using solar energy was studied and it was found that it is possible to produce about 4-5 kg of ice per day, with a collector area of 0.92 m 2 </li></ul>
  9. 11. Thanks