Puzzle

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Across
  1. 4. cyrogenic refrigeration
  2. 5. use for gases
  3. 6. enthalpy is constant
  4. 9. entropy increases
  5. 11. solar refrigeration
  6. 12. VA system
  7. 13. ecofriendly refrigerant
  8. 14. based on heat
Down
  1. 1. reverse heat engine
  2. 2. use to exchange heat
  3. 3. tsaturation is greater than tactual
  4. 7. use to absorb refrigerant
  5. 8. reversible adiabatic
  6. 10. control the flow of refrigerant
  7. 15. coefficient of performance