Abstarct: Using the energy is increasing by growing population around the world in recently decades. Also, human interest in accessing new energy such as wind, bio, water, solar energy and etc. is reasonable but reduction the energy consumption must consider simultaneous. One of the new methods related to produce energy from existence that doesn't use them. Also, environment pollution and supply the energy in future arise as a serious critical and because of that consumptive fuel cost in Iran won't be cheap. Although saving and recovering are good solutions for resolving this problem. On the other hand, industries try to find equipment that addition to high productivity have special advantages from economic points of view. It should be note that thermal recovers by pulsating heat pipe is one of the important methods. In this investigation to study Experimental close pulsating heat pipe efficiency in heat exchanger ,Design method and construction of a prototype heat recovery exchanger for heating air by pulsating heat pipes is investigated. In this experiment used one row of the pulsating heat pipe with filling ratios 40% of ethanol and Silver nanofluids working fluid. In this situation (condition), smoke mass flow considered constant also, affection of air mass flow changes and increasing the heat of the entry smoke upon exchanger function is considered. And analyze it from the point of view of energy and exergy has been studied.. The results show that increasing the air mass flow rate increases the temperature difference between the inlet and outlet ducts to reduce the temperature difference between warm and cold air ducts. On the other hand, increasing the temperature of the inlet duct smoke also increases the temperature difference in both of ducts. Increasing the mass flow rate and inlet temperature of Smoke will increases the heat flux on both of ducts. And also increase the efficiency of the system will increase the mass flow rate but rise of the temperature does not necessarily result in increased efficiency. also use of nanofluids, resulting in improved thermal performance of the system. The maximum increases for nanofluid in 2.5 rates of mass flow and at 130 °C inlet temperature and at the rate 11% will be occurred.