Q. Exhaust gases (c P = 1.12 k J/kg K) flowing through a tubular heat exchanger at the rate of 1200 kg/hr are cooled from 400 degree Celsius to 120 degree Celsius. This cooling is affected by water (c P = 4.18 k J/kg K) that enters the system at 10 degree Celsius at the rate of 1500 kg/hr. If the overall heat transfer coefficient is 500 k J/m² hr degree, what heat exchanger area is required to handle the load for counter flow arrangement?

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Q. What is the value of specific heat for brick in J/kg K?

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Q. Which one is having highest value of specific heat?

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Q. What is the value of specific heat for asphalt in J/kg K?

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Q. What is the value of specific heat for Bakelite in J/kg K?

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Q. Which one is having lowest value of specific heat?

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Q. What is the value of specific heat for coal in J/kg K?

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Q. What is the value of specific heat for cotton in J/kg K?

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Q. What is the value of specific heat for sand in J/kg K?

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Q. Which one is having highest value of overall heat transfer coefficient?

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Q. What is the value of overall heat transfer coefficient for air to heavy tars and liquid?

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Q. What is the value of overall heat transfer coefficient for air to low viscosity liquid?

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Q. Which one is having lowest value of overall heat transfer coefficient?

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Q. What is the value of overall heat transfer coefficient for air condensers?

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Q. What is the value of overall heat transfer coefficient ammonia condensers?

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Q. What is the value of overall heat transfer coefficient for steam condensers?

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Q. Capacity ratio is defined as the product of

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Q. Which of the following is not associated with heat exchanger?

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Q. The engine oil at 150 degree Celsius is cooled to 80 degree Celsius in a parallel flow heat exchanger by water entering at 25 degree Celsius and leaving at 60 degree Celsius. Estimate the exchanger effectiveness

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Q. In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m² hr degree. Find the effectiveness of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg K

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