Air enters a food dehydration system at condition 1 and exits at condition 2. What is...

Air enters a food dehydration system at condition 1 and exits at condition 2. What is the change in enthalpy (kJ/kg dry air) of the air as it passes through the system: Condition 1: Tdb = 30C; Twb = 15C. Condition 2: Tdb = 100C; Twb = 40C. Select the closest answer.

Expert Solution

From Psychrometric chart

at DBT 30°C and WBT 15°C Enthalpy (h1) = 41.62 kJ/kg

at DBT 100°C and WBT 40°C Enthalpy (h2) = 161.66 kJ/kg

Change in enthalpy = h2 - h1 = 161.66 - 41.62 = 120.04 kJ/kg

Even you can calculate from Psychrometric Calculator

Link = https://www.kwangu.com/work/psychrometric.htm

or from psychrometric chart of high temprature

if you have any doubt please comment

samet mamat answered 2 years ago

Consider a compressor in which air enters at 1 bar, 27°C and exits at 3.5 bar,...

Consider a compressor in which air enters at 1 bar, 27°C and exits at 3.5 bar, 127°C. The work required is 127 kJ/kg of air flowing through the compressor. Heat transfer between the compressor and environment occurs at 27°C. Determine (a) the heat transfer, in kJ/kg (b) the entropy generation rate, in kJ/kg.K, for the compressor as a control volume (c) the entropy generation rate, in kJ/kg.K, for the compressor and the surrounding environment (d) the entropy generation rate, in...

Air enters a compressor at 20 oC and atmospheric pressure, and exits at 200 oC and...

Air enters a compressor at 20 oC and atmospheric pressure, and exits at 200 oC and 0.8 MPa. The output stream flows at a linear velocity of 2 m/s, through an exit diameter of 10 cm. What is the power input to the compressor? (Answer: 16.7 kW)

Air at 400 kPa, 980 K enters a turbine operating at steady state and exits at...

Air at 400 kPa, 980 K enters a turbine operating at steady state and exits at 100 kPa, 670 K. Heat transfer from the turbine occurs at an average outer surface temperature of 315 K at the rate of 30 kJ per kg of air flowing. Kinetic and potential energy effects are negligible. Assuming the air is modeled as an ideal gas with variations in specific heat, determine (a) the rate power is developed, in kJ per kg of air...

Air enters a counterflow heat exchanger operating at steady state at 22°C, 0.1 MPa and exits...

Air enters a counterflow heat exchanger operating at steady state at 22°C, 0.1 MPa and exits at 7°C. Refrigerant 134a enters at 0.2 MPa, a quality of 0.33, and a mass flow rate of 30 kg/h. Refrigerant exits at 0°C. There is no significant change in pressure for either stream. (a) For the Refrigerant 134a stream, determine the rate of heat transfer, in kJ/h (b) For the refrigerant stream evaluate the change in flow exergy rate, in kJ/h. (c) For...

1- Who is the inventor of air condition, and what year was the first modern air...

1- Who is the inventor of air condition, and what year was the first modern air conditioning produced? 2- Explain the the Combined Gas Law and 2nd law of thermodynamics briefly. 3- Explain the Air Conditioning Cycle in steps and use figure? 4- Describe the role of each part of the A/C system including: Compressor, Condenser ,Expansion valve and Evaporator. 5- What are the types of A/C? 6- Explain the working principle of Water Cooled Chiller and Air Cooled Chiller...

Liquid enters a valve at Tin and exits at Tout, Pout = 1 atm. Determine Tin...

Liquid enters a valve at Tin and exits at Tout, Pout = 1 atm. Determine Tin and Tout to vaporize 20% of the feed if the liquid is 1/3 benzene and 2/3 toluene.

Moist air enters an adiabatic humidifier system at 1 atm, 15 °C, with a relative humidity...

Moist air enters an adiabatic humidifier system at 1 atm, 15 °C, with a relative humidity of 20%. The volumetric flow rate of the incoming moist air is 150 m3/min. Saturated water vapor at 1 atm is injected into the flow such that the outlet temperature is 30 °C and the outlet relative humidity is 40%. The pressure is constant in the humidifier system. Determine the mass flow rate of the saturated water vapor entering the humidifier at state 3,...

Moist air enters an air-conditioning system as shown in the figure below at T1 = 28°C,...

Moist air enters an air-conditioning system as shown in the figure below at T1 = 28°C, ?1 = 85% and a volumetric flow rate of (AV)1 = 0.89 m3/s. At the exit of the dehumidifying section, the air is saturated, ?2 = 100%, and the condensate leaves this section at the same temperature as the moist air. At the exit of the heating section the moist air is at T3 = 24°C, ?3 = 50%. The system operates at steady...

1. Which featur ewill enable you to apply motion as one slide exits and another enters?...

1. Which featur ewill enable you to apply motion as one slide exits and another enters? a. advance b.transition c. timing 2. In reference to content development, which of the following points in not an active voice and is not parellel to the others? a. identify the purpose of the presentation b. brainstorm your thoughs c. your topic should be researched thoroughly 3.) Which of the following layouts is most commonly used when introuducing the topic of the presentation and...

Air at 60oC and 1 atm enters a smooth tube having a diameter of 2 cm...

Air at 60oC and 1 atm enters a smooth tube having a diameter of 2 cm and length of 10 cm. The air velocity is 40 m/s: 1- What constant heat flux must be applied at the tube surface to result in an air temperature rise of 5oC? 2- What average wall temperature would be necessary for this case? Answer: (1) qs = 11841W/m2 (2) Tw = 97oC

Question