2. With the aid of suitable sketch diagram(s), explain the working principle of air-water HVAC system and give two examples of its application.

What would operating an engine with 100% water in the cooling system cause? Select one: a. Corrosion of the metal parts in the cooling system b. Premature hose deterioration c. Engine overheating d. Loss of heat in the passenger compartment

A summer air-conditioning shown below is required to maintain a certain room at specified conditions. The layout of the system is indicated on the next page and the specifications are listed below.System specifications:Required room temperature: 23⁰C, 50% Relative humidityAtmospheric pressure: 101 kPaOutside air conditions: 30⁰C, 80% Relative humidity Sensible heat gain: 5 kWLatent heat gain: 4 kWTemperature rise across fan: 1.5⁰CTemperature of air leaving cooler: 12⁰CTemperature of air entering room: 18⁰CApparatus dew point of cooler: 7⁰C

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Q44 Name the different controls used in centrifugal compressors and explain their functions.

A domestic refrigerator sits in a kitchen, switched on, with the refrigerator door wide open. The kitchen itself is well insulated and it can be assumed no heat can escape or enter the kitchen from the outside. Which of the following is the most accurate statement. a. The temperature in the kitchen will go down very slightly. O b. The temperature in the kitchen could go up or down, depending on the Coefficient of Performance (COP) of the refrigerator. O c. The temperature in the kitchen could go up or down depending on the mechanical efficiency of the compressor. O d. The temperature in the kitchen will stay the same. O e. The temperature in the kitchen will go up very slightly.

ΙΟΝΑ: MECHANICAL (a) Explain four factors in determining the comfort level for an air conditioning room. Suggest the typical value for those factors.

Discuss the Volumetric Efficiency as performance parameters on the speed of an IC engine.

Explain with a neat diagram with all parameters, the components and working of a air conditioning system.

pr and temperature decrease while the volume increase Which of the following does not help in collecting results in the mechanical heat pump? Select one: O a. Pressure gage O b. Flowmeter O c. Wattmeter O d. Receiver