This is the senior project. If you choose this design, list the reason?? What ne

Question

This is the senior project. If you choose this design, list the reason?? What need to change, why?? How many turns or revolutions you need for the coil?? Why?? List any formula needed or considered?? Any better idea change welcome!! Thanks Our project is about thermal storage battery which will be installed next to the air conditioner unit which helps costumers save energy and lower the usage of electricity during the peak hours from 12:00pm to 111:00pm The casing is MI be made out of stainless steel. 0.5 in thick, it includes 4 set of piping, lx coil (transfers heat from hot refrigerant to block of ice) ,g,40. 1 in sjg 3x looping pipes (freezes water inside the unit) Sch 40. 1 in std. Coil will have no less than 3 revolutions. Inside is water which will be frozen , then, use the cold air blow to the house.

Explanation / Answer

Casing:

Material required: Stainless steel (or aluminium)with asbestoses insulation or thermal coal insulation during morning time and no insulation required during night time.( it is better to manufacture a insulation as box type for easy fitting to the system)

Formula: rate of heat transfer from the atmosphere to cold storage box is given by

Q=m*cp*(t2-t1)

Heat required to convert ice from water is Q=m*hfg

Heat exchanger:

Material required: Copper tubes (or iron tubes with black coating) for better heat transfer from the hot refrigerant to ice during the morning time.

Formula: for energy balance

Rate of refrigerant flows inside of copper tube is equal to rate of heat transfer from the ice.it is given by

Rate of heat transfer is Q=m*cpr*temperature difference

Rate of heat transfer from the ice Q=m*hfg+(m*cpi*temperature difference )

Here, cpr is the specific heat of the refrigerant)

Number tubes required: It is calculated based upon the amount cooling required inside of the room.

For example : rate of cooling required inside of room or amount of power saving during day time is 100 kJ

The number turns required is given by

Q=n*U*A*temperature difference.

Here, U is the overall heat transfer coefficient, A is the surface area of the tubes and n is the number of tubes.

Overall heat transfer coefficient can be calculated based upon the Reynolds number or energy balance equation .

Charge of Ice bear system:

Pump is required to push the refrigerant during ice charging mode ,so that refrigerant flows inside of the copper tube ,then, water that surrounds these coils freezes and turns to ice.( Condenser should be turn off). Pump is operated until its cooling energy required.

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