Question

The purpose of this project is to analyze the Ice Storage Systems that companies like Trane use to provide air conditioning to a building. In this particular environment, there are three modes to provide cooling to cooling coils. Please note that cooling coils require an external fan to blow over them to create the cold air that is used to air conditioning the room. There are three modes to cool these cooling coils: A) using the chiller only. B) using the ice storage tanks only. And C) using the chiller and the ice storage tanks at the same time. At night, usually, the ice is made by using the chiller because electricity is much cheaper at night than during the day. Assume that electricity is 25% cheaper at night. A chiller, a refrigerated room, and a cooling fan do not operate by themselves. Assume that the chiller is 65% efficient, the refrigerated room is 75% efficient and the fan is 85% efficient.

Answer 1

Warm vitality stockpiling includes adding heat vitality to a capacity medium, and afterward expelling it from that mode for use at some othertime. This may include putting away warm vitality at high tempratures or at low temperatures.

A few ice stockpiling advancements have been presented, prospered for a brief timeframe, and in this manner left the commercial center. Glycol-based ice stockpiling frameworks keep on being well known in light of the fact that they are basic and are like traditional chilled-water frameworks. Any application that is appropriate for a chilled-water framework is a contender for glycol-based ice stockpiling.

This sort of ice stockpiling framework utilizes a chiller to cool a warmth move liquid, frequently a blend of water and radiator fluid , to a temperature beneath the point of solidification of water. This liquid is siphoned through at least one ice stockpiling tanks, where warmth is moved from the water inside the tank to the heattransfer liquid. This makes the water inside the tank freeze.

There are three segments of a glycol-based ice stockpiling framework that contrast from an ordinary chilled-water framework: the ice stockpiling tank, the ice-production chiller, and a warmth move liquid that remaining parts in the fluid stage at temperatures beneath the point of solidification of water.

The kind of capacity tank most-normally utilized in a glycol-based ice stockpiling framework is known as a static tank.

A static tank is a shut vessel where the ice serves just as a medium to store warm vitality. The tank contains a warmth exchanger that is utilized to freeze water during one piece of the day, and afterward dissolve the ice during another piece of the day. This warmth exchanger is regularly built of steel, polyethylene, or polypropylene tubes that are associated with a typical header. The water that outcomes from the ice dissolving doesn't leave the tank. The ice is ordinarily put away inside a similar vessel that holds the warmth exchanger.

At the point when warmth is moved from the water inside the tank to the warmth move liquid, the water freezes. The rate at which the water inside the tank freezes is known as the freeze rate. At the point when warmth is moved from the heattransfer liquid to the ice inside the tank, the ice liquefies. The rate at which the ice dissolves is known as the liquefy rate. The freeze rate and liquefy pace of a static ice stockpiling tank rely upon the surface region of the warmth exchanger, the rate at which the warmth move liquid courses through the cylinders inside the tank, and the entering liquid temperature.

In many ice stockpiling frameworks, a similar chiller that is utilized to cool the structure can likewise be utilized to make ice. The double jobs of an ice-production chiller can considerably diminish the introduced cost of the framework. Nonetheless, an ice-production chiller is in excess of a customary chiller with two distinctive leaving-liquid temperature setpoint .

Ice-production chiller works at most extreme limit while in ice-production mode and Operates until entering-liquid temperature . It keeps on working at most extreme limit until the entering-liquid temperature dips under a foreordained lower limit. This breaking point shows that the entirety of the water inside the ice stockpiling tanks has been solidified.

While working in ice-production mode, an ice-production chiller has less coolingcapacity than when it works in customary cooling mode. This loss of limit is because of the adjustment in thickness of the refrigerant fume at the various temperatures.

A few components impact this procedure: the necessary freeze rate and liquefy rate ofthe capacity tanks, the liquid stream rates, and the liquid temperatures.The ice stockpiling tanks must be chosen for a freeze rate that is sufficiently quick to make the ideal measure of ice in the time accessible for ice making.

Least freeze rate = ice stockpiling limit/time accessible for making ice .

while choosing the chillers, the ice stockpiling tanks, and the

framework stream rates and temperatures are interrelated. As portrayed in Period

Two, the ice stockpiling tank and the chiller react contrastingly to different liquid stream rates and temperatures. while choosing the chillers, the ice stockpiling tanks, and the framework stream rates and temperatures are interrelated. As portrayed , the ice stockpiling tank and the chiller react contrastingly to different liquid stream rates and temperatures.

During ice-production mode, the ice stockpiling tank is frequently the main burden being served by the ice-production chiller. In this manner, the freeze pace of the ice stockpiling tank must offset with the ice-production limit of the chiller, and the liquid stream rates through both the chiller and tank are equivalent.

Warm ice stockpiling is a demonstrated innovation that lessens chiller size and moves blower vitality, condenser fan and siphon energies, from top periods, when vitality costs are high, to non-top periods, where electric vitality is progressively copious and more affordable.

Another favorable position of ice stockpiling that you can estimate your chiller with a littler limit.

Advantages of a Chiller Plant with Ice Storage :

*) If the electric assistance is interfered with, you can keep conveying space cooling while the put away ice endures. You despite everything need a reinforcement generator for HVAC siphons and fans, however the heap on the generator is a lot of lower when you deduct the chiller!

*) You can utilize ice for space cooling at whatever point your chiller is under routine upkeep, giving solace to building inhabitants.

*) You can't run cooling frameworks with wind turbines and sun powered boards, since their vitality yield is variable. In any case, on the off chance that you have an ice stockpiling framework, surplus age from wind turbines or sun oriented exhibits can be utilized to make ice.

* ) A chiller with ice stockpiling offers you increasingly operational adaptability, while lessening your space cooling costs.