Case study 2: Keeping down the Cost I am the manager of a frozen food storage de
ID: 344661 • Letter: C
Question
Case study 2: Keeping down the Cost I am the manager of a frozen food storage depot. One of my roles is to ensure the temperature in the storage area does not rise above -18'C since above that level the food would be deemed no longer safe to eat and have to be thrown away. However, my budget is to be cut and I have to find ways of managing the depot at lower cost. One option is to increase the proportion of refrigeration that takes place at night (between 23.30 and 06.30, the cost of electricity to power the refrigeration units is one third that of the day rate). At present, no attempt is made to maximise the proportion of night time refrigeration but I think I can do better by implementing a control policy, either by means of a simple time switch or by more sophisticated computer control (note, however, that the policy should be as simple as possible, consistent with achieving reasonable savings, and avoid frequent stop/start of units, which might damage them). There are three refrigeration units, each of which will operate down to temperatures of -23 C. Each is controlled by a thermostat which turn the units on (one for each unit). At present, one unit operates all the time. The thermostat for one of the other two units is currently set at just below -18°C and the other is currently set at exactly-18C. This is the maximum level to which he temperature can be allowed to rise. With only one unit on, the temperature rises. When it approaches -18°C the second unit is turned on. If the temperature continues to rise, it reaches-18C and the third unit is turned on. Refrigeration then continues until the temperature falls to -23'C, at which point the second and third units are turned off. Periodically, the order of the units is changed to prevent excessive wear to one of them The rate at which the temperature rises varies. In the coldest winter months, the temperature will rise at 1.2C an hour with all the units off, in the hottest summer months, it will rise at 1.8'C an hour. Each unit will reduce the temperature by 0.8°C an hour, and costs £120 per hour to run at the day time rate What sort of control policy do you recommend? How much will this save me? I might be able to obtain a fourth unit on the cheap and wonder if it would be worth installing. Would installing a fourth unit enable me to save significantly more on electricity costs? I could also modify the units to lower the minimum temperature at which they will operate, perhaps by 1.0, increasing the time the temperature takes to rise to- 18 C. Would this make a difference? Or I could do both, if it would helpExplanation / Answer
For this cost problem I would suggest to use SOLAR Pannel for electricity . It will redue electricity cost at very effectively.
Here actually photovoltaic module is used to build solar module. Basically it will convert sunlight energy to electricity. Solar modules are made in semiconductor. Which is very much useful and very much wounderful that used to create integrated circuit for electric device. The sun energy it will capture in sillicon crystal and it can be stored in battery. This energy we can use in refrigarator. Here this energy is DC and we can use inverter that will comvert that to AC where we can use that into refrigarator. Hence it is very low cost . In day time energy will reserve and it will work simultaniously. Solar power refrigarator is characterized by thick insulation which will keep the refrigarator temp as per requirement. Generelly solar per and vaccine is used a combination of solar pannel or lead battary to store the energy for the clude days and at night also where sun is not there but will keep the container cool. Solar pannel will connect with solar controller and it will connecct with AC/DC plug for battery storage purpose.