ABSTRACT Energy is now a costly and scare commodity in everywhere. S

Dhaval H Patel

Panchal

Prof D Ketan

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Vol-2 Issue-3 2016  IJARIIE-ISSN(O)-2395-4396 
 
2504 www.ijariie.com 2770 
Energy Conservation and Energy Saving 
Techniques apply on a Small Scale Cold 
Storage through Energy Audit 
 
Dhaval H.Patel1, Prof. Ketan D.Panchal2 
 
1
P.G. Student, M. E., Energy Engineering,Government Engineering College – Valsad,Gujarat,India 
2
Associate Professor, Mechanical Engineering Department Government Engineering College - Valsad, 
Gujarat (India) 
 
 
ABSTRACT 
Energy is now a costly and scare commodity in everywhere. So it essential for each place to carried out an 
energy audit to find the energy conservation opportunities and methods to reduce energy consumption. In 
this paper Energy study was conducted in a small scale cold storage to determine the energy consumption. 
Also we measured for different storage temperatures. Suction temperature and pressure temperature of the 
compressor and working time of the compressor were determined to reach evaporator set up 
temperatures.finally observed that the actual energy consumption of a cold storage by a compressor for 
one chamber is 32 KW per hour and theoretical energy consumption is 26 KW per hour.so minimize this 
gap then savings of Rs. 23652 /- per month will be obtained which will amount to Rs. 283824 / - per year. 
 
  Keyword:- Energy Audit, Cold Storage, Refrigeration. 
 
 
1. INTRODUCTION:- 
             ENERGY Audit is defined as the verificat ion, monitoring and analysis of energy use including 
submission of technical report containing all the recommendations for improving energy efficiency with 
cost analysis and an action plan to reduce consumption [2]. Energy auditing in a integral part of energy 
conservation and energy management is also part and parallel of conservation  [1].  
             For a typical cold storage, after wages, electricity is the second largest operational cost. With the 
huge increases in electricity network and renewable energy charges (RECs) in  recent t ime. Cold  Storage is 
a special kind of room, the temperature of, which is kept very low with the help of machines and precision 
Vol-2 Issue-3 2016  IJARIIE-ISSN(O)-2395-4396 
 
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instruments. India is having a unique geographical posit ion and a wide range of soil thus producing variety 
of fruits and vegetables like apples, grapes, oranges, potatoes, chillies, ginger, etc  [1]. Marine products are 
also being produced in large quantities due to large coastal areas. the cold storage industry renders other 
advantages and benefits to both the farmers and the consumers. The farmers get opportunity of producing 
cash crops to get remunerative p rices. The consumers get the supply of perishable commodit ies with lower 
fluctuation of prices. Commercially apples, potatoes, oranges are stored on large scale in the cold storages. 
            Energy consumption of an experimental co ld storage was measured for different storage 
temperatures. Suction temperature and pressure temperature of the compressor and working time of the 
compressor were determined to reach evaporator set up temperatures. Capacity of compressor, condenser, 
and evaporator were 10460 kJ/h, 12552 kJ/h , and 10460 kJ/h, respectively. Refrigerant was R22 [3]. 
Objective of this research is to determine energy consumption of a cold storage for different storage 
temperatures. Energy consumption of the system elements such as compressor, condenser and fan of the 
evaporator were measured and evaluated. In  addition, suction and pressu re temperatures of the compressor, 
condenser output temperature and required  time to reach to the each set up temperature were determined 
and evaluated. 
 
2. MODEL ANALYSIS AND RESULT: 
2.1. Technical analysis  :- 
          I visit a cold storage at Ahmedabad, Gujarat, INDIA and collect the data which is given below:- 
 
Fig 1: Block-Diagram of Cold Storage 
 
                      
                    
        
  
   
             
  
At first I take the data of actual energy by a compressor for one chamber from reading, this is equal to = 32 
KW per hour. 
Vol-2 Issue-3 2016  IJARIIE-ISSN(O)-2395-4396 
 
2504 www.ijariie.com 2772 
 
 
 
 
Table 1: Electricity bill of Four Month 
Month Electricity Bill 
March, 2014 28562 KWh 
April, 2014 36482 KWh 
May, 2014 41263 KWh 
June, 2014 32434 KWh 
 
So, the average of this three months electricity bill   =    
                       
 
   =  34685.25KWh 
This unit is for one month and for 2 chambers only. The running time for a month is 540 Hours. Now, Total 
unit consumption for one hour and for one chamber  =  
        
     
  =  32.11 KW per hour 
In this Cold Storage, 126 pieces of Fans and 382 Lights are running. 
Unit consumed by the fan = 0.06 KW  
Unit consumed by the light = 0.016 KW  
So, the total unit consumed by this three 
= [.06+.016] = .076 KW 
So, unit consumed by a compressor is = [32.11 - .076 ] = 32.034 KW. 
 
 
 
I have done this theoretical energy calculation with Two process : 
We know that 
              = work done by a compressor  
               =    
 
   
    { 
  
  
 
 
   -1}   [4]                                                                                                   (1.1) 
Where, 
n = 1.4 
   = 2.01 kg/  
  = 201 KPa 
  =15.3 Kg/  
  =1530 KPa 
   = 
 
 
    L     where D = Bore = 160 mm                                                                                             (1.2) 
    u   = 32 KW per hour 
Vol-2 Issue-3 2016  IJARIIE-ISSN(O)-2395-4396 
 
2504 www.ijariie.com 2773 
L = Stroke = 110 mm 
   = .00221  
  
              = 1.22 joule 
Here the speed of motor for compressor is = 1440 rpm and number of cylinder is one, then  
              = 
           
  
  = 29.32 KW per hour 
Co-efficient of performance (COP) = 
 
 
   [4]                                                                                            (1.3) 
Also, COP=
   
       
                                                                                                                                  (1.4) 
Where,     = Condensing temperature difference      = Evaporating temperature difference 
Comparing equation (1.3) and (1.4) we find the value of  W, 
Here Q = 55 KW per hour [3].  
W = 22.16 KW per hour 
             = 22.16 KW per hour 
Now , the average of this two,               = 
           
 
  = 25.74 KW per hour  
So, when I take approximate value of compressor is  
 
 
2.2. Energy Gap Analysis :- 
Gap energy =     u                
Gap energy = 32 – 26 = 6 KW per hour 
If I take per month then it becomes: 
Gap energy = (6   540) = 3240 KW per hour 
If I take per year it becomes: 
Gap energy = 3240   12 = 38880 KW per hour 
 
2.3. Cost Analysis :- 
Table 2:Cost Analysis of Four Month 
Month Unit Cost 
March 28562 KWh 208502.6 
April 36482 KWh 266318.6 
May 41263 KWh 301219.9 
June 32434 KWh 236768.2 
 
              = 26 KW per hour 
Vol-2 Issue-3 2016  IJARIIE-ISSN(O)-2395-4396 
 
2504 www.ijariie.com 2774 
So, the average cost of one month  =   
                                   
 
  =   Rs. 253202.32 /- per month 
Now the excess energy for a month is equal to 3240 KWh and for a year is equal to 38880 KWh. 
So the saving money is = 3240 x 7.3 = Rs. 23652 /- in a month. 
                                      = 38880 x 7.3 = Rs. 283824 /- in a year.  
3. CONCLUSION:- 
 
            As we conducted our extreme efforts to justify our aim for this Audit, finally we concluded some results, It 
has been observed that the actual energy consumption of a cold  storage by a compressor for one chamber is 32 KW 
per hour and theoretical energy consumption is 26 KW per hour. So, a gap of 6 KW per hour is found between the 
theoretical and actual energy consumption by a compressor. If we try to minimize this gap then savings of Rs. 23652 
/- per month will be obtained which  will amount to Rs. 283824 / - per year.For saving energy in Cold storage. we 
must be Uses of latest energy saving equipments, Use Proper Insulation. To  increase the efficiency, conventional 
lights will replaced by energy efficient devices that is LED, CFL etc. If we replace two compressors for two 
chambers with a single equivalent compressor which will deliver the same amount of load, then maximum energy 
will be saved.   
 
4. REFERENCES:- 
 
[1] http://en.wikipedia.org. 
[2]  Mehulkumar J Panchal,Ved Vyas Dwivedi and Rajendra Aparnathi ―The Case study of Energy 
Conservation and Audit in Industry Sector‖ International Journal Of Engineering And Computer 
Science,Vol.3, Issue, pp 5298-5303,April,2014. 
[3] Dr. N. Mukhopadhyay, Raj Gopal Nanda, “A  Study on Energy Audit of a Cold Storage,” Int. Journal 
of Engineering Research and Applications,vol.5, pp.06-10,April 2015. 
[4] Engineering Thermodynamics, P. K. Nag. 
 
 
 
 


Energy Conservation and Energy Saving Techniques apply on a Small Scale Cold Storage through Energy Audit

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Energy Conservation and Energy Saving Techniques apply on a Small Scale Cold Storage through Energy Audit

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