Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Waste water system


Published on

Group 4 project on

  • Be the first to comment

  • Be the first to like this

Waste water system

  1. 1. Drain-Water Heat Recovery<br />Why would you pay for heat only to let it go down the drain? <br />
  2. 2. Whether washing clothes by hand or letting the machine do the work, the water going down the drain contains a lot of heat energy.<br />For homeowners, this wasted heat energy costs several thousands kroner per year. <br />For a business (school), it can add up to more than tens of thousands of kroner.<br />
  3. 3. OUR PROPOSAL<br />Toimplement “Drain-waterheatrecovery” in UncleTom’sCabin, usingthehotwaterusedbythewashing machines. <br />
  4. 4. Howdoesitwork? <br />Drain water flows through a spiral tube; this warms the tank water, which rises to the top. Water heater takes preheated water by circulation through a coil at the top of the tank.<br />
  5. 5. Benefits<br />Saves up to 40% on water heating costs!*<br />Maintenance-free and has no moving parts to break down.<br />Is environmentally friendly, reducing the energy consumption by five to 10%.<br />Reduces greenhouse-gas emissions.<br />* Heat-RecoveryWaterheating<br />
  6. 6. Data<br />Aftersampling 15 out of 200 studentstheresults show thatanaverage of 1.13 washes per personeachweekare done 200*1.13=226.6 washes per week. <br />Thewashing machine takes 0.25 kWh per kilogramof clothes. Anaproximation of 5-7 kilograms are washedeach time<br /> 0.25*5=1.25 kWh 0.25*7=1.75 kWh<br />
  7. 7. For 230 washesbetween 287.5-402.5 kWh are used. <br />Thecost of each 1kWh is 0.50 kr:<br /><ul><li>287.5 kWh (0.50)=143.75 kr
  8. 8. 402.5 kWh (0.50)= 201.25 kr</li></ul>Assumingthatthe machines are used 9 monthseachyear:<br />5545kr <br />7765kr <br />
  9. 9. Accordingtoinvestigationsthissystem can save up to 40% of thecosts. <br />5545kr saving 40% =2218kr.<br />7765kr saving 40% =3106kr. <br />
  10. 10. FINANCIAL ISSUES<br />Costs<br /><ul><li>Between 2145 and 3580 kronerper system.
  11. 11. Withthesaving of 2218kr-3106kr theinvestmentwouldberecovered in oneyear. </li></li></ul><li>CONCLUSION<br />Ifthesystemisapplied:<br />Thecollegewillsavemoney (3000 kr per year, afterthefirstyear), and energywillberecycled. <br />Itwouldcontributetoourgoal of an eco-village. <br />
  12. 12. ALTERNATIVE OPTION<br />If for certain reasons the system can’t be applied in Uncle Tom’s Cabin, we recommend the College to use it in the new Leirskule building as a general system. It would be minimize the waste of energy through dissipated heat. <br />