Matthew R J Elliott Engineering 2 Bettys Nose Farm Forty Foot Bank Ramsey Forty Foot Huntingdon Cambs PE26 2XR Date: 14/08/15 Job Reference: SCO2015003 TECHNICAL VALIDATION & COMPARISON REPORT CLIENT: Scotts & Co Engineer: Matthew R J Elliott BSc (Hons), MCIBSE, CertIOSH, Subscribing member of BSi Instruction The client (Scotts & Co) have instructed us to conduct tests and compare both power consumption to boil a thermal pot (2 models selected) with a standard 1.5L kettle Benchmarking of heat retention, 24/12 hour running costs and to ascertain on a technical level what savings (if any) can be made by using this product by the consumer. The word saving referring to energy consumption/cost to run in a like for like scenarios The client has provided us with the following statement by the Energy Savings Trust A typical household boils a kettle on average 4 times a day Methodology This report will select at random an off the shelf kettle that has a 1.5L boil capacity and log it s consumption on a chart We will also log the 2 models of thermal pot supplied by the client with the same volume of water The results will be compared This report will look at a number of scenarios that the client deems as likely/typical and apply these findings This report will then apply the increased capacity of the thermal pots to each scenario and calculate the energy saving/loss difference between the technologies
Equipment on Test Tesco Model JKRBP13 Wattage on rating label 2500 Capacity 1.5L Thermal Pot Neostar Model M945234 Wattage on rating label 680 Capacity 3.5L Thermal Pot Neostar Model M537598 Wattage on rating label 680 Capacity 5L Sample Size 1pce 1pce 3.5L Thermal Pot 1pce 5.0L Thermal Pot Voltage Information Test bench incoming voltage @237V Test Equipment Power Master bench mounted ammeter RS branded data logger TP Interface Assumptions for Benchmarking of electricity 0.156p/unit/kwh Tap water temp 18 C Standard 280ml mug for measurements
Scenarios Scenario 1 Mr Jones from Gloucester boils his kettle in the morning for tea and once again in the evening for a coffee after his dinner (over 12 hours apart) The first boil he fills the kettle The second boil he does not (less volume) Scenario 2 Mrs McCall from Edinburgh boils her kettle 3 times a day to warm her babies bottle and twice a day for a well earned coffee and biscuit The first bottle of the day is at 6am and the bedtime bottle at 7pm The first boil she fills the kettle, It is toped up for the second and third boils also Boil five is a full kettle but on the final boil she does not top up (less volume) Scenario 3 The sales office with 6 staff has a round of teas in the morning when they all arrive As there are 6 people in the office it empties the kettle every time they have a tea break Throughout the day the staff refill and have tea breaks at 11am, 3pm, & 5pm Each time they make tea/coffee the office drains a full kettle Scenario 4 Margot and Phil take tea in the morning with their breakfast. Phil also uses hot water for his porridge At 11am they have 4 friends visit for coffee and cakes At 3pmMargot and Phil take afternoon tea usually whilst watching Countdown Just before bed they make a hot chocolate The first boils is a full kettle The second boil is also a full kettle The third boil is a full kettle The fourth boils is not refilled (less volume) Scenario 5 Mr & Mrs Average who boil their kettle 4 times in a day refilling every time they re-boil from the tap Using all 1.5L of water in the kettle Scenario 6 Mr & Mrs Jones from Wales boil their kettle four times a day 1 st boil = full 1.5litre boil; using 2 x mugs of tea @ 7am 2 nd boil = boil remaining water for 2 x mugs of tea @ 11am 3 rd boil = full 1.5litre boil; using 1 litre for cooking @ 5pm 4 th boil = refill to 1 litre for 2 x mugs @ 9pm Scenario 7 Jim & Mavis are retired and love a cup of tea! The boil their kettle a whopping 6 times a day 1 st boil = full 1.5litre boil; using 2 x mugs of tea @ 7am 2 nd boil = boil remaining water; using 2 x mugs of tea @ 11am 3rd boil = full 1.5litre boil; using for 2 x mugs of tea @ 1pm 4th boil = boil remaining water; using 2 x mugs of tea @ 4pm 5 th boil = full 1.5litre boil for cooking veg @ 5.30pm using 1 litre of water 6 th boil = boil remaining water (500ml) @ 8pm for 2 x mugs of cocoa
Results (1.5L fill in kettle & 1.5L Thermal Pot) 18 16 Thermal Pot v in pence 14 12 10 8 6 4 2 0 Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 Scenario 7 Themapot Results (1.5L & 3.5L Thermal Pot) 16 Thermal Pot v 14 in pence 12 10 8 6 4 2 0 Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 Scenario 7 Themapot
Results (1.5L & 5L Thermal Pot) 16 Thermal Pot v 14 in pence 12 10 8 6 4 2 0 Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 Scenario 7 Themapot Statements & Conclusions Drawn The thermal pot consumed 744 watts not the 680 watts stated on both samples The thermal pot consumed less energy in more scenarios than the kettle The saving is greater when the capacity usage is matched to the size of the thermal pot The report has not taken in to account time saving (commercial premises when staff are waiting for a kettle to boil) Application: Tea break, Sterilisation, Product Warming (hose,tubes, plastics) The report is an as benched data sheet as only 1pces sample only were tested Technical Data Electricity Taffif Unit/kWh 0.156 Benchmark kw 2.5 Hourly @Unity pence 0.39 Minute 0.0065 Boil time minutes 3.5 per boil 0.02275
Rounded pence 2.5 Thermal Pot 3.5L kw 0.74 Hourly @Unity pence 0.11544 Minute 0.001924 Boil time minutes 16 per boil 0.030784 Rounded pence 3 Thermal Pot 5.0L kw 0.74 Hourly @Unity pence 0.11544 Minute 0.001924 Boil time minutes 16 per boil 0.030784 Rounded pence 3 Holding Calculation 2 watts 12hours at 0.156kWh <1p Actual 0.0037p Calc Adjustment 1 1.5L Comp Kboils Tboils Holds Kett TP Differnce in cost/day to run kettle/yr in to run TP/yearin PERCENTAGE SAVING Scenario 1 2 1 1 5 4 1 1825 1460 20 Scenario 2 5 2 1 12.5 7 5.5 4562.5 2555 44 Scenario 3 5 5 1 12.5 16-3.5 4562.5 5840-28 Scenario 4 4 2 1 10 7 3 3650 2555 30 Scenario 5 4 4 1 10 13-3 3650 4745-30 Scenario 6 4 2 1 9 7 2 3285 2555 22 Scenario 7 6 3 1 13.5 10 3.5 4927.5 3650 26 3.5L Comp Kboils Tboils Holds Kett TP Differnce in cost/day to run kettle/yr in to run TP/yearin PERCENTAGE SAVING Scenario 1 2 1 1 5 4 1 1825 1460 20 Scenario 2 5 1 1 12.5 4 8.5 4562.5 1460 68 Scenario 3 5 3 1 12.5 10 2.5 4562.5 3650 20
Scenario 4 4 2 1 10 7 3 3650 2555 30 Scenario 5 4 2 1 10 7 3 3650 2555 30 Scenario 6 4 2 1 9 7 2 3285 2555 22 Scenario 7 6 2 1 15 7 8 5475 2555 53 5L Comp Kboils Tboils Holds Kett TP Differnce in cost/day to run kettle/yr in to run TP/yearin PERCENTAGE SAVING Scenario 1 2 1 1 5 5 0 1825 1825 0 Scenario 2 5 1 1 12.5 5 7.5 4562.5 1825 60 Scenario 3 5 2 1 12.5 9 3.5 4562.5 3285 28 Scenario 4 4 1 1 10 5 5 3650 1825 50 Scenario 5 4 2 1 10 9 1 3650 3285 10 Scenario 6 4 1 1 10 5 5 3650 1825 50 Scenario 7 6 1 1 15 5 10 5475 1825 67