Calculations and methodology
For the annual and daily hot water costs
The figures for heating water with Logicor's InLine Hot Water System are taken from actual measurements on a real system taken using industry standard power analyser equipment (Precision Power Scope PX8000) from Yokogawa with an accuracy of 0.01%.
Our calculation method for the cost of heating bath water with an Electric Immersion Heater and Modern A-Rated Gas Heater is outlined below. |
Last calculations made 18 December 2015.
T1 = Temperature of cold water entering system in Kelvin (K) T2 = Temperature of hot bath water in Kelvin (K) V = Volume of bath water (litres) S = Specific heat capacity of water is 4.18 J/cm3/K Be = Boiler efficiency (A-Rated is assumed 90%) EJ = Energy required to heat water in Joules EB= Energy required to heat water with boiler efficiency adjustment C = Cost to heat one bath
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(EJ) Energy required to heat the water in Joules is therefore :
EJ (in Joules) = S x (T2-T1) x V x 1000 Adjustment to account for the boiler efficiency (EB in Joules) is therefore : EB (in Joules) = EJ x ((1 + (100-Be)) / 100) To convert Joules to kWh (1 kWh = 3600000 Joules) is therefore : EB (in kWh) = EB (in Joules) / 3600000 (C) The cost to heat one bath in kWh is therefore: C = EB x Energy price per kWh |
Logicor (CH) Ltd. Unit 7, Thornes Office Park, Monckton Road, Wakefield, WF2 7AN, United Kingdom
Logicor (CH) Limited is an Appointed Representative of Improveasy Ltd., a company registered in England and Wales (Co. Reg. number 7807352). Registered Office: Manchester Business Park, 3000 Aviator Way, Manchester M22 5TG. The firm is authorised and regulated by the Financial Conduct Authority (FRN 708623). The firm is authorised as a Broker, not a Lender, and offers credit facilities from a panel/one lender. The credit is subject to application and status. For our privacy policy click here. For our complaints policy click here. |