VRF water heater slashes costs for kitchen hot water
Running costs and emissions for generating hot water in the kitchen of Mitsubishi Electric at Hatfield have fallen by 78% following the installation of the company’s PWFY water-heating system.
This water-heating system has been on trial since early September 2008 supplying all the hot water required by the 3-storey building’s busy kitchen. About 300 people work in the building, and the on-site restaurant can seat a hundred people and serves cooked meals five days a week and breakfast every morning.
The restaurant previously used an air-conditioning system for cooling and a commercial gas boiler to provide hot water.
The trials show the new air-conditioning system and the PWFY that recovers heat from it would have annual running costs of about £517 and produce 2222 kg of CO2. The previous system is estimated to have cost £2367 a year to run at today’s prices and produce 10 176 kg of CO2.
For comparison, a modern gas boiler for water heating and split system air conditioning with a COP of 3.5 was calculated to have annual running costs of about £1114 and produce 5020 kg of CO2. The PWFY reduces running costs by 54% compared to the modern equivalent and CO2 emissions by 56%.
