Non-public expenditure and loans also are options, particularly when the engineering can exhibit a strong small business case with a clear route to profitability. Thermal wheel or rotary heat exchanger: includes a round honeycomb matrix of heat absorbing materials, which is slowly but surely rotated in the supply and exhaust https://purethermal.co.uk/media-news/november-launch-waste-heat-recycling-design-support-service-from-pure-thermal-and-oilon/