Grey Green Sustainable Energy Engineering
Industrial Engineer in Cape Town

GreyGreen is an engineering consultancy andsustainable energy solutions provider. Our expertise spans across various technologiesincluding: solar PV, water orwaste management, hydro power, biogas, wind turbines, solar thermal, energy efficiency and industrial process optimization. Established in 2010, innovative, we focus on providing customized, with our headoffice in Cape Town, turnkeyrenewable energy and energy efficiency solutions as well as on-goingmaintenance and support.

Established in 2010, Grey Green is based in Cape Town and operates throughout Southern Africa. Our reason for existing is to harness our skills and experience to develop projects with strong value propositions for our clients that utilize sustainable energy- -in order to conserve our natural resources and preserve the environment while promoting socio-economic development. Our team of energy experts comprises mechanical, civil, electrical and computer engineers. We are an also ESKOM accredited Energy Services Company (ESCO). One of Grey Green’s areas of expertise is measurement of temperatures, calculation of heat loss and heat transfer analysis to quantify the potential for energy savings. Grey Green can apply the same expertise to the design of new equipment, and for process optimisation. Grey Green recently completed a comprehensive energy audit at one of the largest tyre manufacturers in Africa. Our team investigated all energy and material flows. As expected, the renewable energy opportunities have longer payback periods than energy efficiency opportunities, but once factory efficiency has been maximised, the only way of reducing energy costs further is by producing one’s own energy from renewable sources. Grey Green has investigated the fans at numerous factories, including at several large grain mills. Often dampers are used to control flow rates and pressures. A mineral processing works has six identical, belt driven fans. None have damper control; whenever the mill is operating the fans run continuously at fixed speed. when plotted on a fan curve like the typical one in the following diagram, their combination of flow rate and pressure rise was far from the best efficiency point. Typical Fan Curve Due to the age of the fans and their motors we recommended replacement of the worst performers.