An Anaerobic Digester can take a wide range of biodegradable waste forms and convert the hydrocarbon within the waste into methane gas (biogas). The biogas can then be used to generate heat and/or electricity. The Sasie micro AD system is scalable from a (17m³) single 20′ shipping container (plus one container for ancilliaries) to almost any number of 17m³ container units.
Biomass boilers generally take wood chips or processed wood pellets as fuel. Because wood is usually a sustainable fuel and almost carbon neutral (in that the carbon released is equivalent to the carbon absorbed during growth), Government incentives are available for these products.
Energy Storage – Electrical
Renewable energy generators (e.g. Solar PV and wind turbines) generate power when wind and sunshine is available whereas electricity consumption has a different usage pattern. Electricity therefore needs to be stored and this is done using batteries.
Renewable heat generators (heatpumps and solar thermal panels) generate heat at different times and at different rates than heat consumption requires. Heat stores are therefore necessary to link consumption with generation.
The Sasie range of thermal stores are unique for several reasons:-
- they are compact (rectangular profile) and designed to fit through a standard door way.
- They are compact because they include phase-change material to increase thermal capacity without increasing size.
Energy Saving Technologies
There are many ways to save energy and many products available to help do that. Shown here is our shower water heat saver. This is a compact heat exchanger that takes the heat from the water leaving the shower basin and puts it in the cold water flow either into the shower mixer or the cold flowing into the hot water tank (as shown here).
Distributing heat around a property can be done in many ways. Achieving the required space heating is most efficient if done a lower temperatures. Underfloor heating is the best way of doing this, requiring a supply temperature of no more than 27ºC. Traditional central heating systems use a supply temperature of 80ºC. Sasie supply the worlds best underfloor heating and surface heating systems.
Heatpumps – Air sourced
Air-sourced heatpumps blow ambient temperature air across a heat exchanger chilling it. The heat that is removed from the air is passed (pumped) into a water heat exchanger increasing the temperature of the water.
Heatpumps – Ground sourced
A ground sourced heatpumps take heat from one or more ground loops or bore holes by chilling them. That heat is then transferred/pumped into a buildings heat distribution system or thermal store.
When multiple renewable energy generation technologies are employed at one site, control system requirements increase significantly. Sasie have developed their own controller capable of an almost unlimited number of connected sensors and control outputs.
Combined Heat and Power Systems are usually engine-driven electricity generators where the waste heat is recovered from the cooling system and exhaust gases and is transferred into a water circuit where it can be used for heating and hot water.
CHPs can be driven by a wide range of fuels including:- diesel, biodiesel, LPG, Natural Gas, Biogas or wood gas.
Wind turbines generate electricity from the wind as it moves across the blades. Larger wind turbines have proved to be very effective but micro wind turbines can also play a significant role and once installed, all the electricity is free.
With the right bits of equipment, we don’t need to have a dedicated water supply system to our home or place of work. Water (rain) is free and we get lots of it in this country (UK). Our roofs are very good at channelling rain into a single (or small number of) pipe(s). All we need to do then is contain it and filter it. Sterilisation equipment can be added if you want to drink it.
Solar PV panels are the most popular renewable energy generator technology. There are no moving parts and they just sit on your roof providing power from not much more than daylight. The power they provide is DC which can go directly into batteries and/or to an inverter (either grid -linked or stand-alone) to produce AC power for use by household appliances.
Solar thermal panels are the oldest kind of solar panel. The technology has not stood still though and they are very effective at what they do. They use sunlight to generate heat and the output temperature is far higher than that of a heat pump.
When a solar PV panel is in direct sunlight, the temperature of the panel rises significantly. This is bad for electricity generation because the higher the temperature the higher the electrical resistance. Sasie have devised a new solar panel that is chilled and the removed heat is supplied to the house/dwelling in the form of hot water. This increases electrical output from the panel.