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screems FAQs

Question 1: How do Stirling Engines work?

Every Stirling engine has a closed cylinder, with one part hot and the other cold sealed inside. There is a working fluid inside, typically as vapour gas (such as air, helium or even water as hi-pressure steam), that moves by pressure from the hot side to the cold side. When the working fluids is on the home side, it expands and pushes the piston away from its top-of-cylinder ("TOC”) position creating energy. When the working fluid is on the cold side it contracts and causes compression that draws the piston back to a TOC position, also creating energy. Properly designed Stirling engines have two power pulses per revolution, which can make the very smooth running. Additional Information

Question 2: Are Stirling engines really the most efficient engines possible?

For some power requirements, "yes", for others "no". For environmental-friendly applications, the Stirling engine is best, although not as efficient as fossil fuel powered engines. For example:

  • "Yes" for run silent non-nuclear submarines
  • "Yes" for thermal storage & power underwater
  • "Yes" for Combined Heat & Power systems
  • "Yes" for solar power generation to electricity
  • "Yes" for energy supply in out-space, and
  • "Yes" for re-charging batteries.
  • "No" for vehicle motors compared to the normal reciprocating engines.
  • "No" for aircraft engines.
  • "No" for portable generator sets.
Additional Information

Question 3: If Stirling engines are so efficient, could I have one in my car, in my boat or in my truck?

In the right powertrain "yes" you could, if the automotive industry built them, but they don't. This is because the right powertrain for a Stirling engine to work best in, is electrical and not mechanical, as 99% of the vehicle fleet is in the world today. It might come about in the not to distant future, we'll have to wait and see.

Question 4: How can I get a 5 to 25 kW MAPS Stirling device for my house, car, boat, etc. that will run on any fuel from cow chips to sunshine and be price competitive with a classic generator of the same capacity?

There are a number of answers to this question that must be treated separately, to gain the common ground, these are:

  • … 5 to 25 kW MAPS Stirling device for the house: Less than 1% of the households in the world, for private family dwelling, need anything like 5kW, let alone 25kW. In square meters ("M2") of living area, the average kW requirements for electrical energy today, are:
    • ½ kW for 120 m2
    • ¾ kW for 150 m2
    • 1 kW for 200 m2
    • 2 kW for 300 – 400 m2
    • 3 kW for 400 – 600 m2
    • 5 kW for 1,000+ m2
    • 25kW for 10,000+ m2.
  • … car, boat etc: MAPS Stirling devices are not designed for the purpose of providing raw power to the drive shaft and differential of a car or boat, but:
    • Stirling engines have been effectively used in sailing yachts for auxiliary power (electrics, water purification etc.), and alternative boat power when the weather doesn't provide for sailing conditions.
    • See Stirling Approach
  • … that will run on any fuel from cow chips …: Not recommended, environmentally unfriendly in the logistics and processing to burnt fuel, plus adds latent smell and CO2 emissions to the world's existing pollution. Uneconomical to provide on a large scale.
  • … that will run on any fuel from … to sunshine: MAPS already incorporates Photovoltaics ("PV") as an optional renewable source of fuel to the MAPS Device.
  • … and be price competitive with a classic generator of the same capacity: Screems Energy BV are already there with MAPS Devices. There is no electrical generation system in the world that can come anywhere near to 8¢ per kWh for electricity, the total end customer unit price from screems energy, and it this we have true passive disruptive innovation. This compares to an average of:

Question 5: What are Stirling engines being used for today?

There are many applications. For example:

  • Run silent non-nuclear submarines
  • Thermal storage & power underwater
  • Combined Heat & Power systems
  • Cryogenic hospital systems
  • Solar power generation to electricity
  • Energy supply in out-space, and
  • Re-charging batteries.
Additional Information

Question 6: How much electricity can be generated with this [MAPS] system within a year?

There are multiple answers and no limits to what MAPS can provide as MAPS is manufactured in a scalable range, however, as a general rule, designed to meet any demand for all energy requirements a customer has, for example:

  • 1kW power MAPS CHP (Combined Heat & Power) provides:
    • All the hot water for consumption and space heating, and
    • 24 kWh a day of electrical energy, 8,760 kWh a year.
  • 3kW power MAPS ELS (Electro-Lastic Suspension) provides ("ELS" = electricity only, no heat) 72kWh a day, 26,280 kWh a year.
MAPS Devices can be implemented and installed in every households and SME in the world, providing CHP and/or qb technology, delivering any range from 1kW to more than 1 MW, in single unit central, or distributed multiple configurations.

Question 7: How much money can be saved for a usual house within a year?

For an average household of 180m2 living area that consumes 24kWh of electricity today, they will save as a mean average:

  • In the EU 12.5¢ per kWh, that is a saving in a year of 1,056.00€.
  • In the USA 5¢ per kWh, that is a saving in a year of $438.00.

Question 8: How can I get a MAPS system for my small business/ shop/ factory?

Send your details and contact information to and you'll receive a response that will lead to a specific proposal related to your needs to consider.

Question 9: Does this MAPS system work without solar cells and related equipment?

"Yes", MAPS CHP requires plumbed in water supply to generate hot water.
MAPS ELS doesn't require any alternative energy fuel. It is fuel-less, not needing fossil fuels, bio-fuels, or any external fuel source. It reciprocates on its own regeneration of elastic suspension energy. It is the proprietary elastic stored tension that delivers the necessary energy to the Stirling dynamics.

Question 10: Does this system work fuelled to pellets or biofuel energy systems and other alternative energy sources?

"Yes" and "no":

  • "Yes" MAPS Devices can be fuelled by green gas, and are, and power2gas generation, plus solar capture and even with funneled wind generation.
  • "No", although MAPS Devices can be fuelled with pellets et al., burning pellets is still creating CO2 and as our mantra is to be 100% ZERO CO2 emissions, we wont provide MAPS for any fuel source that adds to the world's pollution worries.

For more information about the project, or a complete and heavy overview about it, please read these papers available for download

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