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	==PlusEnergy==		==PlusEnergy==
	] is a concept coined by Rolf Disch that indicates a structure's energy efficiency. A PlusEnergy building holds a positive energy balance, generating more energy than it uses. With the completion of his private residence Heliotrope in 1994, Disch had created the first PlusEnergy house in the world. The idea of a home that captures more energy than it consumes seemed a worthwhile goal. The next stage in its development was the mass adoption of the concept to residential, commercial and retail space. As the concept further developed and gained financial backing, Disch built several more projects with PlusEnergy certifications. “PlusEnergy is a fundamental environmental imperative,” Disch claims.<ref>{{cite web \|url=http://www.rolfdisch.de/ \|title=Home \|website=rolfdisch.de}}</ref>{{nonspecific\|date=February 2022}} Disch believes that passive building is not enough because passive homes still emit {{CO2}} into the atmosphere.{{Citation needed\|date=December 2022}}		] is a concept coined by Rolf Disch that indicates a structure's energy efficiency. A PlusEnergy building holds a positive energy balance, generating more energy than it uses. With the completion of his private residence Heliotrope in 1994, Disch had created the first ] house in the world. The idea of a home that captures more energy than it consumes seemed a worthwhile goal. The next stage in its development was the mass adoption of the concept to residential, commercial and retail space. As the concept further developed and gained financial backing, Disch built several more projects with ] certifications. “PlusEnergy is a fundamental environmental imperative,” Disch claims.<ref>{{cite web \|url=http://www.rolfdisch.de/ \|title=Home \|website=rolfdisch.de}}</ref>{{nonspecific\|date=February 2022}} Disch believes that passive building is not enough because passive homes still emit {{CO2}} into the atmosphere.{{Citation needed\|date=December 2022}}

	==Environment and energy needs==		==Environment and energy needs==
	The house is designed to face the sun with its triple-pane windows (U = 0.5) during the heating months of the year and turn its highly insulated back (U = 0.12) to the sun during the warmer months when heating isn't necessary. This significantly reduces heating and cooling requirements for the building throughout the year, which are provided for by a ], while hot water is provided by vacuum-tube solar panels.{{citation needed\|date=February 2022}}		The house is designed to face the sun with its triple-pane windows (U = 0.5) during the heating months of the year and turn its highly insulated back (U = 0.12) to the sun during the warmer months when heating isn't necessary. This significantly reduces heating and cooling requirements for the building throughout the year, which are provided for by a ], while hot water is provided by vacuum-tube solar panels.{{citation needed\|date=February 2022}}

	Photovoltaic solar panels with a rated power of 6.6 kW on its roof provide five to six times more energy than the building uses, making the building "energy positive" (PlusEnergy). To further improve energy generation, the panels also rotate independently of the building to follow the sun, while being able to adapt its orientation in case of strong winds.		Photovoltaic solar panels with a rated power of 6.6 kW on its roof provide five to six times more energy than the building uses, making the building "energy positive" (]). To further improve energy generation, the panels also rotate independently of the building to follow the sun, while being able to adapt its orientation in case of strong winds.

	==Water usage and natural waste management==		==Water usage and natural waste management==
	In order to limit water usage, a gray water circuit (for washing dishes and clothes) is used. ~~It also collects rainwater.~~ Wastewater is purified in a vegetated cascade pond outside the edifice.		In order to limit water usage, a gray water circuit (for washing dishes and clothes) is used.Wastewater is purified in a vegetated cascade pond outside the edifice and it also collects rainwater.

	Natural waste and excrement are dry composted in the structure as well.		Natural waste and excrement are dry composted in the structure as well.

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The Heliotrope is an environmentally friendly housing project by German architect Rolf Disch. There are three such buildings in Germany. The first experimental version was built in 1994 as the architect's home in Freiburg im Breisgau, while the other two were used as exhibition buildings for the Hansgrohe company in Offenburg and a dentist's lab in Hilpoltstein in Bavaria.

Several different energy generation modules are used in the building including a 603 sq ft (56.0 m) dual-axis solar photovoltaic tracking panel, a geothermal heat exchanger, a combined heat and power unit (CHP) and solar-thermal balcony railings to provide heat and warm water. These innovations along with the favorable insulation of the residence allows the Heliotrope to capture anywhere between four and six times its energy usage depending on the time of year. The Heliotrope is also fitted with a grey-water cleansing system and built-in natural waste composting.

At the same time that Freiburg ’s Heliotrope was built, Hansgrohe contracted Disch's architecture practice to design and build another Heliotrope to be used as a visitor’s center and showroom in Offenburg, Germany. A third one was then contracted and built in Hilpoltstein, Bavaria to be used as a technical dental laboratory. Disch's unique design accommodates different utilizations from private residences to laboratories, and nevertheless maintains the structure's positive energy balance.

Heliotrop Rotating House

Bird's eye view of the Heliotrope in Freiburg

Heliotrope-Hotel Schloss Waretenstein

Disch also designed the Sonnenschiff office complex.

PlusEnergy

PlusEnergy is a concept coined by Rolf Disch that indicates a structure's energy efficiency. A PlusEnergy building holds a positive energy balance, generating more energy than it uses. With the completion of his private residence Heliotrope in 1994, Disch had created the first PlusEnergy house in the world. The idea of a home that captures more energy than it consumes seemed a worthwhile goal. The next stage in its development was the mass adoption of the concept to residential, commercial and retail space. As the concept further developed and gained financial backing, Disch built several more projects with PlusEnergy certifications. “PlusEnergy is a fundamental environmental imperative,” Disch claims. Disch believes that passive building is not enough because passive homes still emit CO₂ into the atmosphere.

Environment and energy needs

The house is designed to face the sun with its triple-pane windows (U = 0.5) during the heating months of the year and turn its highly insulated back (U = 0.12) to the sun during the warmer months when heating isn't necessary. This significantly reduces heating and cooling requirements for the building throughout the year, which are provided for by a heat pump, while hot water is provided by vacuum-tube solar panels.

Photovoltaic solar panels with a rated power of 6.6 kW on its roof provide five to six times more energy than the building uses, making the building "energy positive" (PlusEnergy). To further improve energy generation, the panels also rotate independently of the building to follow the sun, while being able to adapt its orientation in case of strong winds.

Water usage and natural waste management

In order to limit water usage, a gray water circuit (for washing dishes and clothes) is used.Wastewater is purified in a vegetated cascade pond outside the edifice and it also collects rainwater.

Natural waste and excrement are dry composted in the structure as well.