Beatrice Lang
The International Space Station (ISS) is a large spacecraft that requires boosters and propulsion to stay on course. The ISS requires an average of 7,000 kg of propellant each year for altitude maintenance, debris avoidance, and attitude control. The propulsion system on the ISS has been a topic of discussion, with sources mentioning the possibility of the ISS taking a step towards all-electric propulsion. The ISS has eight large solar arrays that provide electrical power from the sun, but it is unclear if this power is used for propulsion. The ISS also has systems that make breathable oxygen from recycled water through electrolysis.
| Characteristics | Values |
|---|---|
| Propulsion systems | Zvezda and Zarya (NTO-UDMH) |
| Altitude | 248 miles (400 kilometers) above the Earth's surface |
| Speed | 17,227 miles per hour (27,724 kilometers per hour) |
| Power source | Eight large solar arrays |
| Area covered by solar arrays | 27,000 square feet (2,500 square meters) |
| Power generated | 84 to 120 kilowatts |
| Propellant required | 7,000 kg per year |
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What You'll Learn
ISS altitude maintenance
The International Space Station (ISS) orbits at an altitude of between 370 and 460 km (200–250 nmi). Due to atmospheric friction, the ISS falls towards Earth continually and requires periodic rocket firings to boost its orbit. The ISS requires an average of 7,000 kg of propellant each year for altitude maintenance, debris avoidance, and attitude control. Multiple supply vehicles are required to meet this demand, such as the Progress M1 spacecraft, which carries 1,950 kg of fuel, or the European Space Agency's ATV, which carries 4,000 kg.
The ISS is a complex spacecraft that requires regular maintenance. All hands-on maintenance tasks are performed by the crew, with technical support provided by ground personnel. The ISS does not return to Earth for servicing, so the provisioning of spares and resupply opportunities is limited by transportation constraints. The experience gained from maintaining the ISS will be invaluable for future missions, as it provides insights into the supportability issues associated with long-duration human spaceflight.
The ISS has multiple propulsion systems, including the Zvezda and Zarya modules, which use NTO-UDMH propellant. The Zarya module's attitude jets and main engines have been permanently disabled, but its propellant tanks still supply the jets and engines on Zvezda. The Pirs and Poisk modules also have plumbing that allows propellant to be transferred to Zvezda and Zarya for storage.
The ISS is a collaborative effort between five partner agencies: the Canadian Space Agency, the European Space Agency, the Japan Aerospace Exploration Agency, the US National Aeronautics and Space Administration, and the State Space Corporation Roscosmos. Each partner is responsible for managing and controlling the hardware they contribute. The ISS provides a unique opportunity for these agencies to work together and pursue unified and diversified research goals.
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ISS propulsion module
The ISS Propulsion Module was intended to be an American-owned propulsion system for the International Space Station. The ISS requires an average of 7,000 kg of propellant each year for altitude maintenance, debris avoidance, and attitude control. The Propulsion Module would have provided reserve propellant for one year of ISS orbit life in case of supply interruption. It would have been attached to the Unity node of the ISS and would have held 9,808 kg of fuel.
The Propulsion Module was designed with two detachable fuel modules that could be carried up and down in a shuttle cargo bay. This design was proposed after the original design exceeded its budget and fell behind schedule. The ISS Propulsion Module was ultimately deleted from the plans, requiring the station to rely on ATV and Progress spacecraft for reboost.
The Zvezda Service Module, launched aboard a Proton rocket on July 12, 2000, provides reboost propulsion for the ISS. It also provides guidance, navigation, communication, life support, and propulsion for the entire ISS. The rocket engines in the aft end of the Service Module provide reboost propulsion and attitude control thrusters for orienting the ISS. The Service Module's propulsion system includes 2x16 130 N attitude thrusters that work with the Module's gyrodynes to provide accurate attitude control.
The Progress cargo vehicles can also refuel the Zvezda module. The two main engines on Zvezda can be used to raise the station's altitude. This was first done on April 25, 2007, and it was the first time the engines had been fired since Zvezda arrived in 2000.
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ISS power sources
The electrical system of the International Space Station (ISS) is a critical component as it allows the operation of essential life-support systems, the safe operation of the station, the operation of scientific equipment, and the improvement of crew comfort. The ISS electrical system uses solar cells to directly convert sunlight to electricity. This method of harnessing solar power is called photovoltaics. Each ISS solar array wing (SAW) consists of two retractable "blankets" of solar cells with a mast between them. Each SAW is capable of generating nearly 31 kilowatts (kW) of direct current power. When fully extended, each wing is 35 metres (115 ft) in length and 12 metres (39 ft) wide. Altogether, the eight solar array wings can generate about 240 kilowatts in direct sunlight, or about 84 to 120 kilowatts of average power.
The ISS power system uses radiators to dissipate the heat that builds up from the process of collecting sunlight, converting it to electricity, and managing and distributing this electricity. These radiators are shaded from sunlight and aligned toward deep space. The power management and distribution subsystem operates at a primary bus voltage set to Vmp, the peak power point of the solar arrays. The ISS DC/DC Converter Units (DDCUs) in Node-2 provide 120 VDC secondary power to the Japanese Experimental Module (JEM) Electric Power Distribution Units (PDUs). The JEM PDUs give 120 VDC power to the JEM Power Distribution Boxes (PDBs), and the PDBs in turn provide 120 VDC tertiary power to the JEM electric consumer equipment.
Each battery assembly, situated on the S4, P4, S6, and P6 Trusses, consists of 24 lightweight lithium-ion battery cells and associated electrical and mechanical equipment. Each battery assembly has a nameplate capacity of 110 Ah (396,000 C) and 4 kWh (14 MJ). This power is fed to the ISS via the BCDU and DCSU respectively. The batteries ensure that the station is never without power to sustain life-support systems and experiments. During the sunlight part of the orbit, the batteries are recharged. The nickel-hydrogen batteries and the battery charge/discharge units were manufactured by Space Systems/Loral (SS/L), under contract to Boeing. The ISS Li-ion batteries have been designed for 60,000 cycles and ten years of lifetime, much longer than the original Ni-H2 batteries' design life span of 6.5 years.
To augment the oldest wings, NASA launched three pairs of large-scale versions of the ISS Roll Out Solar Array (IROSA) aboard three SpaceX Dragon 2 cargo launches from early June 2021 to early June 2023.
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ISS propulsion systems
The ISS requires various propulsion systems to maintain its orbit, avoid debris, and control its attitude. While I cannot confirm if the ISS has electric propulsion systems, I can provide details on its propulsion systems and power sources.
Propulsion Systems
The ISS utilizes multiple propulsion systems to maintain its orbit and perform necessary manoeuvres. One key system is the Zvezda and Zarya modules, which are equipped with propulsion capabilities. The Zarya module's attitude jets and main engines have been disabled, but its propellant tanks still supply fuel to the Zvezda module's jets and engines.
Additionally, the Pirs and Poisk modules have plumbing systems that allow propellant delivered by Progress spacecraft to be transferred to Zvezda and Zarya for storage. This flexibility in propellant transfer is crucial for the ISS's operations.
Power Sources
The ISS relies on solar power as its primary source of electrical energy. Eight large solar arrays, each 240 feet (73 meters) long, generate approximately 84 to 120 kilowatts of electricity. This power is used to operate onboard systems, recharge batteries, and maintain the station's functionality.
The ISS also employs lithium-ion batteries, which are crucial for energy storage and ensuring a stable power supply when solar arrays are not generating sufficient electricity. These batteries underwent a refresh in 2017, replacing the previous nickel-hydrogen batteries.
Future Propulsion Enhancements
There have been discussions and proposals for enhancing the ISS's propulsion capabilities with electric propulsion systems. In 2014, there were speculations about the potential integration of electric propulsion for altitude maintenance. However, challenges related to power integration and system scheduling were mentioned as possible obstacles.
While the VASIMR propulsion system was considered for the ISS, it was decided that it would undergo space testing before being implemented on the station. The addition of electric propulsion systems could provide improved efficiency and manoeuvrability for the ISS, but it requires careful evaluation and testing before implementation.
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ISS orbit-raising propulsion
The ISS requires an average of 7,000 kg of propellant each year for altitude maintenance, debris avoidance, and attitude control. The ISS uses hypergolic liquid propellants with a specific impulse of about 300 seconds. The Propulsion Module would have provided reserve propellant for one year of ISS orbit life in case of supply interruption. It would have been attached to the Unity node of the ISS.
There is a propulsion system on each of Zvezda and Zarya. The attitude jets and main engines on the Zarya module have been permanently disabled, but the propellant tanks are still used to supply the jets and engines on Zvezda. Pirs and Poisk have plumbing so that propellant delivered by Progress can be transferred to Zvezda and Zarya for storage.
The Tiangong space station's orbit-boosting propulsion system is more efficient and powerful than the ISS's. While it still uses regular fuel propellants, it is not a liquid or solid propellant. It is presumed to be some sort of electric thruster, possibly an ion thruster. The electricity generated from the panel wings helps keep the lights on and powers the spacecraft's propulsion technology.
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Frequently asked questions
The ISS requires various propulsion methods to stay on course, including boosters and propellant. The ISS has multiple supply vehicles that provide an average of 7,000 kg of propellant each year for altitude maintenance, debris avoidance, and attitude control. However, there is no clear evidence that the ISS uses electric propulsion systems.
The ISS requires electrical power to operate its onboard systems, just like any home. Eight large solar arrays, each 240 feet (73 meters) long, provide electrical power from the sun. These arrays generate approximately 84 to 120 kilowatts of electricity, enough to power over 40 homes.
Electric propulsion systems in space face challenges such as power availability and integration with existing systems. The ISS must balance the power demands of its various systems, and even with sufficient power, integrating electric propulsion with the rest of the system can be complex.
