Prize Details

Prize Criteria

The Prize Criteria for the Global Cooling Prize have been developed such that these are performance based ensuring that the prize is accessible to all technologies and fully technology agnostic. The Prize Criteria includes two primary criteria (climate impact and affordability) and additional supplementary criteria that are required to be met by all competing technologies.

All the performance metrics will be compared with the baseline unit

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Baseline Unit

Explanation
The baseline room air-conditioning unit selected is a 1.5 TR fixed-speed, mini-split type unit (no outdoor air supplied by unit) with an Energy Efficiency Ratio (EER) of 3.5 W/W and using R410A refrigerant with a global warming potential (GWP) of 2,088. The baseline unit’s electricity consumption is based on RMI’s energy model, simulating a 90 sq. meter apartment with south and east exposure, in New Delhi, India and is determined to be 2,969 kWh/year.
Rationale
The baseline unit was intended to be the most common, average efficiency room air-conditioning unit being sold in 2018. Fixed-speed air-conditioning units accounted for a majority of the residential room air-conditioner market in India in 2018. After reviewing research reports and manufacturer’s websites, we believe a fixed-speed EER 3.5 W/W, R410A mini split unit is most representative of new units being sold in 2018.
Black-Thermostat - Climate Impact

Climate Impact: Energy and Refrigerant

Must have 5X less climate impact than the baseline unit: Energy and Refrigerant Criteria

Explanation

The cooling solution must show the potential for at least 80% lower climate impact than the climate impact of the baseline unit. The climate impact is evaluated through the combination of reduction in grid electricity consumption (kWh) and reduction in global warming potential (GWP) of the refrigerant used. The 80:20 weighting will be used for electricity and refrigerant respectively, to arrive at the overall climate impact of the cooling solution. The reduction in grid electricity consumption will also be assessed through a side-by-side operation testing - a combination of lab and real-world testing.

Rationale

Residential cooling demand is expected to increase by 5X in developing countries over the next 30 years. A cooling solution that has 5X lower climate impact is needed to reverse the trend in increasing greenhouse gas (GHG) emissions due to this unprecedented growth in cooling demand. We believe 5X strikes the right balance between being a breakthrough that has not yet been done and being one that is achievable. Current best available air conditioning units are already approaching 3.5X lower climate impact than baseline. We reviewed a number of breakthrough technologies and have sketched out theoretical paths to achieving up to 5X less grid electricity use based on combining technology that already exists today. This when combined with a low GWP refrigerant could take us beyond the 5X climate impact requirement.

The weighting for electricity and refrigerant is based on RMI modeling and the report of the Technology and Economic Assessment Panel (TEAP) in 2018, which show that refrigerant emissions are ~ 20 percent of life-cycle GHG emissions for room air conditioners, and operational emissions are ~ 80 percent, taking into account developing market grid emissions intensity factors.

Evaluation and Scoring

To achieve a 5X lower climate impact, an overall reduction of 80% (electricity kWh and refrigerant GWP combined) as compared to the baseline will be required. For example, if a technology achieves a 75% reduction in electricity from the baseline and also uses a zero GWP refrigerant, it achieves a 100% reduction from the GWP baseline (R410A at a GWP of 2088). The overall percentage reduction achieved using the assigned 80:20 weighting would be 80% or 5X lower climate impact. This weighted percentage reduction from the baseline will then be converted to equivalent points. A zero percent reduction from the baseline i.e. a technology at baseline will receive zero points. A technology achieving 100% reduction from the baseline will receive 100 points. Any percentage reduction between 0% and 100% will be ratably converted to equivalent points between 0 to 100.

If a participant can demonstrate in their application that the cooling technology effectively delivers the full 5X lower climate impact through a combination of the standalone unit performance and reducing energy consumption in adjacent systems (example: reduced energy consumption for hot water generation), the Technical Review Committee may decide to consider such application as complying with the climate impact criteria. In such a case, the technical review committee will include the corresponding incremental climate impact and to the degree appropriate award additional points.

This scoring methodology will be used to evaluate the Detailed Technical Application of the participants and rank the top 10 finalists. To the extent that the total number of qualifying finalists selected, that meet or exceed the 5X lower climate impact criteria, falls short of the desired number of teams to go through to the final round, the Technical Review Committee may decide to invite designs that meet all other prize criteria for the prize (mentioned below), show high early stage potential to exceed 80% climate impact reduction in the future and currently exceed at least a 64% climate impact reduction from the baseline, to develop prototypes for testing.

Following field and lab testing of the baseline unit and proposed solution, the top 10 cooling solutions will receive an updated score following the same scoring methodology.

Example

If a technology achieves a 75% reduction in electricity from the baseline and also uses a zero GWP refrigerant, it achieves a 100% reduction from the GWP baseline (R410A at a GWP of 2088). The overall percentage reduction achieved using the assigned 80:20 weighting would be 80% or 5X lower climate impact. Therefore, this technology will receive 80 points. Similarly, if the technology is powered by solar PV mounted on it without exceeding the overall unit volumetric sizing criteria and uses zero GWP refrigerant, it achieves an overall reduction of 100% from the baseline and will receive 100 points.

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Black-Affordability

Affordability

Must demonstrate cost potential at manufacturing scale of no more than twice (2X) the baseline unit cost

Explanation

The assessed first cost of the solution at manufacturing scale must be no more than two times (2X) the baseline AC unit cost. The assessed first cost of the competing technologies will be determined by an independent panel of industrial engineers at a manufacturing scale of 100,000 units. The panel of industrial engineers will use the submitted bill of materials to arrive at the assessed cost figure. The typical margins and distribution costs will be added to this assessed cost to arrive at the final cost to the consumer excluding the Goods and Services Tax (GST).

The cost of any renewable generation source incorporated as part of the design will be considered in determining the total cost to the extent that it is required to achieve the stated 5X lower climate impact i.e. the total cost of the solution including the appropriate proportion of renewable source cost must be no more than 2X the cost of the baseline AC unit.

The baseline unit’s cost to the consumer provided below for year 2017-18 acts as a reference for the purpose of helping the participants to determine the target cost of their prototype. The baseline unit’s cost will be finalized by the technical review committee with reference to the previous full year’s average cost of a 1.5 TR fixed speed 3-star split air conditioner offered by the market player with highest share.

Rationale

Points will be awarded to the cooling technology based on assessed cost estimates. A hypothetical zero cost will receive 40 points and a five-times cost from the baseline will receive zero points. Any assessed cost figure between the zero and five times of the baseline cost will be ratably converted to equivalent points.

If a competing technology is not able to achieve the 2X cost limit at assessed scale but the participants can demonstrate in their application that the cooling technology brings reduced cost benefits in adjacent systems, the Technical Review Committee may decide to consider such applications as complying with the criteria and reflect the corresponding reduction in costs.

Evaluation and Scoring

A solution that achieves the 2X cost criteria will receive a total of 100 points. We also incorporate the hypothetical case of zero cost i.e. the proposed solution is made available to consumers free of cost. This zero cost will receive a total of 200 points. Any cost between the 2X and zero (free AC unit) will be ratably converted to equivalent points.

Example

A technology that has the assessed cost (at manufacturing scale of 100,000 units) at par with the baseline cost i.e. INR 35, 600, will receive 32 points. A solution that costs twice the baseline unit (2X) i.e. INR 71,200, will receive 24 points using the scoring method described above.

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Black-Power

Power Draw

Power consumption at full load i.e. rated cooling output, should not exceed 700 W

Explanation

The maximum power drawn by the solution from the electricity grid should not exceed 700 W while delivering the rated cooling capacity of 1.5 TR under standard conditions as well as over the span of lab and real-world test. The maximum or peak power draw will be calculated by using demand meters which sample at a very high frequency (fraction of a second) to determine maximum power drawn by the equipment in a given time period. The maximum draw, 700 W, represents a 60 percent reduction from baseline, and a 30 percent reduction from typical high performing units available in the market.

Rationale

Reducing power demand is critical in avoiding new power generation and distribution systems that would otherwise be needed to meet increased demand for cooling. Based on our analysis using the NREL's BEOPT tool, and review of currently available air-conditioning technology, we believe a 60 percent power reduction is achievable. Our research also shows that a 2X decrease in power is associated with a 3X reduction in energy consumption. Extending this relationship to about 5X level of efficiency suggests that a 60 percent reduction in power draw is achievable.

Typical high-performance units available today are at ~1000 - 1200 W max power draw. Examples include Gree’s 1.5 TR Hyper Hi -wall Inverter Heat Pump (model no GWH18QE -K6DNC8D) and Fujitsu’s 1.5 TR single zone mini-split heat pump (model no 18RLXFW1).

In addition, alternative technologies such as solar photovoltaics (PV), battery storage, and deep space radiative cooling could offer further opportunity for reducing maximum power draw.

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Black-Water

Water

Water consumption, if needed, for operation should not exceed 14 liters per day

Explanation

The onsite water consumption, if any is required for operation of the proposed solution, should not exceed 14 liters per day when averaged over a year with a maximum daily limit of 28 liters.

Rationale

The cooling technology should be water neutral; that is, the technology must not use more water than it saves through reduced energy consumption. Additionally, the new AC unit must use less than 10 percent of the water used for domestic purposes by a single household.

On average, the power sector in India consumed 2.1 cubic meters of water per megawatt-hour (2.1 liters per kilowatt-hour) of energy produced in 2014. Since the new AC unit will have 5X lower climate impact, the increased efficiency will reduce water consumption by 28 liters per day (during summer months).

To be conservative, in a high renewable-energy scenario in 2030, the power sector will consume 1.57 liters of water per kilowatt-hour of electricity produced. Using this number, the higher-efficiency AC unit will save 20 liters of water per day during summer months. A household in India consumes an average of 400 liters of water per day for domestic purposes.

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Emissions

Should have zero onsite emissions from any fossil fuel based captive power source or heat source

Explanation

The cooling solution should not combust fossil fuels onsite to generate a heating medium or electricity for operation of the unit.

Rationale

The proposed cooling solution should not use any onsite combustion technology to operate the unit. Including distributed combustion sources not only possesses potential safety concerns for residential applications, but also undermines the impact of increasing penetration of renewables in the electricity grid and the corresponding reduction in grid emissions intensity.

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Black-Materials

Refrigerant

Should use a refrigerant that has zero Ozone Depleting Potential (ODP), is of lower toxicity (Class A) and complies with IEC 60335-2-40 or ISO 5149

Explanation

The cooling solution should use a refrigerant that has a zero ODP in line with the Montreal Protocol.

The cooling solution should use a lower toxicity (Class A) refrigerant as per ISO 817:2014 standard.

The cooling solution should be capable of meeting test market regulations, or in their absence, international guidelines IEC 60335-2-40 (2018 or latest amended version) or ISO 5149:2014 pertaining to safety and environment performance of systems using flammable refrigerants.

In addition to above requirements, including the GWP of the refrigerant reflected in the Climate impact calculation, the Technical Review Committee may also take into consideration the charge quantity where materially different to that of the baseline unit.

Rationale

To mitigate the environmental impact from cooling, the refrigerant that is used should abide by the Montreal Protocol of zero ODP refrigerant. The refrigerant used should also meet the Class A toxicity criteria and comply with the test market or international safety standards to ensure it is safe use in the air conditioners for residential sector.

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Black-Scalability

Scalability

Should be usable in existing homes, rather than requiring a "designed in" engineering solution

Explanation

The total volumetric size of the cooling solution should not be more than two times the volumetric size of the baseline unit i.e. the total volumetric size should not exceed 0.42 cubic meters. The total volumetric size must include any dedicated renewable power generation resources and any external components that make up the proposed solution.

In addition, the installation of the cooling solution should not require any major infrastructure upgrades or structural modification to existing dwellings. For example, the installation of the super-efficient and climate friendly air conditioner units cannot mandate replacement of walls or major structural, electrical, or plumbing upgrades to existing multifamily apartment buildings.

Rationale

The cooling solution is expected to be installed in new construction buildings as well as in existing building stock. Since the prevalent vapor-compression technology does not require major in-apartment electrical or plumbing work, the new super-efficient and climate friendly air conditioning units should be able to scale in the same market conditions.

The cooling solution should be of a reasonable size such that it can be easily transported and installed in most buildings. In order to ensure viable solutions that are widely applicable, total volumetric size is limited to twice the size of a typical AC unit. Reference dimensions are based on the 1.5 TR, fixed speed Voltas mini split unit available in July 2018, the Voltas Split AC 183 JZJ1.

Indoor Unit: 990 x 315 x 242 mm (WxHxD) = 0.0755 m3

Outdoor Unit: 840 x 540 x 300 (WxHxD) = 0.136 m3

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Black-Materials

Materials

Use of materials with excessively high embodied carbon or rare earth materials should be minimized

Explanation

There will be no threshold requirements in relation to embodied carbon and rare earth materials, but the Technical Review Committee will, at their discretion, include life cycle impact assessment of any solution if they believe, in their judgement, that the solution includes materials with excessively high embodied carbon or rare earth materials, in their final determination of suitability for progression to award.

Rationale

The cooling solution should not result in unintended consequences in the future by use of materials that have excessively high embodied carbon or by using high quantities of rare earth materials. A life cycle impact assessment of any technology allows us to understand these consequences in greater depth. The cooling solutions should therefore focus on optimizing, and where possible minimizing the use of such materials, in developing the next generation innovative air conditioning solutions.

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Black-Operations

Operation

Should be designed to meet a 1.5 TR cooling load at standard outdoor conditions and maintain below 27°C DBT and 60% RH indoor conditions for testing period

Explanation

The solution should be able to deliver the cooling capacity of 1.5 TR under the standard test conditions of 35°C dry bulb temperature (DBT) and 24°C wet bulb temperature (WBT) as specified in IS 1391 (Part 1): 2017, IS 1391 (Part 2): 2018 and ISO 16358:1 - 2013. The IS 1391 standard, as applicable to the testing of prototype design (example: unitary or split type), will be followed accordingly.

During testing in the lab and real-world apartments, the cooling solution or prototype should be able to maintain below 27°C DBT and 60% RH indoor conditions under varying outdoor conditions for the duration of the test period. The prototypes as well as the baseline unit will be operated in a continuous operation mode for all days of the testing period to determine their energy consumption while assessing their ability to maintain the desired indoor conditions. An “unmet hours” allowance will be provided recognizing that the ramp up period and precision of operation of prototypes is likely to be less than that of the established baseline unit. Please refer to Testing Protocol page for more details on testing method.

Rationale

In order to maintain comfort and a healthy indoor environment, humidity must be controlled. Also, a temperature of 27˚C is increasingly being used internationally as the standard indoor set point for air-conditioning ratings. We recognize that the baseline unit has been developed over the years to deliver a stable performance under different operating conditions and hence unmet hours allowance is considered recognizing the performance glitches that prototypes may encounter during early stage.

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