Carbon efficiency ratio metering method and low-carbon performance evaluation method for low-environment-temperature air source heat pump (cold water) unit

The invention discloses a low-environment-temperature air source heat pump (cold water) unit carbon efficiency ratio metering method and a low-carbon performance evaluation method, and the carbon efficiency ratio is equal to the carbon dioxide equivalent discharged by the low-temperature air source heat pump (cold water) unit for providing unit heat. The carbon efficiency ratio is obtained by calculating the ratio of the carbon footprint of the low-temperature air source heat pump (cold water) unit to the sum of functional units of the low-temperature air source heat pump (cold water) unit, and the carbon footprint represents the total emission amount of greenhouse gas carbon in a low-temperature air source heat pump (cold water) unit system by carbon dioxide equivalent; and the sum of function units is the sum of heat provided during the service life of the low-temperature air source heat pump (cold water) unit. According to the metering method, the total carbon emission of the product is considered, the fun