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Investigation of the heat pump integrated thermochemical energy storage for cabin heating of electric vehicles in cold climates.

Number: 2152

Author(s) : VARGAS-OCHOA L. A., GONZALEZ-VALLE C. U., FRONK B. M.

Summary

Cabin heating of electric vehicles can have a significant negative impact on vehicle range. Thus, the objective of this work is to analyze the potential implementation of a Thermochemical Energy Storage Module (TCESm) integrated with a heat pump for augmenting cabin heating of electric vehicles in cold climates and reducing the need for battery storage. First, the thermal properties of the most promising salt hydrate-based thermochemical materials were investigated on the basis of mass, volume, cost, and temperature lift capability. From this, the reversible strontium bromide monohydrate to strontium bromide hexahydrate hydration reaction was identified as the most promising for use in an open TCESm, where moisture in the ambient air exothermically hydrates the salt. Then, a baseline EV thermodynamic heat pump design was specified and integrated with a model for the TCESm. The TCESm model used a lumped approach that considered the reaction kinetics as a function of time and the extent of reaction. Two TCESm heat pump integrated configurations were considered. In the first, a TCESm was supplied moisture and heated incoming evaporator air, to increase the EV heat pump evaporator saturation temperature. In the second, heated cabin air leaving the condenser was further heated in a TCESm, allowing the heat pump to run at a reduced capacity. At a baseline ambient condition of -10℃ and 30% relative humidity, the first system showed a negligible improvement of heat pump COP of 1.9%. For the second case, the compressor work could be reduced between 40 and 50% at an ambient dry-bulb of -10℃ and for between 5 and 10 kg of salt.

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  • Original title: Investigation of the heat pump integrated thermochemical energy storage for cabin heating of electric vehicles in cold climates.
  • Record ID : 30032993
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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