System and method for extreme cold starting of a heating system
AssigneesDENSO International America, Inc., Denso Corporation
InventorYilin Tian
Life of this patent
Estimating the term…
Abstract
A method and system for preventing temperature undershoot in a refrigerant loop during extreme temperatures includes determining a sensed condition at a refrigerant loop and when the sensed condition is below a first threshold starting a flow of coolant in a coolant loop comprising a first portion of a first heat exchanger. The method further includes raising the temperature of the coolant from a heat source to form heated coolant, communicating refrigerant through a second portion of the first heat exchanger, heating the refrigerant in the refrigerant loop at the first heat exchanger from the heated coolant and starting a flow of refrigerant in the refrigerant loop by starting a compressor within the refrigerant loop.
Claims20
A method comprising:
- determining a sensed condition;
- when the sensed condition is below a first threshold, starting a flow of coolant in a coolant loop comprising a first portion of a first heat exchanger while not flowing refrigerant in a refrigerant loop;
- thereafter, raising a temperature of the coolant from a heat source to form heated coolant;
- starting a flow of refrigerant in the refrigerant loop by starting a compressor within the refrigerant loop;
- and heating refrigerant in the refrigerant loop at a second portion of the first heat exchanger from the heated coolant.
A system comprising:
- a sensed condition sensor determining a sensed condition;
- a first heat exchanger;
- a coolant loop comprising a first portion of the first heat exchanger;
- a refrigerant loop comprising a second portion of the first heat exchanger and a compressor;
- and
- a controller programmed to start a flow of coolant in the coolant loop and prevent flow of refrigerant in the refrigerant loop when the sensed condition is below a first threshold and above a second threshold to raise a temperature of the coolant from a heat source to form heated coolant, thereafter, said controller programmed to start flow of refrigerant and to heat refrigerant in a refrigerant loop at the first heat exchanger from the heated coolant.
Dependencies are inferred from the claim text.