Heat Pump For Using Environmentally Compatible Coolants
AssigneeSiemens Aktiengesellschaft
InventorsBernd Gromoll, Florian Reissner
Life of this patent
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Abstract
A heat pump includes an internal heat exchanger and a regulating device designed to bring the temperature of the working fluid at the outlet of a compressor to a specifiable minimum difference above the dew point at the same pressure. This allows the use of novel coolants in heat pumps, e.g., coolants having a low dew line slope of under 1000/kJ in the temperature-entropy diagram and characterized by very good safety and environmental properties.
Claims8
A heat pump comprising:
- a compressor having an inlet and an outlet,
- a condenser,
- an internal heat exchanger,
- an expansion valve,
- an evaporator, and
- a temperature control device configured to raise a temperature of the working fluid at the inlet to the compressor to thereby raise the temperature of the working fluid at the outlet of the compressor to a predefinable minimum temperature difference above the dew point,
- wherein the temperature control device comprises a bypass line with a valve, wherein the bypass line connects a high-pressure region at the outlet of the compressor with a low-pressure region at the inlet to the compressor such that the value is controllable to deliver recirculated hot gas via the bypass line to working fluid flowing from the internal heat exchanger to the compressor to thereby superheat the working fluid.
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A method for operating a heat pump in which the temperature of a working fluid after compression is brought to a minimum temperature difference of 1 degree kelvin above the dew point, the method comprising:
- delivering the working fluid to a compressor, and
- superheating the working fluid at an inlet of a compressor by controlling a valve arranged in a bypass line that connects a high-pressure region at an outlet of a compressor to a low-pressure region at the inlet to the compressor, wherein controlling the valve controls a flow of hot gas to the working fluid via the bypass line.
Dependencies are inferred from the claim text.