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US 12,680,478 B2Granted
Method of operating a heat cycle system, heat cycle system and method of modifying a heat cycle system
AssigneeNoditech AB
InventorsHardy Hollingworth, Karl Gustav Persson
Life of this patent
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Abstract
A method of operating a heat cycle system, wherein the heat cycle system comprises a working fluid, which is cycled through a circuit comprising a compressor, a condenser, an expander unit, and an evaporator and wherein the expander unit is configured to generate a rotating mechanical motion, comprises operating the evaporator at an evaporator working fluid evaporation capacity that is at least about 110% of the nominal evaporator working fluid evaporation capacity. There is also disclosed a heat cycle system as well as a method of modifying a heat cycle system.
Claims14
A method of operating a heat cycle system,
- wherein the heat cycle system comprises a working fluid, which is cycled through a circuit comprising a compressor (10), a condenser (11), an expander unit (130), and an evaporator (140),
- wherein the expander unit (130) is configured to generate a rotating mechanical motion,
- wherein the method comprises:
- operating the compressor (10) to receive the working fluid in a first state, with a first pressure (P1), a first temperature (T1) and a first enthalpy (H1), and to compress the working fluid to a second state with a second pressure (P2), a second temperature (T2) and a second enthalpy (H2),
- operating the condenser (11) to receive the working fluid in the second state, and to condense the working fluid to a third state with a third pressure (P3), a third temperature (T3) and a third enthalpy (H3),
- operating the expander unit (130) to receive the working fluid in the third state, and to expand the working fluid to a modified fourth state with a modified fourth pressure (P40), a modified fourth temperature (T40) and a modified fourth enthalpy (H40),
- operating the evaporator (140) to receive the working fluid in the modified fourth state, and to evaporate the working fluid to the first state,
- wherein a nominal evaporator working fluid evaporation capacity is defined as an amount of an enthalpy reduction (H2−H3) provided by the condenser less an amount of an enthalpy increase (H2−H1) provided by the compressor,
- characterized by
- operating the evaporator at an evaporator working fluid evaporation capacity that is at least 110% of the nominal evaporator working fluid evaporation capacity, and
- a pressure drop of the working fluid over the evaporator is less than about 5 bar, and
- wherein power provided to the working fluid by the evaporator is greater than a power required to essentially isobarically raise an entropy of the working fluid from an entropy level at an outlet of the condenser to an entropy level corresponding to saturation.
9 more elements
A heat cycle system, comprising:
- a working fluid, which is cycled through a circuit comprising a compressor (10), a condenser (11), an expander unit, and an evaporator (140),
- wherein the expander unit is configured to generate a rotating mechanical motion,
- wherein a nominal evaporator working fluid evaporation capacity is defined as an amount of an enthalpy reduction (H2-H3) provided by the condenser less an amount of an enthalpy increase (H2-H1) provided by the compressor,
- characterized by
- the evaporator is sized and adapted to provide an evaporator working fluid evaporation capacity that is at least 110% of the nominal evaporator working fluid evaporation capacity, and
- a pressure drop of the working fluid over the evaporator is less than 5 bar, and
- wherein the evaporator is configured such that power provided to the working fluid by the evaporator is greater than a power required to essentially isobarically raise an entropy of the working fluid from an entropy level at an outlet of the condenser to an entropy level corresponding to saturation.
4 more elements
A method of modifying a heat cycle system,
- wherein the heat cycle system comprises:
- a working fluid, which is cycled through a circuit comprising a compressor (10), a condenser (11), an expansion valve (13), and a first evaporator (14),
- wherein the method comprises:
- replacing the expansion valve (13) with an expander unit that is configured to generate a rotating mechanical motion, and
- replacing the first evaporator (14) with a second evaporator (140) having greater working fluid evaporation capacity than the first evaporator (14), and
- wherein the second evaporator is configured such that power provided to the working fluid by the second evaporator is greater than a power required to essentially isobarically raise an entropy of the working fluid from an entropy level at an outlet of the condenser to an entropy level corresponding to saturation.
3 more elements
Dependencies are inferred from the claim text.