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Combined heating and cooling systems

a technology of heating and cooling system and combined heat, which is applied in the direction of heat storage plant, lighting and heating apparatus, heating types, etc. it can solve the problems of inability to control the system, insufficient heating for re-use, and relatively inefficient system, so as to increase the “coefficient of performance” and increase the mass flow of working fluid.

Inactive Publication Date: 2017-01-12
ARRIBA COOLTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a system that uses a controllable thermal store to efficiently operate a combined heating and cooling system. By separating relatively warm and cooler portions of the heating circuit fluid, the system can simultaneously heat and cool, and achieve stable control of the overall system. The use of a stratified thermal storage tank allows for the determination of stored thermal energy from temperature sensors at different levels within the tank, facilitating control of the system based on stored energy rather than temperature per se. The system also includes a thermal dump system to efficiently control the heating circuit and increase overall system efficiency. A control system operating with a shorter cycle time controls the cooling side circuit to control the temperature of the coolant flowing into the evaporator, which increases the mass flow of working fluid through the evaporator and compressor without causing a proportionate rise in shaft power of the compressor, improving the efficiency of the refrigeration cycle.

Problems solved by technology

Using carbon dioxide as a working fluid in integrated heating and cooling systems that operate on the basis of a vapour-compression cycle has particular environmental benefits, but also poses some special problems.
Generally it has been considered that the jettisoned energy is insufficiently warm for it to be worth re-using in its entirety
However this system is not controllable and is relatively inefficient.

Method used

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  • Combined heating and cooling systems
  • Combined heating and cooling systems
  • Combined heating and cooling systems

Examples

Experimental program
Comparison scheme
Effect test

example a

Series-Mode Circuit

[0117]Referring to FIGS. 8A-8B, which corresponds to FIG. 1B, this example illustrates the effect of using an air blast heat exchanger 104 for cooling during colder weather. FIG. 8A shows temperatures in the system at t=0 minutes and FIG. 8B at t=2 minutes. FIG. 8C corresponds to a version of FIG. 7 and illustrates the main features of a lookup table for control of the (fan of) cooler 104. FIG. 8A corresponds to point a1 in FIG. 8C and FIG. 8B to point a2.

[0118]The target coolant temperature (in the mixing header) is, in this example, 21° C., a temperature suitable, for example, for an industrial process. The ambient temperature is significantly lower than this and if the temperature of the mixing header becomes excessive this can quickly be brought under control by the control of the cooler fan(s), even if the compressor is not providing much cooling effect. As previously discussed, in embodiments the scan rate of the GAM control procedure may be 90 seconds as co...

example b

Parallel-Mode Circuit

[0119]Referring to FIGS. 9A-9D, which corresponds to FIG. 1A, this example illustrates operation of the system with the cooling side in a parallel mode of operation. Thus FIGS. 9A to 9D show temperatures in the system at, respectively t=0, 6, 12, 18 minutes, and FIG. 9E illustrates the main features of a lookup table for control of the (fan of) cooler 104. In FIG. 9A the recirculation port 138 of mixing valve 116 is closed; in FIG. 9B it is partially open; in FIG. 9C it is wide open; and in FIG. 9D it is partially open once again. The SEL and SCG “gauges” are also illustrated as insets. The target coolant temperature (in the mixing header) is, in this example, 15° C., and the target suction header temperature is 10.0° C. In broad terms, the air blast heat exchanger fan(s) and valves are operated in such a way as to influence the temperature of the mixer header 110. The SCG uses the temperature of the suction header 112 as a means of determining how much or how l...

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PUM

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Abstract

We describe a combined heating and cooling system, the system comprising: a working fluid circuit comprising a compressor, a gas cooler and an evaporator; a heating circuit, thermally coupled to said working fluid circuit via said gas cooler; and a cooling circuit, thermally coupled to said working fluid circuit via said evaporator; wherein said heating circuit further comprises a thermal storage tank, in particular a stratified thermal storage tank, controllably coupled to said heating circuit to controllably store heat for said heating circuit.

Description

FIELD OF THE INVENTION[0001]This invention relates combined heating and cooling systems, in particular using carbon-dioxide as a working fluid, and to control schemes for such systems.BACKGROUND TO THE INVENTION[0002]Using carbon dioxide as a working fluid in integrated heating and cooling systems that operate on the basis of a vapour-compression cycle has particular environmental benefits, but also poses some special problems. In the vast majority of vapour-compression cooling systems the energy contained within the discharge gas of a refrigeration compressor is jettisoned as if it were a waste product. Generally it has been considered that the jettisoned energy is insufficiently warm for it to be worth re-using in its entirety[0003]A carbon-dioxide-based cooling and heating apparatus can be found in US2008 / 0245505. This describes an apparatus and method with two refrigerating cycle circuits and a sublimation heat exchanger. A heat pump using carbon-dioxide as a refrigerant and nat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28D20/00F28F27/02F25B49/02F25B9/00F25B30/02
CPCF28D20/0039F25B9/008F25B30/02F25B49/02F25B49/022F25B2400/22F25B2700/2111F25B2600/2507F25B2400/01F25B2400/24F28F27/02F25B25/005F25B27/005F25B29/003F25B2309/061F25B2339/047Y02E60/14F24D3/005F24D11/003F24D12/02F24F5/0007F28D20/0034F24F2221/18
Inventor CONNOLLY, STEVE
Owner ARRIBA COOLTECH
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