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Dual temperature heat pump system

a heat pump and dual-temperature technology, applied in the field of electric heat pump systems, can solve the problems of complex algorithms, limited scope of heat generation to minimise cost over daily or longer periods, complex integration of variable load regulation and algorithms that attempt to minimise temperature differences, etc., to improve system flexibility, improve performance, and expand the range of heat demand and heat output of the system

Inactive Publication Date: 2017-07-27
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention uses a dual temperature heat pump concept and heat storage to improve system flexibility and expand the range of heat demand and output. This increases the controller's flexibility to improve system efficiency and reduce operating costs, such as by apporting heat output to periods of lower electricity cost. Overall, the invention improves performance and flexibility of the heating system.

Problems solved by technology

The potential to organise heat generation to minimise cost over daily or longer periods is thus very limited in scope.
Integration of variable load regulation together with algorithms that attempt to minimise temperature differences, or apportion heat output to periods of lower electricity cost, is complex because the marginal heat cost increases with higher heat output.
This generates conflicting interests, particularly where electricity cost is variable and unpredictable.

Method used

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Examples

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first embodiment

[0073]In exemplary embodiments of the present, FIG. 1, a system controller 2 (herein termed “the controller”) regulates a heat pump 4 which comprises a vapour-compression cycle for transferring heat from a heat source to a heat load.

[0074]In general, an aspect of the invention is a heating system for performing heating operations (and potentially also cooling operations) of a heated space. In exemplary embodiments, the heating system includes a heat pump and two heat output circuits in fluid communication with the heat pump for the flow of the refrigerant, the two heat output circuits comprising a major fluid circuit and a minor fluid circuit for performing different heating operations. The system further includes a power source having a variable cost. A controller is configured to control the heat pump and regulate flow of the major and minor fluid circuits to perform the heating operations. The controller is configured to determine a variable cost of electricity of the power sourc...

second embodiment

[0138]In a second embodiment of the invention, FIG. 2, the heat pump 4 includes a motorized electric fan 62 which is arranged to propel air through a finned-coil evaporator 60 in the manner of an “air-source heat pump”. In this embodiment the outdoor air temperature sensor is preferably mounted at the intake vent to the evaporator. The refrigeration cycle also contains a 4-way reversing valve 64 which is arranged in the configuration illustrated in EP0134015B1 (1984) and permits the source and major heat load circuits to be reversed such that heat can be extracted from the ‘load’ and rejected to the ‘source’ whilst the high temperature discharge heat of the refrigerant is still available to the minor circuit. This design of heat pump enables the major circuit to perform either heating or cooling functions, thus expanding the ability of the controller to minimise user discomfort. Furthermore, the combined operation of cooling the major circuit and heating the minor circuit yields a h...

third embodiment

[0147]In a third embodiment of the invention, FIG. 3, heat collectors, which may be plastic pipes that form a ground source heat exchange loop 72, are mounted in the ground in the manner of a “ground-source heat pump” system, and a circulating pump 18 transports heated coolant from the heat collectors to the heat pump evaporator 8. Ground source collectors provide a more stable temperature over daily and seasonal periods compared to air and solar-source collectors which assist the ability of the controller to predict the net cost of heat and devise more optimised heating plans. The disadvantages of ground source collectors are the high installation and maintenance costs compared to other heat sources and the relatively low source temperatures which are available during the summer.

[0148]The controller monitors the AC power output of a wind turbine generator 74 with a current transformer used as the electric generator power output sensor 52. The measured AC power is connected to the m...

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Abstract

A heating system includes a heat pump that provides heat to a major fluid circuit and a minor fluid circuit for performing different heating operations. The system includes a power source having a variable cost and a controller configured to regulate flow of the major and minor fluid circuits to perform the heating operations. The controller is configured to receive information regarding the variable cost of the power source and distribute flow between the major and minor fluid circuits to perform the heating operations to minimize the electricity cost. The combined enhanced demand regulation and enhanced output regulation amplifies the total heat output and power consumption while permitting greater use of a power source of varying cost (e.g. PV)—thereby minimizing overall daily operating cost.

Description

TECHNICAL FIELD[0001]This invention relates to electrical heat pump systems where the heat pump has an independently-cooled desuperheater, which permits supply of two different simultaneous outlet temperatures, and the system has a source of electricity with variable costs.BACKGROUND ART[0002]Heat pumps are known to be an efficient means of supplying heat for space heating and hot water supply applications, comparing favourably against the primary energy requirements of fossil fuel or biomass boilers. Improved efficiency is considered desirable to consumers as it can deliver lower operating costs. With respect to all HVAC (Heating, Ventilation and Air-Conditioning) systems, it is well-accepted that costs can also be lowered by reducing the amount of heat that must be added or removed from a building. However reducing heating or cooling demands can leave occupants thermally uncomfortable, so the user of an HVAC system will generally target a compromise between thermal comfort and cos...

Claims

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Application Information

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IPC IPC(8): F25B49/02F25B13/00F24D19/10F24D12/00F24D15/04
CPCF25B49/02F24D12/00F24D15/04F25B2500/05F25B13/00F25B2400/13F24D19/10F25B25/005F25B27/005F25B30/02F25B30/06F25B40/04F24D19/1072G05D23/1923F24D2200/02F24D2200/11F24D2200/123F24D2200/15F24D2220/042F24D2220/08F24D2240/26F25B2313/003F25B2313/021Y02B10/40Y02B10/70Y02P80/10F24H15/225F24H15/414F24H15/262F24H15/281F24H15/375F24H15/176F24H15/246
Inventor SLACK, RICHARDTOMLIN, MICHAELBARRETT, JACOBNONWEILER, JOHN
Owner SHARP KK
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