Heat pump with intgeral solar collector

Abstract

The present invention generally relates to heat pumps that utilize at least one thermal source operating with the same working fluids. In one embodiment, the present invention relates to a hybrid solar heat pump comprised of at least one microchannel heat exchanger with integral solar absorber, at least one compression (i.e., mass flow regulator) device as the heat pump for concurrent compression to a higher pressure and mass flow regulator of the working fluid, and at least one working fluid accumulator with the entire system operating with the same working fluid. The present invention also generally relates to heat pump systems that utilize an inventory management system to provide both efficient and safe operation under a wide range of operating conditions.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. Patent Application Ser. No. 61,231,674 filed Aug. 6, 2009, having the title “Solar collector with expandable fluid mass management system” and U.S. Patent Application Ser. No. 61,231,238 filed Aug. 4, 2009, having the title “Heat Pump with Integral Solar Collector” and included as reference only without priority claims. Numerous additions have been made since the filing of the provisional patent applications cited earlier. These include FIGS. 9-14, and FIG. 17. The combining of the two provisional filings have lead to some of the original figures being renumbered to maintain like numerals for like components.FIELD OF THE INVENTION[0002]The present invention generally relates to a heat pump system having a highly integrated mass management system and external heat source to increase operating efficiency and reduce capital cost. In all embodiments, the present invention utilizes the same wo...

AI Technical Summary

Benefits of technology

[0008]The present invention is directed to the use of expandable fluids for thermally activated processes. The expandable fluid when heated has decreasing density given the same pressure, and increasing the pressure creates heat of compression. The heat of compression is realized in the art through the operation of a heat pump. The further coupling of heat the expandable fluid using either solar energy or other externally combusted fuels enables a significant reduction of capital cost thus lowering the levelized cost of energy, whether that energy be in the form of thermal or electricity / mechanical energy. The change in density further enables one power consuming device, which is a heat pump operable as a turbocompressor, turbopump, or other configurations of generally recognized compressors to perform a secondary function of regulating the inventory of working fluid within the thermodynamic cycle that the heat pump operates within.

Problems solved by technology

Furthermore by definition solar energy is a function of solar intensity and thus at the minimum is absent during the nighttime, unless significant thermal storage is utilized that is currently very expensive.

In addition, traditional solar collectors, particularly flat panel collectors, are temperature constrained due in large part to declining efficiencies as a function of temperature and the degradation of the working fluid which is often a mixture of a glycol and water.

Heat pumps also have significant limitations that limit temperature including the requirement for oil lubrication that would suffer oxidative destruction at the higher temperatures desired within heat pumps.

The combined limitations of each individual component being the solar collector and the heat pump presents significant challenges that are further exasperated when high integration using the same working fluid for both devices is realized.

The traditional solar systems utilize a working fluid that is a heat transfer fluid and thus isn't directly compatible as a thermodynamic cycle working fluid.

Furthermore by definition solar energy is a function of solar intensity and thus at the minimum is absent during the nighttime, unless significant thermal storage is utilized that is currently very expensive, the system will experience substantial changes in density according to operating and ambient conditions.

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