Energy Efficient Solar-Heat Pump Dryer System

Inventor and Patent Holder  Ivan Angelov

Introduction     Invention   Operation   Energy fficiency

AirSet Dryer System is powered by solar autonomous air-to-air heat pump. It allows for operation with variable capacity thanks to variable refrigerant flow and compressor speed. They are   dynamically adjusted in real time to match the current conditions and heat load using the lowest possible amount of electric power so as to reduce the number of solar PV panels needed to operate the system. The base configuration requires only three PV solar panels. Energy efficiency is based on "air to air" or "ground to air" heat pump/s and recuperation of waste heat from exhaust warm air from outside heat pump unit/s. Patented AirSet dryer designed for autonomous operation but can  be connected to power grid, as well.

AirSet   solar air-to-air heat pump uses a hermetically sealed permanent magnet brushless DC compressor for maximum service life; with specially designed controls and a digital frequency driver send power to the compressor using alternating pulses of DC current at a rate between 25 Hz and 125 Hz, depending on requirements, matching the compressor capacity to the operating conditions.

By contrast, a normal air-to-air heat pump with a fixed capacity must run at a steady 50Hz AC and must continually turn itself on and off to satisfy the thermostat, wasting energy. Our DC design avoids the use of a DC-AC inverter, and eliminates the rectifier circuits found in normal high efficiency air conditioning systems, thus avoiding up to 23% of power conversion losses that would occur when running a high efficiency air conditioner from solar power or other DC source through an inverter.

Our systems works with standard PV panels and need a minimum of 600 watts to operate, with a minimum of four standard deep cycle solar batteries configured in series/parallel for DC operation along with an external standard solar charge controller.

AirSet provides a solar electric power generation system used for a low temperature air drying.

A preferred embodiment of a high efficiency dehumidifier is a vapor compression beat pump system which includes an evaporator, a compressor, a condenser  and a blower . The principle of operation is well known in the field of refrigeration: ambient air is blown through the evaporator, which is kept cold by evaporation of a refrigerant. The moisture in the air condenses on the evaporator and is drained away as condensate. The cold air which exits the evaporator then enters the condenser, where it is reheated; then, the now dry and warm air is sent to the point of use.

Such a dehumidifier can be improved by the use of a heat pipe heat exchanger, which transfers heat between the warm entering air and the cold air leaving the evaporator coil as shown in U.S. Pat. Nos. 5,404,938, 4,938,035, and Taiwanese and Chinese patents of inventor Khanh Dinh. The use of the dehumidifier heat pipe invented by Dinh can reduce the power consumption of the heat pump by up to 50%, saving a large amount of energy.

The dehumidifier heat pump can also use an internal combustion engine for its power source, with a series air flow configuration such as in FIG. 4a or with a parallel air flow configuration . In this invention, the dehumidifier is further improved by recovering waste heat from the internal combustion engine which is used to power the heat pump. Waste heat from the engine exhaust can be recovered directly by Seebeck waste heat converter to usable power




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