Abstract: A method and a device for converting low temperature heat energy into mechanical or electrical energy, wherein at least one liquid or gas chamber performs work in response to temperature variations. According to the invention one or more expansible and compressible containers are arranged in said chamber. Each container contains a refrigerant capable of shifting from liquid phase to gas phase, and vice versa, thereby producing or contributing the work of the working gas or liquid. The refrigerant is alternatingly heat exchanged with two sources of low temperature heat energy, for example ground accumulators, of different temperatures, thereby causing alternating expansion and contraction of said containers.

Abstract: A novel method and device is provided herein for improved storage and recovery of low temperature thermal energy from a mass capable of storing such energy by heat exchange with a heat carrying medium, e.g. in combination with a heat pump. The conduit system for the heat carrying medium is arranged at the underside of a continuous bed which is placed on or in said mass, the latter being e.g. a body of water, watery or solid ground. The bed is preferably a floating plate construction of heat insulating material. Preferably at least part of the upper side of the bed is arranged to absorb solar radiation, which energy is transferred to said mass by washing the bed surface with water from the mass or another source. Especially on water or watery ground the bed may provide a support for e.g. plantations, grounds for ball sports etc.

Abstract: A system for drying humid air to be used for ventilating a space defined by an enclosing covering, wherein said covering contains a first conduit system for circulating a cooling fluid, and a second conduit system for circulating humid air to be dried. At least part of said first system is in heat exchanging contact with said second system so as to cause condensation of water vapor contained in the humid air flowing in said second conduit system. Means are preferably provided for collecting the condensed water.

Abstract: The invention relates to a compact heating assembly of the heat pump type, comprising a heat pump circuit having a compressor, an evaporator and a condenser, wherein the evaporator and condenser parts, together with means for heat exchanging heat carrying fluids against the same, are arranged in a housing. The evaporator and its heat exchanger means and the condenser and its heat exchanger means substantially form an essentially vertical helical conduit system which encloses an inner space, wherein the compressor, possible circulation pumps, etc. are arranged. The device can be burrowed in the ground, and the inner space is accessible via an inspection cover arranged at the top.

Abstract: A system for heating and ventilating objects and spaces surrounded by an outer covering, such as rooms in buildings. The system includes a heat pumping device for converting low-temperature energy to high-temperature energy useful for heating purposes. The condenser as well as the evaporator of the heat pumping device are divided into several series-connected sections operating at progressively or step-wise decreasing condenser temperatures and progressively increasing evaporator temperatures. The outer covering of the space or object to be heated contains an air inlet system and an air outlet system, each of said systems having several series-connected sections located at different distances from the outer surfaces of the covering, thus being subjected to different temperatures related to the temperature gradient through the outer covering.