Sinvent As

Norsk Hydro, A.s.

Jostein Pettersen

Petter Nekså

Geir Skaugen

Håvard Rekstad

Kåre Aflekt

Armin Hafner

Gholam Reza Zakeri

Arne Jakobsen

Einar Brendeng

Gustav Lorentzen

Trond Andresen

Espen Tøndell

Munan Elgsæther

Munan Elgæther

Peter Grundlach

Leif Folkedal

Roar R Bang

The present invention involves a compression refrigeration system including a compressor, a heat rejector, expansion means and a heat absorber connected in a closed circulation circuit that may operate with supercritical high-side pressure. An apparatus and method are provided to optimize energy efficiency.

Method of operation and regulation of a vapour compression system

A compression refrigeration system that includes a compressor, a heat rejector, expansion means and a heat absorber connected in a closed circulation circuit that may operate with supercritical high-side pressure.

Vapor compression heat pump system

Reversible vapor compression system including a compressor (), an interior heat exchanger (), an expansion device () and an exterior heat exchanger () connected by means of conduits in an operable relationship to form an integral main circuit. A first device is provided in the main circuit between the compressor and the interior heat exchanger, and a second device is provided on the opposite side of the main circuit between the interior and exterior heat exchangers to enable reversing of the system from cooling mode to heating mode and vice versa. The first and second device for reversing of the system include a first and second sub-circuit (A respectively B) each of which is connected with the main circuit through a flow reversing device (andrespectively). Included in the system solution is a reversible heat exchanger for refrigerant fluid, particularly carbon dioxide. It includes a number of interconnected sections arranged with air flow sequentially through the sections. The first and last sections are inter-connected whereby the refrigerant fluid flow in the heat exchanger can be changed from heating to cooling mode by means of flow changing devices provided between the respective sections.

Reversible vapor compression system

A compression refrigeration system includes a compressor (), a heat rejector (), expansion device () and a heat absorber () connected in a closed circulation circuit that may operate with supercritical high-side pressure. The refrigerant charge and component design of the system corresponds to a stand still pressure inside the system which lower than 1.26 times the critical pressure of the refrigerant when the temperature of the whole system is equalized to 60&#xb0; C. Carbon dioxide or a mixture of a refrigerant containing carbon dioxide may be applied as the refrigerant in the system.

Compression system for cooling and heating purposes

A method of defrosting of a heat exchanger (evaporator) in a vapor compression system including, downstream of a heat exchanger (evaporator) () to be defrosted, at least a compressor (), a second heat exchanger (condenser/heat rejecter) (), and an expansion device () connected by conduits in an operable manner to form an integral closed circuit. The heat exchanger () to be defrosted is subjected to essentially the same pressure as the compressor's () discharge pressure. Thus, the heat exchanger () is defrosted as the high-pressure discharge gas from the compressor () flows through to the heat exchanger, giving off heat to the heat exchanger (). In the circuit, in connection with the expansion device () a first bypass loopwith a first valve ('), is provided. A pressure reducing device (&#x2032;) is provided in a second bypass loop in conjunction with a second valve (&#x2032;&#x2033;) disposed downstream of the heat exchanger () being defrosted, whereby the first valve (&#x2032;) is open and the second valve (&#x2032;&#x2033;) is closed when defrosting takes place.

Method and arrangement for defrosting a vapor compression system

Heat exchanger

Trans-critical vapor compression device

Transcritical vapor compression cycle device with a variable high side

High side pressure in a transcritical vapor compression cycle system is regulated by varying a liquid inventory of a low pressure refrigerant receiver provided in a circuit of the system. The circuit includes a compressor, a gas cooler, a throttling valve, an evaporator and the receiver connected in series in a closed circuit operating at supercritical pressure in a high pressure side of the circuit. The degree of opening of the throttling valve is controlled to regulate the high side pressure in the circuit. It is possible to control capacity, and it also is possible to achieve minimum energy consumption for a given capacity requirement by regulating high side pressure.

Method and device for high side pressure regulation in transcritical

Growing community of inventors

Ranheim, Norway

Jostein Pettersen