Greenhouse air humidity and/or temperature control
AssigneeNW Systems Ab Oy
InventorDaniel Nordberg
Life of this patent
Estimating the term…
Abstract
A control arrangement for controlling the temperature and/or humidity conditions of a greenhouse. Greenhouse air flow from the greenhouse is received in a first heat exchanger. Heat is exchanged between the greenhouse air flow and an ambient air flow in the first heat exchanger. The first heat exchanger removes moisture from the greenhouse air flow by condensing. After the exchange of heat in the first heat exchanger, the greenhouse air flow and the ambient air flow are received in a second heat exchanger. Heat is exchanged between the greenhouse air flow and the ambient air flow in the second heat exchanger. The second heat exchanger removes moisture from the greenhouse air flow by adsorption. After the second heat exchanger, the greenhouse air flow returns to the greenhouse.
Claims15
A control arrangement for controlling the temperature and/or humidity conditions of a greenhouse, comprising:
- first piping for receiving greenhouse air flow from the greenhouse and returning the greenhouse air flow back to the greenhouse;
- second piping for carrying an ambient air flow for circulating air originating exterior to the greenhouse;
- a first heat exchanger connected to the first and second piping for exchanging heat between the greenhouse air flow and the ambient air flow, the first heat exchanger being configured to remove moisture from the greenhouse air flow by condensation;
- and
- a second heat exchanger connected to the first piping to be fluidly connected in series with the first heat exchanger downstream of the first heat exchanger in the greenhouse air flow, the second heat exchanger being further connected to the second piping to be fluidly connected to the ambient air flow downstream of the first heat exchanger, wherein the second heat exchanger is provided for exchanging heat between the greenhouse air flow and the ambient air flow, the second heat exchanger being configured to remove moisture from the greenhouse air flow by adsorption.
A method of dehumidifying air in a greenhouse, comprising:
- receiving greenhouse air flow from the greenhouse in a first heat exchanger;
- exchanging heat between the greenhouse air flow and an ambient air flow in the first heat exchanger, wherein the first heat exchanger removes moisture from the greenhouse air flow by condensing;
- receiving the greenhouse air flow and the ambient air flow in a second heat exchanger after the exchanging heat in the first heat exchanger;
- exchanging heat between the greenhouse air flow and the ambient air flow in a second heat exchanger, wherein the second heat exchanger removes moisture from the greenhouse air flow by adsorption;
- and
- returning the greenhouse air flow to the greenhouse.
Dependencies are inferred from the claim text.