Chiller control systems and methods for chiller control use iterative modeling of cooling towers, heat exchangers, and pumps to determine the feasibility of integrated free cooling and the ability to take advantage of free cooling. The control systems and control methods can further include selecting the parameters for operating in the free cooling or integrated free cooling mode to improve efficiency and/or reduce energy consumption when operating in these modes. The models can have inputs and outputs that feed into one another, and converge at a solution over multiple iterations. The feasibility of integrated free cooling can be based on providing cooling to a cooling load process fluid at a heat exchanger. The availability of free cooling can be based on the cooling provided at the heat exchanger achieving a target temperature for the cooling load process fluid.

The present invention discloses a heating and cooling system of a modular residential building at least comprising: a) a building framework, b) a number of flat modules (1.0), c) a number of front elements (6.04), d) at least two gable elements (6.03), e) at least one roof element (6.02), and f) a plurality of horizontal and vertical heating and cooling canals, where the building frameworks includes fastening means (5.02) for securing the flat modules (1.0) to the building framework with a horizontal and vertical distance between neighbouring flat modules (1.0) thereby creating cavities there between where cavities are utilized as the plurality of horizontal and vertical heating and cooling canals.

Each of plural temperature adjustment apparatuses variably adjusts the amount of heat exchange between an inflow medium, which is a liquid medium supplied to a corresponding indoor heat exchanger, and an outflow medium, which is a liquid medium discharged from the corresponding indoor heat exchanger. Each of the plural temperature adjustment apparatuses reduces the heat exchanging capacity of the corresponding indoor heat exchanger by increasing the amount of heat exchange between the inflow medium and the outflow medium when the heat exchanging capacity of the corresponding indoor heat exchanger is larger than the indoor load. When there is no temperature adjustment apparatus in which the amount of heat exchange between the inflow medium and the outflow medium is set to the minimum, the heat source apparatus reduces the heating capacity or the cooling capacity for changing the temperature of the liquid medium.

Each of plural temperature adjustment apparatuses variably adjusts the amount of heat exchange between an inflow medium, which is a liquid medium supplied to a corresponding indoor heat exchanger, and an outflow medium, which is a liquid medium discharged from the corresponding indoor heat exchanger. Each of the plural temperature adjustment apparatuses reduces the heat exchanging capacity of the corresponding indoor heat exchanger by increasing the amount of heat exchange between the inflow medium and the outflow medium when the heat exchanging capacity of the corresponding indoor heat exchanger is larger than the indoor load. When there is no temperature adjustment apparatus in which the amount of heat exchange between the inflow medium and the outflow medium is set to the minimum, the heat source apparatus reduces the heating capacity or the cooling capacity for changing the temperature of the liquid medium.

A dehumidifier has a main body and a main tank. The main body has a secondary tank, a pump, and a retracting mechanism. A conduit portion of the retracting mechanism is mounted through and into the main tank, so the pump can draw water from the secondary tank and into the main tank. The main tank is mounted beside the main body and can be drawn upward to separate from the main body. The main tank has a first inclined surface. When the main tank is moved upward, the first inclined surface pushes the retracting mechanism, so the conduit portion retracts and is moved away from a moving path of the main tank when the main tank is being drawn upward. With the main tank mounted beside the main body, the main tank facilitates water pouring.

A dehumidifier has a main body and a main tank. The main body has a secondary tank, a pump, and a retracting mechanism. A conduit portion of the retracting mechanism is mounted through and into the main tank, so the pump can draw water from the secondary tank and into the main tank. The main tank is mounted beside the main body and can be drawn upward to separate from the main body. The main tank has a first inclined surface. When the main tank is moved upward, the first inclined surface pushes the retracting mechanism, so the conduit portion retracts and is moved away from a moving path of the main tank when the main tank is being drawn upward. With the main tank mounted beside the main body, the main tank facilitates water pouring.

An air conditioning apparatus is provided that may include an outdoor unit including a compressor and an outdoor heat exchanger and through which a refrigerant is circulated, an indoor unit through which a fluid, such as water is circulated, and at least one heat exchange device including a heat exchanger in which the refrigerant and the fluid are heat-exchanged with each other. The at least one heat exchange device may include a high-pressure guide tube that extends from a high-pressure gas tube of the outdoor unit so as to be connected to a first side of the heat exchanger, a low-pressure guide tube that extends from a low-pressure gas tube of the outdoor unit so as to be combined with the high-pressure guide tube, a liquid guide tube that extends from a liquid tube of the outdoor unit so as to be connected to a second side of the heat exchanger, and a solenoid valve installed in the high-pressure guide tube or the low-pressure guide tube to perform an opening and closing operation so as to allow the refrigerant to flow in a first direction. The high-pressure gas tube and the low-pressure gas tube may be connected to each other by a single gas tube, and when the indoor unit performs a cooling operation or a heating operation, flow of refrigerant in the first direction may be blocked in a state in which power is applied to the solenoid valve.

An environmental control system comprises a fluid flow path which has a pump and circulates liquid to a first heat exchanger in a first room and to a second heat exchanger in a second room. The fluid flow path comprises a pump. A user inputs a target temperature for the first room via a first user interface that is located in the first room, which is communicated to the control unit and a sensor located in the room communicates the temperature in the first room to the control unit. A user inputs a target temperature for the second room via a second user interface that is located in the second room, which is communicated to the control unit and a sensor located in the room communicates the temperature in the second room to the control unit. The control is physically isolated from the user interfaces and temperatures sensors.

An environmental control system comprises a fluid flow path which has a pump and circulates liquid to a first heat exchanger in a first room and to a second heat exchanger in a second room. The fluid flow path comprises a pump. A user inputs a target temperature for the first room via a first user interface that is located in the first room, which is communicated to the control unit and a sensor located in the room communicates the temperature in the first room to the control unit. A user inputs a target temperature for the second room via a second user interface that is located in the second room, which is communicated to the control unit and a sensor located in the room communicates the temperature in the second room to the control unit. The control is physically isolated from the user interfaces and temperatures sensors.

A single unit HVAC system for a unit in a multi-unit building comprises a first heat exchanger thermally connected to a riser stack, a plurality of fan coils, each fan coil comprising a unit heat exchanger and a motor and fan assembly wherein, in operation, the motor and fan assembly delivers air to a location in the unit, and a closed loop fluid flow path extending between the first heat exchanger and the plurality of unit heat exchangers. In operation, the first heat exchanger exchanges heat between the riser stack fluid and the closed loop fluid, each unit heat exchanger exchanges heat between the closed loop fluid and air that is delivered to a different room in the unit.