A cogeneration power plant and a method for operating a cogeneration power plant are provided, with a working medium being additionally cooled by a suitable heat pump between an outlet of a thermal heating device and an inlet of a power generator of the cogeneration process. The thermal power obtained in this manner is again available for heating purposes within the heat cycle.

In accordance with one embodiment, an air conditioner unit is provided. The air conditioner unit includes a heater housing having peripheral surfaces defining a housing interior, the peripheral surfaces including a first sidewall and a second sidewall spaced apart along the lateral direction. The air conditioner unit further includes a guide track extending along the lateral direction between the first sidewall and the second sidewall. The air conditioner unit further includes a blower fan, the blower fan including a blade assembly disposed within the interior and a motor connected to the blade assembly. The air conditioner unit further includes a heating unit comprising a first bracket and a second bracket spaced apart along the lateral direction. The heating unit further includes at least one heater bank extending along the lateral direction between the first bracket and the second bracket. The heating unit is movable along the guide track.

An air conditioner for a vehicle includes a cycle switching device. The cycle switching device switches a refrigerant cycle between a heating circuit, in which refrigerant flows through a heating heat exchanger, and a cooling circuit, in which refrigerant flows through a cooling heat exchanger. The air conditioner further includes an air conditioning controller, which controls the cycle switching device and includes a defroster control portion. The defroster control portion increases a temperature of air blown into the vehicle compartment through a defroster air outlet by a predetermined degree while keeping the refrigerant cycle at a state of the heating circuit for a predetermined time, when a defrosting operation is commanded to be performed during the heating circuit.

A container refrigeration device aims to prevent low temperature damage to freight in a container. The container refrigeration device includes: a temperature controlling section (101) configured to perform, in a switchable manner, first temperature control under which a temperature inside the container (C) is controlled based on a blown air temperature (Tss) and second temperature control under which the temperature inside the container (C) is controlled based on a suction air temperature (Trs) during dehumidification operation; and a control switching section (103) configured to switch the first temperature control to the second temperature control when the blown air temperature (Tss) is higher than the suction air temperature (Trs) during the dehumidification operation in which part of a refrigerant discharged from a compressor (30) is allowed to flow into a reheat heat exchanger (83).

There is disclosed a reversible heat pump system 100 and a method of operating a reversible heat pump system to control the temperature of a process fluid of a chiller system 500. In a cooling mode, a working fluid is circulated for co-current flow with a process fluid at a heat exchanger 104 functioning as an evaporator heat exchanger, whereas in a heating mode, the working fluid is circulated for counter-current flow with the process fluid at the same heat exchanger 104 functioning as a condenser heat exchanger.

A cooling box to control temperature so that an internal temperature of the cooling box becomes equal to a set temperature, includes: a control device including an temperature sensor to detect an ambient temperature of the box, and adjust a supply amount of warm air into the box after stopping supply of cold air thereinto based on the ambient temperature; and a door sensor to detect whether an opening connected with the interior of the cooling box is in either an open or closed state, when the door sensor detects a change of the opening from an open to closed state. The control device executes control so that the warm-air-supply-amount reaches a first value until a predetermined period has elapsed, and executes control so that the warm-air-supply-amount reaches a second value smaller than the first value after the predetermined period has elapsed.

An ammonia plant system upgrade utilizing both a direct and indirect multistage chilling system in the ammonia plant air compression train to increase process air flow to the secondary ammonia reformer of an existing ammonia plant as well as upgrades to provide more pre-heating along with increased process air flow.

When a first temperature difference is the difference between an inlet temperature of a first refrigerant and an outlet temperature of the first refrigerant in the heat exchanger for heating, and a second temperature difference is the difference between an inlet temperature of a second refrigerant and an outlet temperature of the second refrigerant in the heat exchanger for heating, the difference between the first temperature difference and the second temperature difference is held in a predetermined value or less by controlling the opening degree of a second expansion device.

Air conditioner units and methods for operating air conditioner units are provided. A method includes determining an operational state of each heater bank of a plurality of heater banks of the air conditioner unit, and determining a speed of a blower fan of the air conditioner unit when the operational state of every heater bank is active. The method further includes comparing a blower fan input voltage to a voltage threshold value when the speed is a low speed, and deactivating one of the plurality of heater banks when the blower fan input voltage is less than the voltage threshold value.

Certain Embodiments provide an energy exchange system that includes a supply air flow path, an exhaust air flow path, an energy recovery device disposed within the supply and exhaust air flow paths, and a supply conditioning unit disposed within the supply air flow path. The supply conditioning unit may be downstream from the energy recovery device. Certain embodiments provide a method of conditioning air including introducing outside air as supply air into a supply air flow path, pre-conditioning the supply air with an energy recovery device, and fully-conditioning the supply air with a supply conditioning unit that is downstream from the energy recovery device.