A system for air-conditioning and hot-water supply is configured to selectively perform a cooling operation and a heating operation. The system includes: an outdoor unit having a compressor and an outdoor heat exchanger; at least one or more indoor units each of which is connected to the outdoor unit and includes an indoor heat exchanger; a hot-water supply unit connected to the outdoor unit so as to be arranged in parallel to the indoor unit and including a refrigerant-water heat exchanger; a controller configured to monitor an occurrence of a request for hot-water supply from the hot-water supply unit during the cooling operation being performed at at least one indoor unit among the at least one or more indoor units, and then to start the heating operation in accordance with the request. The controller is further configured to transmit to each of the at least one or more indoor units, which is turned on for the cooling operation, a fan-stop command to stop a fan arranged at each indoor unit.

A load unit includes a water circuit chamber configured to accommodate at least a part of a water circuit configured to allow water to flow therethrough, a fan, an air inlet formed at a height positioned different from that of the air inlet and configured to suck indoor air therethrough, an air outlet configured to blow indoors the air sucked through the air inlet, and an air passage formed between the air inlet and the air outlet so as to be isolated from the water circuit chamber. A load-side heat exchanger is provided in the air passage.

A system for air-conditioning and hot-water supply is configured to selectively perform a cooling operation and a heating operation. The system includes: an outdoor unit having a compressor and an outdoor heat exchanger; at least one or more indoor units each of which is connected to the outdoor unit and includes an indoor heat exchanger; a hot-water supply unit connected to the outdoor unit so as to be arranged in parallel to the at least one or more indoor units and including a refrigerant-water heat exchanger; and a controller configured to monitor an occurrence of a request for hot-water supply from the hot-water supply unit during the cooling operation performed at at least one of the indoor units, and then to start the heating operation. The controller is further configured to determine a time point to resume the cooling operation based on at least one of an outdoor temperature and a target temperature of at least one indoor unit in the heating operation.

A system for air-conditioning and hot-water supply is configured to selectively perform a cooling operation and heating operation. The system includes: an outdoor unit having a compressor and an outdoor heat exchanger; a plurality of indoor units each of which is connected to the outdoor unit and includes an indoor heat exchanger; a hot-water supply unit connected to the outdoor unit so as to be arranged in parallel to the plurality of indoor units and including a refrigerant-water heat exchanger; and a controller configured to monitor an occurrence of a hot water request for hot-water supply from the hot-water supply unit during the cooling operation performed at at least one of the plurality of indoor units, and then to start the heating operation in accordance with the hot-water request. The controller is further configured to monitor an occurrence of an indoor-unit request from any one of the plurality of indoor units; and the controller is further configured to resume the cooling operation where the request is an increase request for an increase of load of the cooling operation.

A modular HVAC-SHW/DHW system that provides comfort conditioning, sanitary hot water, and ventilation in the buildings is disclosed. The system includes HVAC units, SHW/DHW units, and one or more air-to-water heat pump (AWHP) units fluidically connected to the HVAC units and the SHW/DHW units through at least one water-to-water heat pump (WWHPs). The AWHP units are configured to enable the exchange of heat between the environment and the WWHPs, and the WWHP is configured to enable the exchange of rejected heat between any of the AWHP units, the HVAC units, and the SHW/DHW units. The system is designed in a packaged form factor or modular design, where the components/units of the system are configured within a housing that is easily installable at the desired locations in the building.

A common vent application and an independent fan coil are disclosed for improved heating, cooling and water making in a building. The independent fan coil obviates the common boilers and chillers in addition to all the common heating and cooling distribution piping used in known systems. Instead, the fan coils contain all the hydronic heating components and all the components needed to provide AC without the use of common boilers and chilled water systems. The fan coils utilize common vent shaft ducting to exhaust the products of combustion generated for the independent tankless water heater. In addition, the common vent shaft may utilize a negative static pressure environment to exhaust the heat of rejection from the AC portion of the fan coil unit.

The present disclosure is directed to a single compressor HVAC system with hot gas reheat. The system includes a single compressor, a pair of condensers, a reheat heat exchanger, an evaporator, and an expansion device. Within the system, the refrigerant exiting the compressor is separated into two portions. In the cooling mode, the first and second portions of the refrigerant are directed from the compressor through the two condensers in parallel. In the reheat mode, the first portion of the refrigerant is directed through the first condenser, while the second portion of the refrigerant is directed through the reheat heat exchanger. The system also may include a head pressure control device that is designed to maintain the compressor discharge pressure within a desired range by adjusting the condenser fan speed.

This invention relates to a portable or fixed solar powered heating ventilation air conditioner (HVAC) system. The disclosed invention consists of the following major components. 1) Solar Hot Water Tank/Storage Tank, 2) Solar Generator, 3) Solar HVAC Heat Exchanger Unit, 4) Solar Grill, 5) Wireless Network Energy Monitoring System and 6) Supervisor Control and Data Acquisition (SCADA) system. Also included is a list of appliances that the HVAC system can be configured to function as: a) refrigerator, b) air purifier/fan, c) pressure cooker, d) drink dispenser, and e) pressurized hot water supply. The HVAC system and above listed appliances is designed to be used in homes, businesses, camping, military, hospitals, FEMA and in developing countries with very little electrical or plumbing infrastructure. The HVAC is capable of supplying all the above mention functions while being powered solely on solar power, solar hot water/fluid or geothermal and a chilled water source, therefore creating a NetZero Energy Machine that required no power from a utility grid when properly sized.

The present disclosure is directed to a single compressor HVAC system with hot gas reheat. The system includes a single compressor, a pair of condensers, a reheat heat exchanger, an evaporator, and an expansion device. Within the system, the refrigerant exiting the compressor is separated into two portions. In the cooling mode, the first and second portions of the refrigerant are directed from the compressor through the two condensers in parallel. In the reheat mode, the first portion of the refrigerant is directed through the first condenser, while the second portion of the refrigerant is directed through the reheat heat exchanger. The system also may include a head pressure control device that is designed to maintain the compressor discharge pressure within a desired range by adjusting the condenser fan speed.

Various embodiments include a system for controlling air temperature. The system can include a potable water piping system, a cooling system, and a heating system. The potable water piping system can include potable water supply piping and potable water return piping. The cooling system can be coupled to the potable water piping system. The cooling system can include a water-refrigerant heat exchanger; an air-refrigerant coil; a compressor coupled between the water-refrigerant heat exchanger and the air-refrigerant coil; and an expansion valve coupled between the water-refrigerant heat exchanger and the air-refrigerant coil. The heating system can be coupled to the potable water piping system. The heating system can include a hot water coil. The water-refrigerant heat exchanger can be coupled to the potable water supply piping and the potable water return piping. The hot water coil can be coupled to the potable water supply piping and the potable water return piping.