A seasonal heat-cold energy storage and supply pool, including a salt-free solar pool at the upper layer and an energy storage pool at the lower layer. The salt-free solar pool and the energy storage pool are separately connected to a water source. The salt-free solar pool includes a pool bottom and a pool wall. The pool bottom of the salt-free solar pool functions as a top cover of the energy storage pool. The energy storage pool includes a wall and a bottom which are a composite layer. The energy storage pool is provided with a heat exchange coil configured to implement heat exchange in the energy storage pool for supplying heat and cold for an external user. The salt-free solar pool and the energy storage pool are communicated through controllable valves at the pool bottom of the salt-free solar pool.

A seasonal heat-cold energy storage and supply pool, including a salt-free solar pool at the upper layer and an energy storage pool at the lower layer. The salt-free solar pool and the energy storage pool are separately connected to a water source. The salt-free solar pool includes a pool bottom and a pool wall. The pool bottom of the salt-free solar pool functions as a top cover of the energy storage pool. The energy storage pool includes a wall and a bottom which are a composite layer. The energy storage pool is provided with a heat exchange coil configured to implement heat exchange in the energy storage pool for supplying heat and cold for an external user. The salt-free solar pool and the energy storage pool are communicated through controllable valves at the pool bottom of the salt-free solar pool.

A building using solar energy for heating and cooling is disclosed. The building comprises a fluid channel arranged for a fluid to transfer absorbed solar heat, a solar heat storage bank to store and supply the solar heat, and a mechanism for directing and controlling the flow of the fluid throughout the building. A insulating glass style solar heat collector (IGSHC) as a building element comprises a insulating glass means; a replaceable solar heat absorber removably received in a slot in the hollow space of the insulating glass, and separates the space into two subspaces; a fluid channel is thermally connected to the solar heat absorber for heat transferring; and a mechanism for directing and controlling the flow of said fluid.

A pool system may include a solar heating system for heating water of a swimming pool or spa comprising. The solar heating system includes a collector which may receive water from the swimming pool or spa and heat a flow of water from the swimming pool or spa using solar radiation. The solar heating system includes one or more control devices, which may control a flow rate of water through the solar heating system and/or a pressure of water through the solar heating system.

A pool system may include a solar heating system for heating water of a swimming pool or spa comprising. The solar heating system includes a collector which may receive water from the swimming pool or spa and heat a flow of water from the swimming pool or spa using solar radiation. The solar heating system includes one or more control devices, which may control a flow rate of water through the solar heating system and/or a pressure of water through the solar heating system.