Control system of Heat and Cold Storage Optimization for Heating and Cooling Devices using Heat Pump Type

Abstract

Control system and method for optimization of heat or cold storage in heating and cooling devices using heat pump type were developed in this study. The heat pump will be activated by electric power with light duty in response to the fluctuation of electric charges only through building a simple and independent system.Methods/Statistical analysis: Development of control system and its method for optimization of heat and cold storage in heating and cooling devices using heat pump type can be provided not only to optimize the use of electric power but also to solve an existing problem of household that is not included smart grid system. The compositions of this system to achieve the goal are divided as follows; a sensor section that is able to measure temperature and rate of flow between inflow water and outflow water that is installed inlet and outlet water of heat/cool tank system, an input section to enter not only the load value according to seasonal and hourly charges but heat pump capacity and heat/cool tank capacity as a reference of activating heat pump and controlling heat/cool storage, a storage section that is to save temperature setting value for the load level of seasonal and hourly charges through input section as well as heat pump capacity and heat/cold controlling.Findings: Overall structure of system is composed of the section of sensor to measure temperature and flow value, input with one more key input tool, storage for temperature setting value, optimal control for heat/cool storage, driving relay to control heat pump, display in each temperature as well as pump capacity and communication. The optimal control section is also included an arithmetic operations part that of temperature variation, total heat used, heat pump uptime and capacity control of a total heat/cold storage. The communication section can be selected one of the following available options; a standard RS-232 link or RS485 serial communications, a wired or wireless internet communication interface, and a near-field communication interface like ETHERNET to communicate with an external equipment.Improvements/Applications Use of electricity with lowest load level in response to the electric power rate fluctuations based seasonal and hourly charges makes it possible to activate heat pump or to control heat/cool storage. And then, electricity rate can be greatly reduced through optimized use of electric power based on the simple and independent system configuration of control system and method for optimization of heat/cold storage that had been researched in this study.