Air conditioner system, air conditioner control device, air conditioner method, and program for control using water circulation and based on indoor latent and sensible heat loads
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Solution Overview
Problem
Existing water-type air-conditioning systems fail to effectively condition air at appropriate sensible and latent heat capacities corresponding to the respective loads, lacking techniques to manage sensible and latent heat loads efficiently.
Innovation Solution
An air-conditioning system with a heat source unit, air conditioner, and water circulation means, where the water temperature is controlled based on indoor humidity and temperature, allowing for dynamic adjustment of sensible and latent heat capacities through the air-conditioning control device, which determines target water temperatures and flow rates to match indoor conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water temperature is lowered to increase latent heat capacity for dehumidification, then latent heat capacity is improved, but sensible heat capacity decreases
Solution Approach 1:
The system dynamically adjusts water temperature based on real-time detection of indoor humidity and temperature conditions. When humidity is high, water temperature is lowered to increase latent heat capacity for dehumidification. When temperature is high, water temperature is maintained higher to preserve sensible heat capacity for cooling. This dynamic adjustment resolves the contradiction by making heat capacity distribution adaptive rather than fixed.
Solution Approach 2:
The control device changes the temperature parameter of supply water based on detected indoor conditions. By varying the water temperature parameter, the system optimizes the balance between latent and sensible heat capacities to match the dominant heat load type (humidifying vs. cooling demand), thereby resolving the trade-off between the two heat capacities.
2Quantity of substance
If water temperature is lowered to match latent heat load, then latent heat conditioning is improved, but energy consumption increases
Solution Approach 1:
The system uses humidity detection means to continuously monitor indoor humidity levels and provides feedback to the control device. Based on this feedback, the control device adjusts water temperature only when dehumidification is actually needed, rather than maintaining low temperature continuously. This feedback mechanism ensures low temperature operation (high latent heat capacity) is applied only when beneficial, optimizing energy consumption.
Solution Approach 2:
The system applies low water temperature (excessive cooling action) only partially - specifically when humidity detection indicates high moisture content requiring dehumidification. When humidity is acceptable, the system reduces cooling intensity, avoiding unnecessary energy consumption while maintaining adequate latent heat capacity when needed.
3Productivity
If water circulation flow rate is increased to improve heat exchange efficiency, then heat exchange efficiency is improved, but pump power consumption increases
Solution Approach 1:
The water circulation means dynamically adjusts flow rate based on detected indoor temperature and humidity conditions. When heat load is high (either sensible or latent), flow rate is increased to improve heat exchange efficiency. When heat load is low, flow rate is reduced to minimize pump power consumption. This dynamic adjustment resolves the contradiction by matching circulation intensity to actual conditioning demands.
Solution Approach 2:
The control device changes the flow rate parameter of water circulation based on detected indoor conditions and calculated heat loads. By varying flow rate to match the magnitude of heat exchange required, the system optimizes the balance between heat exchange efficiency and pump energy consumption, avoiding both excessive and insufficient circulation.
4Measurement precision
If separate control of sensible and latent heat capacities is implemented, then air conditioning precision is improved, but device complexity increases
Solution Approach 1:
The control device performs multiple functions using a single integrated system: it detects both temperature and humidity, calculates both sensible and latent heat loads, determines optimal water temperature and flow rate, and controls the water circulation means. This multi-functional approach achieves precise separate control of sensible and latent heat capacities without requiring separate independent control systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The system merges temperature detection, humidity detection, heat load calculation, and water circulation control into a single integrated control device. By combining these functions, the system achieves precise control of both sensible and latent heat capacities while avoiding the complexity of multiple separate control systems working in parallel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables air conditioning at appropriate sensible and latent heat capacities, optimizing energy consumption and comfort by dynamically adjusting water temperatures and flow rates in response to indoor conditions, thereby improving the system's efficiency and effectiveness.
Implementation Method 1
a heat source unit 1 configured to supply temperature-controlled water, an air conditioner 2 configured to perform heat exchange between the water supplied by the heat source unit 1 and air taken in from an indoor space
Implementation Method 2
water circulation means for circulating the water between the heat source unit and the air conditioner
Data Source
AI summary
An air-conditioning system includes a heat source unit, an air conditioner connected via piping to the heat source unit and configured to perform heat exchange between water supplied by the heat source unit and indoor air, a water circulation device for circulating the water between the heat source unit and the air conditioner, and an air-conditioning control device. The air-conditioning control device controls the heat source unit to lower temperature of the water flowing into the air conditioner, in accordance with an increase in an indoor humidity, and controls the water circulation device to lower temperature of the water flowing from the air conditioner back to the heat source unit, in accordance with an increase in an indoor temperature.