HVAC Modulating Valve for Parallel Reheat and Dehumidification Control
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Solution Overview
Problem
Existing HVAC systems face challenges in acutely controlling both temperature and humidity of the supply air flow, making it difficult to achieve desirable comfort cooling and dehumidification simultaneously.
Innovation Solution
Incorporating a modulating valve in the refrigerant circuit that directs refrigerant flow between a condenser coil and a reheat coil, allowing for precise apportionment based on detected operating parameters of the air flow, enabling the system to adjust refrigerant distribution to achieve target temperature and humidity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vapor compression circuit is used to cool and dehumidify supply air, then cooling and dehumidification are achieved, but acute control of temperature and humidity is difficult
Solution Approach 1:
The refrigerant flow from the compressor is divided into separate streams: one going to the evaporator for cooling/dehumidification and another going to the reheat coil for temperature adjustment. This segmentation allows independent control of humidity (via evaporator) and temperature (via reheat coil), achieving acute control of both parameters simultaneously
Solution Approach 2:
The reheat coil acts as an intermediary component between the evaporator and the supply air outlet. It receives a portion of the compressed refrigerant and uses it to reheat the air after dehumidification, providing fine-tuned temperature control without affecting the humidity control achieved by the evaporator
2Temperature
If refrigerant flow is directed to condenser coil for cooling, then cooling capacity is improved, but humidity control and temperature adjustment become difficult
Solution Approach 1:
A modulating valve is used to dynamically adjust the proportion of refrigerant flow directed to the reheat coil versus the condenser coil. This dynamic control allows the system to adapt to varying temperature and humidity demands, providing flexible and precise control of supply air conditions
Solution Approach 2:
The system changes the distribution parameter of refrigerant flow between different coils based on detected operating conditions. By adjusting the flow proportion to the reheat coil versus the condenser coil, the system can achieve desired temperature and humidity levels while maintaining operational flexibility
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
This configuration improves the HVAC system's ability to acutely control both temperature and humidity of the supply air flow, enhancing the conditioning of the space by allowing for precise adjustments to achieve desirable comfort levels.
Implementation Method 1
a first condenser coil of a refrigerant circuit, wherein the first condenser coil is configured to receive a first refrigerant flow from a compressor of the refrigerant circuit
Implementation Method 2
the first condenser coil is configured to receive a first refrigerant flow from a compressor of the refrigerant circuit
Implementation Method 3
direct the second refrigerant flow to a second condenser coil of the refrigerant circuit and to a reheat coil of the refrigerant circuit
Data Source
AI summary
A heating, ventilation, and/or air conditioning (HVAC) system includes a first condenser coil of a refrigerant circuit, wherein the first condenser coil is configured to receive a first refrigerant flow from a compressor of the refrigerant circuit, a modulating valve of the refrigerant circuit, and a control circuitry communicatively coupled to the modulating valve. The modulating valve is configured to receive a second refrigerant flow from the compressor and configured to direct the second refrigerant flow to a second condenser coil of the refrigerant circuit and to a reheat coil of the refrigerant circuit in a parallel flow arrangement, and the control circuitry is configured to operate the modulating valve to apportion the second refrigerant flow between the second condenser coil and the reheat coil based on a detected operating parameter of an air flow directed across the reheat coil.