Dehumidification >> Dehumidify A Basement Without Electricity

The reheat energy is free and the penalties of increased refrigeration or the expense of additional cooling energy are avoided. The net effect of this cycle is identical to that of the run-around enhancements with two beneficial exceptions: Dehumidify A Basement Without Electricity (1) A precooling coil is not required and (2) the row depth of the reheat coil is less than that of the heat pipe or run-around coil. A limitation of this method is the small amount of heat available.

 For example, in an R-22 system with liquid refrigerant entering the reheat coil at 95 F and leaving at 55 F, the total amount of heat available is 2000 Btu per ton-hr. Assuming an air-circulation rate of 350 cfm per ton, this results in a 5.2-F rise in air temperature across the reheat coil. With 100-percent outside-air systems at less than 200 cfm per ton, Dehumidify A Basement Without Electricity the temperature rise is approximately 10 F. If the reheat from this coil is not sufficient, an additional heating coil using some other form of energy is required. This adds to the first cost, the space required, and the control complexity.

 A 5-F rise in air temperature in a 350-cfm-per-ton system may appear small; however, when this system is retrofitted to an existing unit, Dehumidify A Basement Without Electricity the amount of moisture removal increases by approximately 50 percent because of the combined effects of greater moisture removal per minute by the cooling/dehumidifying coil and longer run time attributed to the increase in supply-air temperature by the reheat coil. Figure 8 shows the piping of the refrigerant-liquid/reheat coil.

 The reheat coil is part of the refrigerant liquid line, with the additional refrigerant charge equal to the volume of the reheat-coil tubes and additional piping. Some manufacturers balk at installing a liquid-subcooling/air-reheating coil in a system Dehumidify A Basement Without Electricity (the effect of the coil on the refrigeration system is the same as that of an additional 20 or 30 ft of liquid line in a 60-F room).

 If a winter heating source is located upstream from the refrigerant-liquid-reheat coil, Dehumidify A Basement Without Electricity then the refrigerant circuit must be checked to ensure that the refrigerant has a path to the receiver and is not blocked by isolation valves. If the liquid-refrigerant coil is isolated by line valves during the winter, then high pressures could be a problem.

 Advantages. The advantages of refrigerant-subcooling/air-reheating dehumidification are: • There are no water circuits to freeze or ethylene-glycol charges to maintain. • Electrical connections are not required. • Controls are not required for most systems. • Dehumidify A Basement Without Electricity Only a single coil is required in the air stream leaving the main cooling coil.

 ÃƒÂ‚• Air resistance is approximately half of that of the previous enhancements. Disadvantages. Disadvantages of refrigerant-subcooling/air-reheating dehumidification are: • The cost of the additional refrigerant charge and, in retrofit applications, the isolation, evacuation, Dehumidify A Basement Without Electricity and recharging of the refrigerant circuit. • Possible bursting pressures if relief provisions are not made when the coil is located downstream from the heating apparatus. • Concerns about refrigerant migration and inventory management, particularly in heat-pump refrigeration cycles.

 ÃƒÂ‚• Controls, if required, add expense. REFRIGERANT-HOT-GAS OR CONDENSER-WATER REHEAT Intuitively, reheating a cooled air stream using hot discharge gas from a refrigerant compressor makes sense.  However, Dehumidify A Basement Without Electricity it mitigates only the last of the four penalties of ordinary reheat systems mentioned in the sidebar. The refrigeration plant still must be larger by the amount of reheat. Also, the owner must pay the increased operating cost of the amount of cooling canceled by the reheat. Refrigerant hot gas or condenserwater reheat is inferior to the other dehumidification enhancements, particularly when reheat is required on peak design days.

 This is because it requires a larger cooling-generation system and increased cooling-system operating costs. If reheat is required only on mild days and  Dehumidify A Basement Without Electricityreheat from liquid refrigerant is not a viable solution, Dehumidify A Basement Without Electricity this enhancement can be considered along with the recuperative-dehumidification enhancements discussed previously. Designers of refrigeration systems using hot gas for reheat are cautioned that the design is not as simple as it first appears. When the reheat coil is reheating, the cycle is obvious.

 When the control no longer requires reheat, the reheat coil will be at a low refrigerant pressure and the coil will fill with condensed liquid refrigerant. When the control again calls for reheat, Dehumidify A Basement Without Electricity this liquid refrigerant must be displaced for the reheat coil to function. The system must incorporate a larger refrigerant storage vessel and additional refrigerant charge to accommodate the liquid refrigerant that is alternately stored in the reheat coil.

 Designers have tried numerous ways, Dehumidify A Basement Without Electricity including check valves at the reheatcoil outlet, to circumvent this problem. If the check valve holds, the reheat coil will be under very low pressure and invite leaks. Most valves have a small leakage rate, which, in this case, means that the system still must be designed with the extra refrigerant charge and receiver. Some designers suggest bleeding a small amount of hot gas to the reheat coil when reheat is not required. This accomplishes nothing.

 The coil remains filled with liquid refrigerant. Some designers vent the reheat coil to compressor suction pressure when reheat is not required. Although this can be an acceptable solution, Dehumidify A Basement Without Electricity it adds the risk of refrigerant-liquid flood back damaging the compressor when the system changes from reheat to no reheat. A variation of hot-gas reheat involves the use of the warm water leaving a water-cooled refrigerant condenser for reheat.

 This simplifies the refrigerant cycle and is a better alternative if the refrigerant cycle is water-cooled. However, Dehumidify A Basement Without Electricity penalties 1, 2, and 3 from the sidebar still apply. CONCLUSION In many cases, the solution to indoor-air quality and energy efficiency problems can be found in 60- year-old technologies.

 The inventors of these technologies were motivated not so much by the cost of energy, Dehumidify A Basement Without Electricity but by the need to reduce compressor size to the limited range of available refrigeration compressors and to keep electrical motor size to a minimum because of the limited peak power available from the electrical utilities of the 1930's.

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