Trane Heat Pump Condenser
The Condenser for Air Conditioners and Heat Pumps
The condenser coil receives the high pressure high temperature refrigerant vapor from the compressor and immediately begins to remove heat from the refrigerant vapor. As the refrigerant vapor makes its way through the condenser coil more and more heat is removed and the refrigerant vapor changes state from a refrigerant vapor to a refrigerant liquid. While the liquid refrigerant changes temperatures from a higher temperature to a slightly lower temperature the pressure remains constant. As the refrigerant vapor leaves the condenser coil it makes it way to the metering device. (more…)
Variable Speed ECM Condenser Fan Motors are used in condensers for the high efficient models so that the fan speed for the condenser can be modulated according to the load of the system. The ECM variable speed fan motors are used in condensers that have a modulating compressor. They are also used in condensers that have two compressors or a two-stage compressor. The ECM motor adds to the efficiency of the system by modulating the condenser fan motor. The speed matches the compressor that runs based on demand. (more…)
Glycol Feed System for Chiller Condenser Water Loop
Glycol is like antifreeze and is used in chilled water piping loops to prevent freezing. Everyone knows when the pipes freeze they also break and start leaking. Having antifreeze in a chilled water loop is important to prevent freezing. So, how do you keep antifreeze in the loop when the water/glycol mix goes out to the cooling tower and there is a loss of water/glycol through windage or drift? Meet the glycol make-up unit where it can automatically be added to the loop and prevent freezing. Antifreeze make-up units range from automatic units that will inject the antifreeze right into the loop to manual units that require an operator to control the process of adding antifreeze to the water loop. These make-up units make it easy to add it to the loop without having a shut-down of the chilled water loop it serves so the loop can continue to run while the glycol is injected directly into the loop. The loops are designed to work at low ambient temperatures need the water/glycol mix to prevent freezing especially for critical facilities like data centers that need to remain operation no matter what the outside temperature conditions are. Percent of antifreeze to water depends on the expected operational temperatures outside so the mix is important for expected operating temperatures. An example of this is listed in the following table (follow equipment manufactures instructions for the recommended mix of antifreeze to water for temperatures):. Each loop requires a different ratio of mix based on ambient conditions, flow rates and other factors for determining the proper mix ratios.
Glycol Feed System for Chiller Condenser Water Loop | Antifreeze Protection – Percentage Water to Temperature Ratio
Propylene Glycol% to Water
How a Programmable Thermostats Works – Programmable thermostats can save you more than ten percent on your homes utility bills. For that reason a programmable can pay for itself within a few years depending on the type and expense of the type you purchase. I always lean towards Honeywell thermostats simply because I’ve seen their reliability in the field and sometimes ease of use. Among others, you can expect good quality from Honeywell thermostat products. The new, hi-tech style currently out on the market is the Honeywell touch-screen thermostat.
The NEC and HVAC Chapter Two – Chapter Two of the National Electrical Code (NEC) covers Wiring and Protection and starts at Branch Circuits, Feeder circuits, GFCI requirements and protection,. An HVAC installer may want to pay attention to branch circuit requirements. Article 220 in Chapter two of the NEC includes calculations for branch and feeder circuits including service calculations. (Table 220.3) (more…)
Critical Facilities and Make-up Water
Data Centers a categorized by tier levels and everything in the data centers infrastructure is checked and classified so that any particular data center can achieve a certain tier level based on the infrastructure in the data center. Data centers are always classified a critical facilities and need the proper infrastructure to maintain a critical level of performance to minimize any downtime that may occur as a result of a failure in one of the data centers systems or a failure of any utility serving a data center. HVAC Mechanical and electrical systems are redundant in most data center facilities and are scrutinized for dependability and reliability. A data center can have two chiller plants (one redundant) but what happens if the data center relies only on one source for the make-up water for those chiller plants? Say a local municipality supplies the water used for make-up water. What happens if the main breaks in the middle of the summer when demand for make-up water is high? A redundant chiller plant is no good if the cooling towers do not have water to keep the condenser water cool. Data centers therefore typically have backup sources for make-up water like a well system or even make-up water tanks that will carry the data center a few days until the utility can be restored.
This Goodman 13 SEER Heat Pump condensing unit is a new installation. The inside Goodman air handler attached to the heat pump condenser via line set was also replaced with this new Goodman heat pump. Its not a good idea to put a new high SEER air conditioner or heat pump condenser without matching it up with a properly rated and efficient air handler especially the coil. In 2006 congress mandated new efficiency levels for split system air conditioners from 10 SEER to 13 SEER. HVAC Manufacturers could no longer sell 10 SEER split system air conditioners or heat pumps to the general public. As a result homeowners were forced to purchase HVAC Equipment that was more efficient which of course costs more to manufacture. Additionally, in the past HVAC contractors could change the condenser if the condenser went bad. The HVAC Contractor could hook up a new condenser to an older air handler before this rule took effect. After the new rule took effect in 2006 the HVAC contractors had no choice but to replace the condensing unit and the air handler as the the older systems rarely matched the newer systems. (more…)
Air Management in Hydronic Piping Loops
This is a secondary chilled water pump in a large pump room designated for pumps and piping in a data center. After a few minor tweaks and corrections these pumps all operated flawlessly. There was very little issues with the secondary pump start-ups unlike the primary pumps where cavitation was encountered on the primary chilled water pumps and the condenser water pumps for the chiller. The diagnosis for the cavitation of the primary pumps and the condenser water pumps was that the loops were not properly purged and this caused those pumps to cavitate. The secondary pumps, pictured here, did not have that problem giving kudos to the team that purged the loops on this side of the chilled water system. (more…)
About Chilled Water Systems | HVAC Hydronics
About Chilled Water Systems –
Old York Chiller
Chilled water systems are mainly used in large commercial HVAC air conditioning systems and industrial cooling applications although there are some residential and light commercial HVAC chilled water systems in use. Chilled water systems are popular because they use water as a refrigerant. Water is far less expensive than refrigerant. This makes them cost effective especially in commercial HVAC air conditioning applications. Instead of running refrigerant lines over a large area of the building water pipes are ran throughout the building and to evaporator coils in air handlers for HVAC air conditioning systems. The chilled water is pumped through these pipes from a chiller where the evaporator coil absorbs heat and returns it to the chiller to reject the heat.